U0146

U0146-LOST COMMUNICATION WITH CENTRAL GATEWAY

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- Set Condition:
If the Anti-Lock Brakes Module either fails to receive bus messages from the Totally Integrated Control Module (TIPM) for approximately 500 ms, or it receives invalid messages from the TIPM, or it detects messages from the TIPM are of improper data length.





Diagnostic Test

1. VERIFY DTC IS ACTIVE
NOTE: Verify the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

Turn the ignition on.
With the scan tool, read and record ABS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase ABS DTCs.
Cycle the ignition switch.
With the scan tool, read ABS DTCs.
Does this DTC reset?

Yes

- Go to 2

No

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

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

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

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

Yes

- Diagnose and repair the DTC(s).

No

- Go to 3

3. VERIFY THAT THE TIPM IS ACTIVE ON THE BUS
With the scan tool, select ECU View.
Verify that the TIPM is active on the bus.
Is the TIPM active on the bus?

Yes

- Go to 4

No

- for No Response related diagnostic procedures.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
With the scan tool, select Network View and select Advanced.
Is there more than one module with active DTCs "Logged Against" the TIPM?

Yes

- Replace/update the TIPM.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

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