U1502

U1502-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM TCM

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

- When Monitored:
Continuously with the ignition on.

- Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Transmission Control Module (TCM).





1. CHECK IF TCM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read TCM DTCs.

Are there any TCM CAN BUS DTCs present?

Yes

- Diagnose and repair the DTC(s). Testing and Inspection.

No

- Go To 2

2. CHECK IF TRANSMISSION DTCS ARE PRESENT
1. With the scan tool, read Transmission DTCs.

Are there any Transmission DTCs present?

Yes

- Diagnose and repair the DTC(s) Testing and Inspection.

No

- Using the schematics as a guide, check the Anti-Lock Brake Module 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 Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST ABS Verification Test.