U1503

U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM

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 Front Control Module (FCM).





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

Are there any FCM CAN BUS DTCs.present?

Yes

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

No

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