Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. 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.
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.
  Does the scan tool display: U0401-00 IMPLAUSIBLE DATA RECEIVED FROM ECM/PCM?
  
  Yes
  - Go To 2.
  No
  - Go To 4.
CHECK IF TIPM CAN BUS DTCS ARE PRESENT
1. With the scan tool, read TIPM DTCs.
  Are there any TIPM CAN BUS DTCs present?
  
  Yes
  - Refer to DIAGNOSIS AND TESTING and perform the appropriate diagnostic procedure.
  No
  - Go To 3.
POWERTRAIN DTCS PRESENT
1. With the scan tool, read PCM DTCs.
  Are there any active DTCs present?
  
  Yes
  - Refer to appropriate Powertrain DIAGNOSTIC CODE INDEX articles and perform the appropriate diagnostic procedure. .
  No
  - Replace the Integrated Trailer Brake Module (ITBM) in accordance with the Service Information.
  - Refer to Standard Procedure and perform the ITBM VERIFICATION TEST.
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
3. Wiggle test the wiring harness and connectors while checking for shorted and open circuits.
4. Using the scan tool, monitor the data related to this circuit while performing the wiggle test. Look for the data to change or for the DTC to reset.
  Were there any problems found?
  
  Yes
  - Repair as necessary.
  - Refer to Standard Procedure and perform the ITBM VERIFICATION TEST.
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time.