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Freightliner Business Class M2 Fault Codes List - ABS | Truckmanualshub.com (1)

Freightliner Business Class M2

ABS Fault Codes PDF

Freightliner Business Class M2 Fault Codes List – ABS System Troubleshooting

Meritor WABCO Pneumatic Antilock Braking System (ABS) – Table of DTCs

Left Front Wheel Sensor Troubleshooting (SID 001)
MIDSIDFMIProblemTestTest ResultAction
13600101Incorrect sensor air gap1. Adjust the sensor. Check the AC voltage across pins 7 and 8 of the black X2 ECU connector while rotating the LF wheel 30 rpm.Voltage is 0.2 Vac or greaterSensor adjustment solved the problem.
Voltage is less than 0.2 VacCheck for excessive wheel bearing end play and hub runout. Repair as needed.
13600102Incorrect tire sizeCheck for correct tire size and mixed tire sizes. Check for correct number of teeth on tone wheel.

Correct as needed.

13600103Sensor shorted to power2. Measure the voltage across pins 7 of the X2 (black) connector and a good chassis ground. Repeat the test between pin 8 and ground.Measurable voltage at either pinRepair short to power in circuit(s) 377LF+ and 377LF– in chassis harness and sensor cable.

If problem is in the sensor harness, replace the sensor.

No voltage at either pinRepeat the test and check for intermittent short to power in circuits 377LF+ and 377LF–.

Suspect ECU is at fault if the problem persists.

Left Front Wheel Sensor Troubleshooting (SID 001)
MIDSIDFMIProblemTestTest ResultAction
13600104Short to ground3. Measure the resistance between pin 7 of the X2 (black) connector and a good chassis ground. Repeat the test between pin 8 and ground.Resistance between either pin and ground is less than 100,000 ohmsRepair the short to ground in circuit(s) 377LF+ and 377LF– in chassis harness or sensor cable.

If problem is in sensor harness, replace the sensor.

Resistance between either pin and ground is greater than 100,000 ohmsRepeat the test for intermittent short to ground in circuits 377LF+ and 377LF–.

Suspect ECU is at fault if the problem persists.

13600105Open circuit4. Measure the resistance between pins 7u and 8 of the X2 (black) connector.Resistance is 900–

2000 ohms

Repeat the test and check for intermittent open or short in circuits 377LF+ and 377LF–.

Suspect ECU at fault if the problem persists.

Resistance is greater than 2000 ohms OR less than 900 ohm.Perform test 5.
13600105Open circuit5. Disconnect the sensor connector from the chassis harness. Measure the resistance between the pins on the sensor connector.Resistance is 900–

2000 ohms

Repair open or short in circuit(s) 377LF+ and 377LF– in chassis harness.
Resistance is greater than 2000 ohms OR less than 900 ohmsReplace the sensor.
13600106Short circuitPerform tests 4 and 5.
13600107Damaged tone ringInspect tone ring for damage and missing teeth. Make sure correct tooth wheel is installed (100-tooth is normal application). Repair as needed.
13600108Excessive wheel slipCheck sensor adjustment. This fault usually occurs when there is excessive tire spin for more than 16 seconds.
13600109Wire mismatch6. Check for mixed sensor connection. Using Meritor PC Diagnostics, spin each wheel individually. Check that output is from the correct sensor.Correct wiring connections, as needed.
Left Front Wheel Sensor Troubleshooting (SID 001)
MIDSIDFMIProblemTestTest ResultAction
13600110Intermittent signal7. Adjust the sensor. Using the wheel sensor output screen in Meritor PC Diagnostics, spin the wheel or drive the vehicle and check for intermittent or erratic signal.Signal output OKAdjustment solved the problem. Make sure brake chatter is not causing the problem.
Signal output incorrectCheck for intermittent wheel sensor circuit connections. Cause could be due to brake chatter.

Repair as needed.

13600111Erratic signalPerform test 7.
13600112Frequency too high8. Check sensor wiring and connectors for intermittent contact.Wiring OKSuspect ECU at fault if problem persists.
Wiring incorrectRepair wheel sensor circuit, as needed.
Right Front Wheel Sensor Troubleshooting (SID 002)
MIDSIDFMIProblemTestTest ResultAction
13600201Incorrect sensor air gap1. Adjust the sensor. Check the AC voltage across pins 5 and 6 of the black X2 ECU connector while rotating the RF wheel 30 rpm.Voltage is 0.2 Vac or greaterSensor adjustment solved the problem.
Voltage is less than 0.2 VacCheck for excessive wheel bearing end play and hub runout. Repair as needed.
13600202Incorrect tire sizeCheck for correct tire size and mixed tire sizes. Check for correct number of teeth on tone wheel.

Correct as needed.

13600203Sensor shorted to power2. Measure the voltage across pin 5 of the X2 (black) connector and a good chassis ground. Repeat the test between pin 8 and ground.Measurable voltage at either pinRepair short to power in circuit(s) 377RF+ and 377RF– in chassis harness and sensor cable.

If problem is in the sensor harness, replace the sensor.

No voltage at either pinRepeat the test and check for intermittent short to power in circuits 377RF+ and 377RF–.

Suspect ECU is at fault if the problem persists.

Right Front Wheel Sensor Troubleshooting (SID 002)
MIDSIDFMIProblemTestTest ResultAction
13600204Short to ground3. Measure the resistance between pin 5 of the X2 (black) connector and a good chassis ground. Repeat the test between pin 6 and ground.Resistance between either pin and ground is less than 100,000 ohmsRepair the short to ground in circuit(s) 377RF+ and 377RF– in chassis harness or sensor cable.

If problem is in sensor harness, replace the sensor.

Resistance between either pin and ground is greater than 100,000 ohmsRepeat the test for intermittent short to ground in circuits 377RF+ and 377RF–.

Suspect ECU is at fault if the problem persists.

13600205Open circuit4. Measure the resistance between pins 5 and 6 of the X2 (black) connector.Resistance is 900–

2000 ohms

Repeat the test and check for intermittent open or short in circuits 377RF+ and 377RF–.

Suspect ECU at fault if the problem persists.

Resistance is greater than 2000 ohms OR less than 900 ohm.Perform test 5.
5. Disconnect the sensor connector from the chassis harness. Measure the resistance between the pins on the sensor connector.Resistance is 900–

2000 ohms

Repair open or short in circuit(s) 377RF+ and 377RF– in chassis harness.
Resistance is greater than 2000 ohms OR less than 900 ohmsReplace the sensor.
13600206Short circuitPerform tests 4 and 5.
13600207Damaged tone ringInspect tone ring for damage and missing teeth. Make sure correct tooth wheel is installed (100-tooth is normal application). Repair as needed.
13600208Excessive wheel slipCheck sensor adjustment. This fault usually occurs when there is excessive tire spin for more than 16 seconds.
13600209Wire mismatch6. Check for mixed sensor connection. Using Meritor PC Diagnostics, spin each wheel individually. Check that output is from the correct sensor.Correct wiring connections, as needed.
Right Front Wheel Sensor Troubleshooting (SID 002)
MIDSIDFMIProblemTestTest ResultAction
13600210Intermittent signal7. Adjust the sensor. Using the wheel sensor output screen in Meritor PC Diagnostics, spin the wheel or drive the vehicle and check for intermittent or erratic signal.Signal output OKAdjustment solved the problem. Make sure brake chatter is not causing the problem.
Signal output incorrectCheck for intermittent wheel sensor circuit connections. Cause could be due to brake chatter.

Repair as needed.

13600211Erratic signalPerform test 7.
13600212Frequency too high8. Check sensor wiring and connectors for intermittent contact.Wiring OKSuspect ECU at fault if problem persists.
Wiring incorrectRepair wheel sensor circuit, as needed.
Left Rear Wheel Sensor Troubleshooting (SID 003)
MIDSIDFMIProblemTestTest ResultAction
13600301Incorrect sensor air gap1. Adjust the sensor. Check the AC voltage across pins 1 and 2 of the black X2 ECU connector while rotating the LR wheel 30 rpm.Voltage is 0.2 Vac or greaterSensor adjustment solved the problem.
Voltage is less than 0.2 VacCheck for excessive wheel bearing end play and hub runout. Repair as needed.
13600302Incorrect tire sizeCheck for correct tire size and mixed tire sizes. Check for correct number of teeth on tone wheel.

Correct as needed.

13600303Sensor shorted to power2. Measure the voltage across pin 1 of the X3 (green) connector and a good chassis ground. Repeat the test between pin 2 and ground.Measurable voltage at either pinRepair short to power in circuit(s) 377LR+ and 377LR– in chassis harness and sensor cable.

If problem is in the sensor harness, replace the sensor.

No voltage at either pinRepeat the test and check for intermittent short to power in circuits 377LR+ and 377LR–.

Suspect ECU is at fault if the problem persists.

Left Rear Wheel Sensor Troubleshooting (SID 003)
MIDSIDFMIProblemTestTest ResultAction
13600304Short to ground3. Measure the resistance between pin 1 of the X3 (green) connector and a good chassis ground. Repeat the test between pin 2 and ground.Resistance between either pin and ground is less than 100,000 ohmsRepair the short to ground in circuit(s) 377LR+ and 377LR– in chassis harness or sensor cable.

If problem is in sensor harness, replace the sensor.

Resistance between either pin and ground is greater than 100,000 ohmsRepeat the test for intermittent short to ground in circuits 377LR+ and 377LR–.

Suspect ECU is at fault if the problem persists.

13600305Open circuit4. Measure the resistance between pins 1 and 2 of the X3 (green) connector.Resistance is 900–

2000 ohms

Repeat the test and check for intermittent open or short in circuits 377LR+ and 377LR–.

Suspect ECU at fault if the problem persists.

Resistance is greater than 2000 ohms OR less than 900 ohm.Perform test 5.
5. Disconnect the sensor connector from the chassis harness. Measure the resistance between the pins on the sensor connector.Resistance is 900–

2000 ohms

Repair open or short in circuit(s) 377LR+ and 377LR– in chassis harness.
Resistance is greater than 2000 ohms OR less than 900 ohmsReplace the sensor.
13600306Short circuitPerform tests 4 and 5.
13600307Damaged tone ringInspect tone ring for damage and missing teeth. Make sure correct tooth wheel is installed (100-tooth is normal application). Repair as needed.
13600308Excessive wheel slipCheck sensor adjustment. This fault usually occurs when there is excessive tire spin for more than 16 seconds.
13600309Wire mismatch6. Check for mixed sensor connection. Using Meritor PC Diagnostics, spin each wheel individually. Check that output is from the correct sensor.Correct wiring connections, as needed.
Left Rear Wheel Sensor Troubleshooting (SID 003)
MIDSIDFMIProblemTestTest ResultAction
13600310Intermittent signal7. Adjust the sensor. Using the wheel sensor output screen in Meritor PC Diagnostics, spin the wheel or drive the vehicle and check for intermittent or erratic signal.Signal output OKAdjustment solved the problem. Make sure brake chatter is not causing the problem.
Signal output incorrectCheck for intermittent wheel sensor circuit connections. Cause could be due to brake chatter.

Repair as needed.

13600311Erratic signalPerform test 7.
13600312Frequency too high8. Check sensor wiring and connectors for intermittent contact.Wiring OKSuspect ECU at fault if problem persists.
Wiring incorrectRepair wheel sensor circuit, as needed.
Right Rear Wheel Sensor Troubleshooting (SID 004)
MIDSIDFMIProblemTestTest ResultAction
13600401Incorrect sensor air gap1. Adjust the sensor. Check the AC voltage across pins 3 and 4 of the black X2 ECU connector while rotating the RR wheel 30 rpm.Voltage is 0.2 VAC or greaterSensor adjustment solved the problem.
Voltage is less than 0.2 VACCheck for excessive wheel bearing end play and hub runout. Repair as needed.
13600402Incorrect tire sizeCheck for correct tire size and mixed tire sizes. Check for correct number of teeth on tone wheel.

Correct as needed.

13600403Sensor shorted to power2. Measure the voltage across pin 3 of the X3 (green) connector and a good chassis ground. Repeat the test between pin 4 and ground.Measurable voltage at either pinRepair short to power in circuit(s) 377RR+ and 377RR– in chassis harness and sensor cable.

If problem is in the sensor harness, replace the sensor.

No voltage at either pinRepeat the test and check for intermittent short to power in circuits 377RR+ and 377RR–.

Suspect ECU is at fault if the problem persists.

Right Rear Wheel Sensor Troubleshooting (SID 004)
MIDSIDFMIProblemTestTest ResultAction
13600404Short to ground3. Measure the resistance between pin 3 of the X3 (green) connector and a good chassis ground. Repeat the test between pin 4 and ground.Resistance between either pin and ground is less than 100,000 ohmsRepair the short to ground in circuit(s) 377RR+ and 377RR– in chassis harness or sensor cable.

If problem is in sensor harness, replace the sensor.

Resistance between either pin and ground is greater than 100,000 ohmsRepeat the test for intermittent short to ground in circuits 377RR+ and 377RR–.

Suspect ECU is at fault if the problem persists.

13600405Open circuit4. Measure the resistance between pins 3 and 4 of the X3 (green) connector.Resistance is 900–

2000 ohms

Repeat the test and check for intermittent open or short in circuits 377RR+ and 377RR–.

Suspect ECU at fault if the problem persists.

Resistance is greater than 2000 ohms OR less than 900 ohm.Perform test 5.
5. Disconnect the sensor connector from the chassis harness. Measure the resistance between the pins on the sensor connector.Resistance is 900–

2000 ohms

Repair open or short in circuit(s) 377RR+ and 377RR– in chassis harness.
Resistance is greater than 2000 ohms OR less than 900 ohmsReplace the sensor.
13600406Short circuitPerform tests 4 and 5.
13600407Damaged tone ringInspect tone ring for damage and missing teeth. Make sure correct tooth wheel is installed (100-tooth is normal application). Repair as needed.
13600408Excessive wheel slipCheck sensor adjustment. This fault usually occurs when there is excessive tire spin for more than 16 seconds.
13600409Wire mismatch6. Check for mixed sensor connection. Using Meritor PC Diagnostics, spin each wheel individually. Check that output is from the correct sensor.Correct wiring connections, as needed.
Right Rear Wheel Sensor Troubleshooting (SID 004)
MIDSIDFMIProblemTestTest ResultAction
13600410Intermittent signal7. Adjust the sensor. Using the wheel sensor output screen in Meritor PC Diagnostics, spin the wheel or drive the vehicle and check for intermittent or erratic signal.Signal output OKAdjustment solved the problem. Make sure brake chatter is not causing the problem.
Signal output incorrectCheck for intermittent wheel sensor circuit connections. Cause could be due to brake chatter.

Repair as needed.

13600411Erratic signalPerform test 7.
13600412Frequency too high8. Check sensor wiring and connectors for intermittent contact.Wiring OKSuspect ECU at fault if problem persists.
Wiring incorrectRepair wheel sensor circuit, as needed.
Left Front Modulator Valve Troubleshooting (SID 007)
MIDSIDFMIProblemTestTest ResultAction
13600703Short to power

Inlet or outlet circuit shorted to battery supply or another modulator valve wire.

1. Measure the voltage between pins 2, 10, and 11 of the X2 (black) connector and a good chassis ground.No voltage at either pinRepeat test. Check circuits 378LFI, 378LFO, and 378LF– for

intermittent short to power. Check above circuits for shorts to other modulator valve wires. Repair as necessary.

If problem persists, the suspect ECU is at fault.

Measurable voltage at either pinRepair short to power in circuit 378LFI, 378LFO, or 378LF–.
13600705Open circuit

Inlet or outlet circuit open.

2. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve resistance test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378LFI, 378LFO, or 378LF–.
Resistance in both circuits is not within 4 to 8 ohms.Replace the modulator valve.
13600706Short to ground

Inlet or outlet circuit shorted to ground.

3. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378LFI, 378LFO, or 378LF– for

short to ground. Repair as necessary.

Resistance in both circuits is not within 4 to 8 ohms.Replace modulator valve.
Right Front Modulator Valve Troubleshooting (SID 008)
MIDSIDFMIProblemTestTest ResultAction
13600803Short to power

Inlet or outlet circuit shorted to battery supply or another modulator valve wire.

1. Measure the voltage between pins 3, 4, and 9 of the X2 (black) connector and a good chassis ground.No voltage at either pinRepeat test. Check circuits 378RFO, 378RFI, and 378RF– for

intermittent short to power. Check above circuits for shorts to other modulator valve wires. Repair as necessary.

If problem persists, the suspect ECU is at fault.
Measurable voltage at either pinRepair short to power in circuit 378RFO, 378RFI, or 378RF–.
13600805Open circuit

Inlet or outlet circuit open.

2. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve resistance test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378RFO, 378RFI, or 378RF–.
Resistance in both circuits is not within 4 to 8 ohms.Replace the modulator valve.
13600806Short to ground

Inlet or outlet circuit shorted to ground.

3. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378RFO, 378RFI, or 378RF– for

short to ground. Repair as necessary.

Resistance in both circuits is not within 4 to 8 ohms.Replace modulator valve.
Left Rear Modulator Valve Troubleshooting (SID 009)
MIDSIDFMIProblemTestTest ResultAction
13600903Short to power

Inlet or outlet circuit shorted to battery supply or another modulator valve wire.

1. Measure the voltage between pins 10, 11, and 12 of the X3 (green) connector and a good chassis ground.No voltage at either pinRepeat test. Check circuits 378LRI, 378LRO, and 378LR– for

intermittent short to power. Check above circuits for shorts to other modulator valve wires. Repair as necessary.

If problem persists, the suspect ECU is at fault.

Measurable voltage at either pinRepair short to power in circuit 378LRI, 378LRO, or 378LR–.
13600905Open circuit

Inlet or outlet circuit open.

2. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve resistance test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378LRI, 378LRO, and 378LR–.
Resistance in both circuits is not within 4 to 8 ohms.Replace the modulator valve.
Left Rear Modulator Valve Troubleshooting (SID 009)
MIDSIDFMIProblemTestTest ResultAction
13600906Short to ground

Inlet or outlet circuit shorted to ground.

3. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378LRI, 378LRO, and 378LR– for

short to ground. Repair as necessary.

Resistance in both circuits is not within 4 to 8 ohms.Replace modulator valve.
Right Rear Modulator Valve Troubleshooting (SID 010)
MIDSIDFMIProblemTestTest ResultAction
13601003Short to power

Inlet or outlet circuit shorted to battery supply or another modulator valve wire.

1. Measure the voltage between pins 7, 8, and 9 of the X3 (green) connector and a good chassis ground.No voltage at either pinRepeat test. Check circuits 378RRO, 378RR–, and 378RRI

for intermittent short to power. Check above circuits for shorts to other modulator valve wires.

Repair as necessary.

If problem persists, the suspect ECU is at fault.
Measurable voltage at either pinRepair short to power in circuit 378RRO, 378RR–, or 378RRI.
13601005Open circuit

Inlet or outlet circuit open.

2. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378RRO, 378RRI, and 378RR–.
Resistance in both circuits is not within 4 to 8 ohms.Replace the modulator valve.
13601006Short to ground

Inlet or outlet circuit shorted to ground.

3. Check the modulator valve inlet and outlet circuit resistance. Disconnect the connector from the valve and perform the modulator valve test.Resistance in both circuits is within 4 to 8 ohms.Check harness wiring circuits 378RRI, 378RRO, and 378RR–

for short to ground. Repair as necessary.

Resistance in both circuits is not within 4 to 8 ohms.Replace modulator valve.
Ground Faults Troubleshooting (SID 014)
MIDSIDFMIProblemTestTest ResultAction
13601404Low voltage or open circuit1. Disconnect the X1 (gray) connector at the ABS ECU. With the ignition ON, measure the voltage between pins 1 and 12.Voltage is 9.5 to 14 volts.System voltage is acceptable. Check for intermittent low voltage. Check the batteries and charging system. Voltage may have been temporarily too low. Repair as necessary.
Voltage is less than 9.5 volts.Check vehicle batteries and charging system. Check ABS ECU power and ground circuits for open or high resistance.

Repair as necessary.

13601405Central group open or high resistance2. Disconnect the X1 (gray) connector at the ABS ECU. Check the ground circuit (pin 11) for high resistance or open circuit.Ground is okayVerify the fault. Check the ground circuits for open or high resistance. Repair as necessary.
Ground is open or has high resistanceRepair ground circuit as necessary.
13601406Internal relay does not openIf fault repeats, replace the ABS ECU.
Ground Faults Troubleshooting (SID 015)
MIDSIDFMIProblemTestTest ResultAction
13601503ATC valve grounded to power.1. Disconnect the X3 (green) connector, check for voltage between pin 6 and ground.Voltage at pin 6.Circuit 378T- is shorted to power. Locate fault and repair as necessary.
No voltage at pin 6.Verify fault. Check for intermittent fault in circuit 378-, repair as necessary.
13601504Low voltage or open circuit2. Disconnect the X1 (gray) connector at the ABS ECU. With the ignition ON, measure the voltage between pin 2 and a good ground.Voltage is 9.5 to 14 voltsSystem voltage is acceptable. Check for intermittent low voltage. Check the batteries and charging system. Voltage may have been temporarily too low. Repair as necessary.
Voltage is less than 9.5 voltsRepair voltage supply to ECU.
13601505ATC Valve – High ImpedanceReplace ABS ECU if fault persists.
06ATC Valve circuit shorted to groundDisconnect the X3 (green) connector, check resistance between pin 6 and a good ground.Resistance is less than 10,000 ohmsVerify fault. Check for intermittent fault in circuit 378-, repair as necessary.
Resistance is great than 10,000 ohmsVerify fault. Check for intermittent fault in circuit 378T-, repair as necessary.
Ground Faults Troubleshooting (SID 015)
MIDSIDFMIProblemTestTest ResultAction
13601507Internal relay faultIf fault repeats, replace the ABS ECU.
ATC Valve Troubleshooting (SID 018)
MIDSIDFMIProblemTestTest ResultAction
13601803Short to power.1. Disconnect the X3 (green) connector from the ABS ECU. Disconnect the ATC valve connector. Measure the voltage between pin 5 of the X3 (green) connector and a good chassis harness.VoltageCircuit 378T+ is shorted to power. Repair as necessary.
No voltageCheck circuit 378+ for intermittent short to power. Repair as necessary. If fault persists, suspect ECU at fault.
13601805Open circuit2. Disconnect the ATC Valve connector. Measure the resistance across the two pins of the ATC valve.

NOTE If the vehicle does not have an ATC valve, reconfigure the ECU.

Resistance is 7 to 14 ohms.Go to step 3.
Resistance is not 7 to 14 ohms.Replace ATC Valve.
3. Reconnect the ATC valve connector. Measure the resistance across pins 5 and 6 of the X3 connector.Resistance is 7 to 14 ohms.Verify fault. Check for intermittent open circuit in 376T+ and 376 T-. Repair as necessary.
Resistance is not 7 to 14 ohms.Repair circuit 376T+ or 376T-.
13601807Short to ground.4. Disconnect the X3 (green) connector, check resistance between pin 6 and a good ground.ContinuityCircuit 376T+ is shorted to ground. Repair as necessary.
No continuityVerify fault. Check circuit 376T+ for intermittent short to ground. Repair as necessary.
Auxiliary Output Troubleshooting (not currently used) (SID 019)
MIDSIDFMIProblemTestTest ResultAction
13601903Short to power.This fault should not appear. Re- configure the ECU. If fault continues to appear, check the wiring in the X2 (black) connector. This ABS ECU connector should be unused. Make sure there are no connections to these pins. If incorrect wiring is found, correct it and reconfigure the ECU. If this does not correct the problem, contact Meritor.
13601905Open circuitVerify fault. Contact Meritor WABCO if fault persists.
13601906Short to groundThis fault should not appear. Reconfigure the ECU. If fault continues to appear, check the wiring in the X2 (black) connector. This ABS ECU connector should be unused. Make sure there are no connections to these pins. If incorrect wiring is found, correct it and reconfigure the ECU. If this does not correct the problem, contact Meritor.
J1939 Datalink Troubleshooting (SID 231)
MIDSIDFMIProblemTestTest ResultAction
13623102J1939 speed plausibility error.

NOTE: This fault indicates a discrepancy between vehicle speed reported on J1939 and ABS sensed vehicle speed.

Check the speedometer calibration. Check for the tire size mismatch. The vehicle speed reported on the J1939 databus does not agree with the wheel sensor speeds.
13623105J1939 open/shortRefer to SB 54-133 for troubleshooting J1939.Repair J1939 datalink as necessary.
13623106J1939 open/short

Code 13s231 05 may be active as well.

Check the driveline retarder ECU and wires. Check the J1939 Datalink.

Freightliner SB 54-133

Repair J1939 datalink as necessary.
J1939 Datalink Troubleshooting (SID 231)
MIDSIDFMIProblemTestTest ResultAction
13623107J1939 time out

NOTE: Fault occurs if engine retarder sends message incorrectly.

Check the driveline retarder ECU and wires.

Freightliner SB 54-133

Check J1939 datalink and driveline retarder ECU. Repair as necessary.
13623108J1939 time out

NOTE: Fault occurs if engine retarder sends message incorrectly.

Check engine ECU and wires. Check J1939 datalink.

Freightliner SB 54-133

Check J1939 datalink and engine ECU. Repair as necessary.
13623109J1939 time out

NOTE: Fault occurs if engine retarder sends message incorrectly.

Check engine and transmission ECUs and wires. Check J1939 datalink.

Freightliner SB 54-133

Check J1939 datalink, engine ECU, transmission ECU, and wiring. Repair as necessary.
13623110J1939 time out

NOTE: Fault occurs if the exhaust retarder sends a message incorrectly.

Check the engine ECU and wires. Check the J1939 datalink.

Freightliner SB 54-133

Check J1939 datalink and engine ECU. Repair as necessary.
13623112J1939 internal errorVerify fault. Clear code from the ECU memory. If fault persists, replace the ABS ECU.
Voltage Troubleshooting (SID 251)
MIDSIDFMIProblemTestTest ResultAction
13625103Overvoltage

Voltage to ECU was too high for more than 5 seconds.

Using Meritor PC Diagnostics, check the diagonal voltages with the engine running at governed speed, or measure the voltage at the batteries with the engine running at governed speed.Voltage is 9.5 to 14 voltsCheck for intermittent sources of high voltage. Check condition of charging system and batteries. Verify fault.
Voltage is greater than 14 volts.Check charging system. Repair as necessary.
Configuration Errors Troubleshooting (SID 253)
MIDSIDFMIProblemTestTest ResultAction
13625301ATC configuration error

NOTE: ATC valve is detected without engine datalink (J1939).

Check J1939 for proper wiring. Check engine ECU for communication. Repair as necessary, then reconfigure ECU.
13625302ABS

configuration/ wheel parameter incorrect.

Reconfigure ECU. If fault repeats then the wrong ECU is installed. Replace with the correct ECU.
13625312Check sum error.Check parameter setting. Check if diagnostic device was disconnected during active diagnosis.
Miscellaneous Faults Troubleshooting (SID 254)
MIDSIDFMIProblemTestTest ResultAction
13625405ABS/ATC ECU,

no loads

No modulator valve connected. Fault may have resulted from end of line test at factory.
13625408Excessive wheel slip.Check wheel speed sensor air gaps. One wheel was much faster than the other. May have been caused by testing vehicle on a dynamometer.
13625409Modulator valve actuated too long.Modulator valve was activated too long (more than 75% of 5 minutes). After a delay, function will return to normal.
13625412Internal errorIf fault persists, replace the ABS ECU.
13625413Accelerometer out of rangeIf fault persists, replace the ABS ECU.
Miscellaneous Faults Troubleshooting (SID 254)
MIDSIDFMIProblemTestTest ResultAction
13625414ECU MountingCheck ECU mounting. Replace

the ECU if fault persists.

Extreme banked road (measured acceleration not plausible)No correction required. This fault is for reporting only.
Accelerometer linearity

(measured acceleration not plausible)

Meritor WABCO Hydraulic Antilock Braking System (ABS) – Table of DTCs

Fault Codes

J1587 Fault Code (MID-SID)Description
136-001Left Front Wheel Sensor *
136-002Right Front Wheel Sensor
136-003Left Rear Wheel Sensor
136-004Right Rear Wheel Sensor
136-013Retarder
136-014Power
136-023ABS Warning Light
136-030Recirculation Pump Relay
136-042Left Front Inlet Solenoid Valve
136-043Right Front Inlet Solenoid Valve
136-044Left Rear Inlet Solenoid Valve
136-045Right Rear Inlet Solenoid Valve
136-048Left Front Outlet Solenoid Valve
136-049Right Front Outlet Solenoid Valve
136-050Left Rear Outlet Solenoid Valve
136-051Right Rear Outlet Solenoid Valve
136-054Recirculation Pump
136-055ECU
136-251Low Voltage
136-253Internal Tire Parameter
136-254ECU Internal Fault

* Blink codes 5-1, 5-3 and 5-4 indicate a fault with the right front, right rear and left rear wheel sensors respectively.

Troubleshooting Tables

J1587 Fault 136-001 Left Front Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

001

01

Incorrect sensor air gap

1. Adjust the sensor. Check the AC voltage across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF+ and 377 LF–) while rotating the left front wheel 30 rpm.

Voltage greater than 0.2 VAC

Sensor adjustment solved the problem. Clear the stored faults and drive the vehicle 4 mph (6 km/h).
Voltage less than 0.2 VACCheck for excessive wheel bearing end play. Repair as necessary.
J1587 Fault 136-001 Left Front Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

001

02

Intermittent open circuit or incorrect sensor resistance

NOTE: This SAE J1587

fault code can also be caused by incorrect or mixed tire size. Also see test 4.

2. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377 LF+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377LF+ and 377LF– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 3.

3. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). Repair as necessary. Go to Test 4.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

136

001

02

Incorrect or mixed tire size NOTE: This SAE J1587

fault code can also be caused by an intermittent open circuit or incorrect sensor resistance. Also, see tests 2 and 3.

4. Check for tire size deviation in excess of 16 percent. Mixed tire sizes can cause this fault.

Correct tire size and size variation does not exceed 16 percentPerform Test 2 and Test 3 if not already done. If the problem is not found, verify the fault and check the ECU.
Incorrect tire size or size variation exceeds 16 percent

Install the correct size tires.

J1587 Fault 136-001 Left Front Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

001

05

Open circuit

5. Measure the resistance across Pins 5 and 8 of the green X3 ECU connector (Circuits 377LF– and 377LF+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377LF+ and 377LF– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 6.

6. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377LF+ and 377LF–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

J1587 Fault 136-002 Right Front Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

002

01

Incorrect sensor air gap

1. Adjust the sensor. Check the AC voltage across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF+ and 377RF–) while rotating the right front wheel 30 rpm.

Voltage greater than 0.2 VAC

Sensor adjustment solved the problem. Clear the stored faults and drive the vehicle 4 mph (6 km/h).
Voltage less than 0.2 VACCheck for excessive wheel bearing end play. Repair as necessary.
J1587 Fault 136-002 Right Front Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

002

02

Intermittent open circuit or incorrect sensor resistance

2. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 3.

3. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377RF+ and 377RF–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

136

002

05

Open circuit

4. Measure the resistance across Pins 4 and 9 of the green X3 ECU connector (Circuits 377RF– and 377RF+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377RF+ and 377RF– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 5.

5. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377RF+ and 377RF–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

J1587 Fault 136-003 Left Rear Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

003

01

Incorrect sensor air gap

1. Adjust the sensor. Check the AC voltage across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR+ and 377LR–) while rotating the left rear wheel 30 rpm.

Voltage greater than 0.2 VAC

Sensor adjustment solved the problem. Clear the stored faults and drive the vehicle 4 mph (6 km/h).
Voltage less than 0.2 VACCheck for excessive wheel bearing end play. Repair as necessary.

136

003

02

Intermittent open circuit or incorrect sensor resistance

2. Measure the resistance across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR– and 377LR+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377LR+ and 377LR– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 3.

3. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377LR+ and 377LR–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

136

003

05

Open circuit

4. Measure the resistance across Pins 3 and 10 of the green X3 ECU connector (Circuits 377LR– and 377LR+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377LR+ and 377LR– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 5.

5. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377LR+ and 377LR–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

J1587 Fault 136-004 Right Rear Wheel Sensor
MIDSIDFMIProblemTestTest ResultAction

136

004

01

Incorrect sensor air gap

1. Adjust the sensor. Check the AC voltage across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR+ and 377RR–) while rotating the right rear wheel 30 rpm.

Voltage greater than 0.2 VAC

Sensor adjustment solved the problem. Clear the stored faults and drive the vehicle 4 mph (6 km/h).
Voltage less than 0.2 VACCheck for excessive wheel bearing end play. Repair as necessary.

136

004

02

Intermittent open circuit or incorrect sensor resistance

2. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377RR+ and 377RR– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 3.

3. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377RR+ and 377RR–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

136

004

05

Open circuit

4. Measure the resistance across Pins 6 and 7 of the green X3 ECU connector (Circuits 377RR– and 377RR+).

Resistance reading between 500 and 2000 ohms

Check for intermittent, loose or poor connections in Circuits 377RR+ and 377RR– and repair as necessary. If the problem persists, suspect the ECU is at fault.
Resistance reading below 500 or above

2000 ohms

Go to Test 5.

5. Disconnect the sensor at the sensor connector. Measure the resistance at the sensor connector (on the sensor side).

Resistance reading between 500 and 2000 ohmsCheck the wiring between the ECU and the wheel sensor (Circuits 377RR+ and 377RR–). Repair as necessary.
Resistance reading below 500 or above

2000 ohms

Replace the wheel sensor.

J1587 Fault 136-013 Retarder
MIDSIDFMIProblemTestTest ResultAction

136

013

03

Short to power

1. Disconnect the black X2 connector at the ECU. Disconnect the retarder relay. With the ignition ON, measure the voltage between Pin 7 of the black X2 ECU connector and a good chassis ground.

Voltage zero

Check for an intermittent short to power in Circuit 376R. If okay, ECU may be at fault.

Voltage not zero

Check for a short to power in Circuit 376R. Repair as necessary.

136

013

05

Open circuit

2. Disconnect the black X2 connector at the ECU. Disconnect the retarder relay. Measure the resistance between Pin 7 of the black X2 ECU connector and relay connector cavity that corresponds to pin 85 of the relay.

Resistance less than 1 ohm

Check relay coil resistance (should be 60-85 Ohms). If okay, check circuit 81C (power to relay coil) for open. Repair as necessary.
Resistance more than 1 ohmRepair open in circuit 376R.

136

013

06

Short to ground

3. Disconnect the black X2 connector at the ECU. Disconnect the retarder relay. Measure the resistance between pin 7 of the X2 connector and a good chassis ground.Resistance is less than 10 OhmsCheck circuit 376R for short to ground. Repair as necessary.
Resistance is much greater than 10 OhmsCheck for intermittent short to ground in circuit 376R. If okay, ECU may be at fault.
J1587 Fault 136-014 Power
MIDSIDFMIProblemTestTest ResultAction

136

014

03

Voltage supplied to ECU with ignition OFF

1. Check for voltage backfeeding to ECU with the ignition off, especially to pins 7/X2 and 10/X2.

Voltage zero

Repair as necessary.

136

014

04

No voltage supplied to ECU with ignition ON

2. With the ignition ON, measure the voltage between Pin 3 of the black X2 ECU connector and a good chassis ground. Repeat between pin 11 and ground.

Voltage between

9.5 and 14 volts at both pins.

Check Circuit 376A for an intermittent open circuit. If the problem persists, suspect the ECU is at fault.
Voltage below

9.5 volts at one or both pins.

Check Circuit 376A for an open circuit and check Fuse F16. Repair as necessary.
J1587 Fault 136-023 ABS Warning Light
MIDSIDFMIProblemTestTest ResultAction

136

023

05

Open circuit or low current

1. Disconnect the black X2 connector from the ECU. Turn the ignition ON.

ABS light illuminates

Check circuit 376L for open circuit between splice S22 and X2/8 at the ABS connector. Repair as necessary.

ABS light does not illuminate

Check the bulb and wire (circuit 376L between splice S22 and ICU pin B11. If okay, replace the ICU.
J1587 Fault 136-030 Recirculation Pump Relay
MIDSIDFMIProblemTestTest ResultAction

136

030

03

Relay shorted to power

1. Disconnect the black X2 ECU connector. With the ignition ON, measure the voltage between Pin 6 and a good chassis ground.

Voltage zero

If the problem persists, suspect the ECU is at fault.

Voltage not zero

Circuit 376H is shorted to power. Repair as necessary.

136

030

05

Relay open circuit

2. Disconnect the black X2 ECU connector. Measure the resistance between Pin 6 and a good chassis ground.

Resistance between 50 and

200 ohms

If the problem persists, suspect the ECU is at fault.

Resistance below 50 or

above 200 ohms

Check the relay coil, relay coil ground circuit, and Circuit 376H for an open circuit. Repair as necessary.

136

030

06

Relay short to ground

3. Disconnect the black X2 ECU connector. Measure the resistance between Pin 6 and a good chassis ground.

Resistance between 50 and

200 ohms

If the problem persists, suspect the ECU is at fault.
Resistance below 50 or

above 200 ohms

Check Circuit 376H for a short to ground. Repair as necessary.
J1587 Fault 136-030 Recirculation Pump Relay
MIDSIDFMIProblemTestTest ResultAction

136

030

07

Pump relay sticks, pump continues to run when ECU deactivates the relay

NOTE: The problem may be intermittent and a new relay may be required to correct the fault.

4. If the fault is active, disconnect the black X2 connector from the ECU. With the ignition ON, check to see if the recirculation pump is running.

Pump OFF

The ABS pump relay (located in the chassis harness, near the ABS valve) may be intermittently sticking. Try a new relay and verify that the problem is solved.

Pump ON

The ABS pump relay (located in the chassis harness, near the ABS valve) is sticking. Replace the relay.
J1587 Fault 136-042 Left Front Inlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

042

03

05

06

Shorted to power (inlet valve)

Open circuit (inlet valve)

Shorted to ground (inlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 3 and 2 of the gray X1 ECU connector (Circuits 378LFI and GRDE).

Resistance reading 6.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.
4. Measure the resistance in Circuit 378LFI between modulator connector Pin 12 and connector Pin 3 on the gray X1 ECU connector.Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378LFI.

5. With the modulator valve connector removed, measure the resistance across Pins 12 and 8 on the modulator connector.

Resistance reading 6.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-043 Right Front Inlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

043

03

05

06

Shorted to power (inlet valve)

Open circuit (inlet valve)

Shorted to ground (inlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 4 and 2 of the gray X1 ECU connector (Circuits 378RFI and GRDE).

Resistance reading 6.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.

4. Measure the resistance in Circuit 378RFI between modulator connector Pin 4 and connector Pin 4 on the gray X1 ECU connector.

Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378RFI.

5. With the modulator valve connector removed, measure the resistance across Pins 4 and 8 on the modulator connector.

Resistance reading 6.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-044 Left Rear Inlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

044

03

05

06

Shorted to power (inlet valve)

Open circuit (inlet valve)

Shorted to ground (inlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 5 and 2 of the gray X1 ECU connector (Circuits 378LRI and GRDE).

Resistance reading 6.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.

4. Measure the resistance in Circuit 378LRI between modulator connector Pin 2 and connector Pin 5 on the gray X1 ECU connector.

Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378LRI.

5. With the modulator valve connector removed, measure the resistance across Pins 2 and 8 on the modulator connector.

Resistance reading 6.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-045 Right Rear Inlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

045

03

05

06

Shorted to power (inlet valve)

Open circuit (inlet valve)

Shorted to ground (inlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 6 and 2 of the gray X1 ECU connector (Circuits 378RRI and GRDE).

Resistance reading 6.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.

4. Measure the resistance in Circuit 378RRI between modulator connector Pin 11 and connector Pin 6 on the gray X1 ECU connector.

Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378RRI.

5. With the modulator valve connector removed, measure the resistance across Pins 11 and 8 on the modulator connector.

Resistance reading 6.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 6.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-048 Left Front Outlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

048

03

05

06

Shorted to power (outlet valve)

Open circuit (outlet valve)

Shorted to ground (outlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 10 and 2 of the gray X1 ECU connector (Circuits 378LFO and GRDE).

Resistance reading 3.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.
4. Measure the resistance in Circuit 378LFO between modulator connector Pin 13 and connector Pin 10 on the gray X1 ECU connector.Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378LFO.

5. With the modulator valve connector removed, measure the resistance across Pins 13 and 8 on the modulator connector.

Resistance reading 3.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-049 Right Front Outlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

049

03

05

06

Shorted to power (outlet valve)

Open circuit (outlet valve)

Shorted to ground (outlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 9 and 2 of the gray X1 ECU connector (Circuits 378RFO and GRDE).

Resistance reading 3.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.

4. Measure the resistance in Circuit 378RFO between modulator connector Pin 5 and connector Pin 9 on the gray X1 ECU connector.

Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378RFO.

5. With the modulator valve connector removed, measure the resistance across Pins 5 and 8 on the modulator connector.

Resistance reading 3.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-050 Left Rear Outlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

050

03

05

06

Shorted to power (outlet valve)

Open circuit (outlet valve)

Shorted to ground (outlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 8 and 2 of the gray X1 ECU connector (Circuits 378LRO and GRDE).

Resistance reading 3.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.

4. Measure the resistance in Circuit 378LRO between modulator connector Pin 1 and connector Pin 8 on the gray X1 ECU connector.

Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378LRO.

5. With the modulator valve connector removed, measure the resistance across Pins 1 and 8 on the modulator connector.

Resistance reading 3.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-051 Right Rear Outlet Solenoid Valve
MIDSIDFMIProblemTestTest ResultAction

136

051

03

05

06

Shorted to power (outlet valve)

Open circuit (outlet valve)

Shorted to ground (outlet valve)

NOTE: Check for an open circuit in the wiring between the ECU and the modulator valve. Check the ground circuit to the modulator valve.

1. Measure the resistance across Pins 7 and 2 of the gray X1 ECU connector (Circuits 378RRO and GRDE).

Resistance reading 3.5±0.5 ohmsCheck for intermittent wiring connections. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohms

Go to Test 2.

2. Check the ground circuit by measuring the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.Resistance reading close to zero

Go to Test 3.

Resistance reading not close to zeroCheck and repair the ground circuit.
3. With the modulator valve connector removed, measure the resistance between Pin 8 on the modulator connector and a good chassis ground.Resistance reading close to zero

Go to Test 4.

Resistance reading not close to zeroCheck the modulator ground circuit, repair as necessary.
4. Measure the resistance in Circuit 378RRO between modulator connector Pin 10 and connector Pin 7 on the gray X1 ECU connector.Resistance reading close to zero

Go to Test 5.

Resistance reading not close to zero

Repair Circuit 378RRO.

5. With the modulator valve connector removed, measure the resistance across Pins 10 and 8 on the modulator connector.

Resistance reading 3.5±0.5 ohms

Repeat Tests 1 through 5. The problem may be intermittent. If the wiring is OK, suspect the ECU is at fault.
Resistance reading not 3.5±0.5 ohmsReplace the modulator valve.
J1587 Fault 136-054 Recirculation Pump
MIDSIDFMIProblemTestTest ResultAction

136

054

03

Recirculation pump on without being activated by ECU

NOTE: In this case the ECU is sensing voltage on the pump monitor circuit (Pin 10 of the black X2 connector) when the pump relay was not activated by the ECU (Pin 6 of the black X2 connector).

1. Remove the black X2 connector from the ECU. With the ignition ON, measure the voltage between Pin 10 and a good chassis ground.

Voltage zero

Check the ECU and verify the fault.
Voltage not zeroGo to Test 2.

2. Remove the ABS pump relay (R17) and repeat Test 1.

Voltage zero

Check the ABS pump relay R17; it may be sticking or shorted.

Voltage not zero

Check for a short to power in Circuit 376B causing the pump to run when it should not be. Repair as necessary.

136

054

04

Recirculation pump does not switch on when activated by the ECU

NOTE: In this case the ECU does not sense voltage on the pump monitor circuit (Pin 10 of the black X2 ECU connector) when the pump relay was activated by the ECU (Pin 6 of the black X2 ECU connector).

3. Remove the black X2 connector from the ECU. With the ignition ON, link Pins 6 and 3 while measuring the voltage between Pin 10 and a good chassis ground. The pump should run (do not hold for more than 1 minute).

Voltage between

9.5 and 14 volts

Check for intermittent connections in Circuit 376B and check the ABS pump relay for intermittent operation. Repair as necessary.

Voltage below

9.5 or above 14 volts

Check Circuit 376A and check Relay R17. Repair as necessary.

136

054

07

Recirculation pump sticks or is locked

NOTE: In this case, the ECU senses high current on the pump monitor circuit (Pin 10 of the black X2 ECU connector) indicating the pump motor is locked.

4. Remove the black X2 connector from the ECU. With the ignition ON, momentarily link Pins 6 and 3. The pump should run (do not hold for more than 1 minute).

Pump runs

Repeat the test to verify. If the fault persists, suspect a problem with the ECU.

Pump does not run

Replace the recirculation pump.

J1587 Fault 136-055 ECU
MIDSIDFMIProblemTestTest ResultAction

136

055

02

Reference to ground interrupted

1. With the ignition OFF, measure the voltage between Pin 2 of the gray X1 ECU connector (Circuit GND) and a good chassis ground.Voltage zero voltsGo to Test 2.
Voltage not zero voltsCheck the ground circuit for a short to positive voltage.

2. Measure the resistance between Pin 2 of the gray X1 ECU connector and a good chassis ground.

Resistance near zero ohms

Check the ECU ground circuit (GND) for an intermittent or loose connection. Check ground Splice S10. If the problem persists, suspect the ECU is at fault.
Resistance above zero ohmsCheck the ECU ground circuit (GND). Repair as necessary.
J1587 Fault 136-251 Low Voltage
MIDSIDFMIProblemTestTest ResultAction

136

251

03

Voltage too high

NOTE: Voltage to the ABS ECU must be between 9.5 and 14 volts to function properly.

1. Disconnect the black X2 ECU connector. Start the engine and run it at governed speed while measuring the voltage between Pins 3 and 9.

Voltage between

9.5 and 14 volts

Check the electrical system. If the problem persists, suspect the ECU is at fault.
Voltage below

9.5 or above 14 volts

Check the batteries and charging system for malfunction. Repair as necessary.

136

251

04

Low voltage to ABS solenoid valves

NOTE: Voltage to the ABS ECU must be between 9.5 and 14 volts to function properly.

2. Disconnect the black X2 ECU connector. Start the engine and run it at idle while measuring the voltage between Pins 3 and 9 of the black X2 ECU connector.

Voltage between

9.5 and 14 volts

Verify that the batteries were not drained or the charging system was not overloaded when the fault occurred. If the problem persists, suspect the ECU is at fault.
Voltage below

9.5 or above 14 volts

Check the batteries and charging system for malfunction. Repair as necessary.
J1587 Fault 136-253 Internal Tire Parameter
MIDSIDFMIProblemTestTest ResultAction
13625302Incorrect internal tire parameterContact Meritor WABCO (1-800-535-5560).
J1587 Fault 136-254 ECU Internal Fault
MIDSIDFMIProblemTestTest ResultAction
13625412Internal ECU FaultReplace the ECU.

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Freightliner Business Class M2 Fault Codes List - ABS | Truckmanualshub.com (2024)

FAQs

Where is the ABS module located on a Freightliner M2? ›

The abs ECU is located outside along the frame, by the forward drive axle.

What is the code 136 on the Freightliner ABS? ›

164 means there is a fault in the bulkead module and 136 means there is an abs brake system fault which would not cause the truck to be down.

What is spn 639 fmi 9 freightliner M2? ›

Spn 639 Fmi 9- This is a datalink communication fault code with a loss of communication with the engine ECM.

How much horsepower does a Freightliner business class M2 have? ›

With a GVWR of up to 66,000 pounds, the Business Class M2 112 is the truck for the most demanding situations. It comes standard with a powerful MBE 4000 engine, with horsepower ratings from 350- 450 hp and 1,450 ft. -lbs. of torque.

What is the fault code for ABS module? ›

A code U0121 is a generic communication system diagnostic trouble code. It refers to an electrical issue that causes problems with the ABS, or Anti-Lock Brake System control module. Specifically, it refers to an error with the communication circuits between the ABS and at least one other control module.

How do you clear an ABS fault code? ›

The best method is to use an OBDII scan tool to reset the ABS light. However, it sometimes works to disconnect the battery to clear the codes.

What is the code for faulty ABS sensor? ›

Common fault codes

C0065: Left front ABS solenoid 2 circuit malfunction. C0070: Right front ABS solenoid 1 circuit malfunction. C0075: Right front ABS solenoid 2 circuit malfunction. C0080: Left rear ABS solenoid 1 circuit malfunction.

What is code B1342 ABS? ›

Sometimes the B1342 code is telling you that systems like the ABS or the power steering control unit need to be examined. The ECU operates by way of hundreds of sensors that are all interconnected, and these sensors monitor everything from fuel economy to emissions and from fuel injection to spark plug timing.

What does spn 639 mean? ›

You will see SPN 639 pop-up when communication has been lost between the engine control module (ECM) and another device via the SAE J1939 data link. The check engine light will illuminate, and the ECM immediately logs the fault code.

What is Freightliner code SPN 1592 FMI 9? ›

SPN 1592/FMI 9

Description This Fault Code Indicates a Missing Message from the Antilock Brake System (ABS) Module. Check as follows: 1. Check for multiple codes. Are there any SPN 168 (battery voltage) fault codes present?

What is spn 174 code freightliner? ›

SPN 174/FMI 4

Description This Fault Code Sets when the Motor Control Module (MCM) Detects a Short to Ground on the Supply Fuel Temperature Circuit.

How many miles will a Freightliner M2 last? ›

They're built to last.

They offer a 400K-mile B10 life and the longest maintenance intervals in its class. The M2 106 is also incredibly durable, featuring a steel-reinforced aluminum cab that's lightweight yet tough.

Is a Freightliner M2 a good truck? ›

The Best Just

With an all-new interior for more comfort, powertrain options for increased performance and one of the most advanced active safety technologies that protect drivers and operators, the M2 106 Plus makes one of the most trusted medium-duty trucks even better.

What is the difference between the Freightliner M2 106 and 112? ›

The M2 100 and 106 were initially equipped with standard Mercedes-Benz MBE900 diesel engines, with the M2 106 offering Caterpillar engines as an option. The M2 112 was fitted with larger engines, using the MBE4000 as standard (with larger engines distinguished by a taller grille and a flatter hood).

Where is the ABS module located? ›

The ABS module in most cars should be located on the driver's side front corner of the engine compartment. The hard brake lines should be attached to the unit, which should help you locate your car's module.

Can you replace ABS module yourself? ›

For the most part the ABS system components are fairly straightforward to replace.

Where is the chassis module on a Freightliner m2? ›

NOTE: The Chassis Module is mounted on the left frame rail, aft of the cab.

Where is the ABS module fuse located? ›

The fuse box for the ABS is located in the engine compartment on the passenger's side. To open it, push the tab as shown. 253 to 256, or the diagram on the fuse box lid, which fuse or fuses control that component. Check those fuses first, but check all the fuses before deciding that a blown fuse is not the cause.

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