Antilock Brake Module (ABS)

U0100-LOST COMMUNICATION WITH ECM/PCM

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

- When Monitored:

- With the ignition on.
- Battery voltage between 10 and 16 volts.
- Ignition Off Draw (IOD) fused installed.
- Front Control Module (FCM) is configured correctly.
- Set Condition:
Bus messages not received from the Engine Control Module (ECM) / Powertrain Control Module (PCM) for approximately 500 ms.





1. VERIFY DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Perform the Stored Lost Communication DTCs diagnostic procedure. Stored Lost Communication DTCs

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read all active DTCs from all modules.

NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTC to the conditions listed above?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THAT THE ECM/PCM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network Diagnostics.
3. Verify that the ECM/PCM is active on the bus.

Is the ECM/PCM active on the bus?

Yes

- Go To 4

No

- Perform the Loss of Communication with ECM or PCM diagnostic procedure. No Response From ECM (Engine Control Module) No Response From PCM (Powertrain Control Module)

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs "Logged Against" the ECM/PCM?

Yes

- Replace/update the ECM/PCM.
- Perform appropriate VERIFICATION TEST for gas engine applications. Testing and Inspection

No

- Replace the Anti-Lock Brake Module.
- Perform the ABS VERIFICATION TEST ABS Verification Test.