51A1

51A1-IMPLAUSIBLE ENGINE TORQUE MESSAGE RECEIVED

For a complete wiring diagram consult Diagrams/Electrical Electrical Diagrams


Theory of Operation


The messages sent on the CAN bus are distinguished by an identifier (ID). Each CAN ID is defined to contain a certain number of bytes. The Transmission Control Module (TCM) verifies that it has received the proper number of bytes for each ID.


- When Monitored:

Continuously with the ignition on, one valid CAN ID received at least once.

- Set Condition:

When the TCM detects an incorrect CAN ID from the ECM/PCM.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.



Diagnostic Test


1. CHECK FOR BCM CAN BUS DTCS

With the scan tool, read BCM/FCM DTCs.

Are there any BCM CAN BUS DTCs present?

Yes

- Test and repair the DTC as Necessary..
- Perform NAG1 TRANSMISSION VERIFICATION TEST.

No

- Go To 2



2. CHECK IF ENGINE DTCS ARE PRESENT

With the scan tool, read engine DTCs.

Are there any engine DTCs present?

Yes

- Diagnose and repair the DTC(s).
- Perform NAG1 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 the TCM.
- Perform NAG1 TRANSMISSION VERIFICATION TEST.