Diagnostic Test
WARNING: This page is about a different car, the 2012 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK FOR DTC U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM NOTE:
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 DTC's.
- Cycle the ignition switch from off to on.
- With the scan tool, read DTC's.
Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?
Yes
- Go To 2.
No
- Perform the ABS INTERMITTENT CONDITION diagnostic procedure. Refer to ABS INTERMITTENT CONDITION .
- CHECK IF TIPM CAN BUS DTCS ARE PRESENT
- With the scan tool, read FCM DTC's.
Are there any TIPM CAN BUS DTC's present?
Yes
- Perform the appropriate diagnostic procedures. Refer to TIPM - DIAGNOSIS AND TESTING .
- Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
No
- Go To 3.
- With the scan tool, read FCM DTC's.
- CHECK IF ENGINE DTCS ARE PRESENT
- With the scan tool, read Engine DTC's.
Are there any Engine DTC's present?
Yes
- Perform the appropriate diagnostic procedures. Refer to 5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS and/or 6.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS, 4500 & 5500 .
No
- Using the schematics as a guide, check the Antilock 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 Antilock Brake Module per the Service Information.
- Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST .
- With the scan tool, read Engine DTC's.