U0146

U0146-LOST COMMUNICATION WITH CENTRAL GATEWAY

For a complete wiring diagram Refer to Diagrams/Electrical.


- When Monitored:

- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- Set Condition:
If the Automatic Sway-Bar System Module either fails to receive bus messages from the Engine Control Module (ECM) for approximately 500 ms, or it receives invalid messages from the ECM, or it detects messages from the ECM are of improper data length.








Diagnostic Test


1. VERIFY DTC IS ACTIVE
NOTE: Ensure 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 ASBS DTCs.
With the scan tool, read and record Environmental Data (EV Data).
With the scan tool, erase ASBS DTCs.
Cycle the ignition switch.
With the scan tool, read ASBS DTCs.
Does this DTC reset?

Yes


- Go To 2


No


- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform ASBS VERIFICATION TEST.ASBS Verification Test




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).
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.


No


- Go To 3




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

Yes


- Go To 4


No


- "Perform the Stored Lost Communication test procedure. Stored Lost Communication DTCs
" - Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.




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 ECM?

Yes


- Replace/update the ECM.


No


- Replace and program the Final Drive Control Module.
- Perform ASBS VERIFICATION TEST.ASBS Verification Test