51A0

51A0-IMPLAUSIBLE ENGINE SPEED 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 Anti-Lock Brake Module (ABM) 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 ABM detects an incorrect CAN ID from the ECM/PCM.








Diagnostic Test


1. CHECK FOR BCM CAN BUS DTCS

With the scan tool, read BCM DTCs.

Are there any BCM CAN BUS DTCs present?

Yes

- Diagnose and repair the DTC(s).
- Perform ABS VERIFICATION TEST. Verification Tests

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 ABS VERIFICATION TEST. Verification Tests

No

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. Verification Tests