Transmission Control Module (TCM) - AS68RC

U1449-IMPLAUSIBLE ERS MESSAGE RECEIVED

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

Theory of Operation

This message is used by the Transmission Control Module (TCM) for Electronic Range Select (ERS) operation. The ERS switch is hard wired to the Cabin Compartment Node (CCN). The CCN then sends a CAN bus message to the TCM.

- When Monitored:
Continuously with the ignition on.

- Set Condition:
This fault is set when the ERS message is not received or invalid.





Always perform the AS68RC Pre-Diagnostic Troubleshooting procedure before proceeding. AS68RC Pre-Diagnostic Troubleshooting Procedure

1. CHECK FOR TIPM CAN BUS DTCs
1. With the scan tool, read TIPM DTCs.

Are there any TIPM CAN BUS DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 2

2. CHECK IF CCN DTCs ARE PRESENT
1. With the scan tool, read CCN DTCs.

Are there any CCN DTCs present?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform the AS68RC TRANSMISSION VERIFICATION TEST. AS68RC Transmission Verification Test.