U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM
For a complete wiring diagram Refer to Section 8W
- 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 |
| ABM CAN BUS DTCS |
| ENGINE DTCS |
| ANTI-LOCK BRAKE MODULE |
Diagnostic Test
1. CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCMNOTE: This DTC must be active for the results of this test to be valid.
Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
With the scan tool, read DTCs.
Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION diagnostic procedure.
- Refer to the ABS-INTERMITTENT CONDITION TEST. (Refer to 5 - BRAKES - DIAGNOSIS AND TESTING)
Diagnostic Test
2. 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
- Go To 3
3. CHECK IF ENGINE DTCS ARE PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine DTCs present?
Yes
- Refer to the 9 - ENGINE ELECTRICAL DIAGNOSTICS and diagnose the appropriate symptom.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).
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 per the Service Information.
- Perform ABS VERIFICATION TEST. (Refer to 5 - BRAKES - STANDARD PROCEDURE).