U1503-IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM FCM
For a complete wiring diagram Refer to Section 8W
- 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).
| Possible Causes |
| FCM CAN BUS DTCS |
| ANTI-LOCK BRAKE MODULE |
Diagnostic Test
1. CHECK IF FCM CAN BUS DTCs ARE PRESENTWith the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTCs present?
Yes
- Refer to 8-ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING and diagnose the appropriate symptom.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
No
- Replace the Anti-Lock Brakes Module in accordance with the Service Information.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).