Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup and 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 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 DTC's.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTC's.
  Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM PCM?
  
  Yes
  - Go To 2.
  No
  - Go To 4.
CHECK IF TIPM CAN BUS DTC's ARE PRESENT
1. With the scan tool, read TIPM DTC's.
  Are there any TIPM CAN BUS DTC's present?
  
  Yes
  - Refer to TIPM - DIAGNOSIS AND TESTING and perform the appropriate CAN Bus diagnostic procedure.
  No
  - Go To 3.
PCM DTC's ARE PRESENT
1. With the scan tool, read Powertrain Control Module DTC's.
  Are there any PCM DTC's present?
  
  Yes
  - Refer to 3.7L/4.7L/5.7L - DIAGNOSTIC CODE INDEX - NGC - 1500 & 2500 or 6.7L - DIAGNOSTIC CODE INDEX - 2500 & 3500 or 5.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS or 6.7L - DIAGNOSTIC CODE INDEX - 3500 CAB & CHASSIS, 4500 & 5500 and perform the appropriate diagnostic test procedure.
  No
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information.
  - Perform FDCM VERIFICATION TEST. Refer to FDCM VERIFICATION TEST .
INTERMITTENT WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
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.
  - Perform FDCM VERIFICATION TEST. Refer to FDCM VERIFICATION TEST .
  No
  - Test complete.