PCM/ECM MESSAGES NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The BCM does not receive any messages from the PCM/ECM for at least 30 seconds.
| Possible Causes |
| PCM/ECM POWER AND GROUND |
| CAN C BUS CIRCUIT FAULT |
| BODY CONTROL MODULE |
Diagnostic Test
1. ATTEMPT TO COMMUNICATE WITH THE PCM/ECMTurn the ignition on.
With the scan tool attempt to communicate with the PCM/ECM.
Was the scan tool able to I/D or communicate with the PCM/ECM?
Yes
- Go To2
No
- Refer to the table of contents and perform the related symptom.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
2. BODY CONTROL MODULE
With the scan tool, erase the BCM DTC's.
Turn the ignition on and wait approximately 1 minute.
With the scan tool, read the BCM DTC's.
Did this DTC reset?
Yes
- Ensure the CAN C Bus circuits are not open at the BCM, if ok then replace the Body Control Module in accordance with the service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.