Antilock Brake/Traction Control System

U0401 -IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM





- When Monitored:
Continuously with the ignition on, one valid CAN message received at least once, and no U0002-CAN C Bus Off Performance DTC present.
- Set Condition:
When the Anti-Lock Brake Module detects an incorrect CAN message from the Engine Control Module (ECM).

Possible Causes
FCM CAN BUS DTCS
ENGINE DTCS
ANTI-LOCK BRAKE MODULE

Diagnostic Test
1. CHECK IF FCM CAN BUS DTC's ARE PRESENT





With the scan tool, read FCM DTCs.
Are there any FCM CAN BUS DTC's present?
Yes >> Refer to Manufacturer Code Charts / Communication . Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 2

2. CHECK IF ENGINE DTC's ARE PRESENT





With the scan tool, read Engine DTCs.
Are there any Engine DTC's present?
Yes >> Refer to COMPUTERS AND CONTROL SYSTEMS/TESTING AND INSPECTION. Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Using the schematics as a guide, check the Anti-Lock Brake Module pins, terminals, and connectors for corrosion, dam age, 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 - VER 1. ABS Verification Test