Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 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 DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.
  Does the scan tool display: U0401-IMPLAUSIBLE DATA RECEIVED FROM 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 appropriate Electrical Diagnostic Information and perform the appropriate CAN Bus diagnostic procedure. .
  No
  - Go To 3.
PCM DTCS ARE PRESENT
1. With the scan tool, read Powertrain Control Module DTCs.
  Are there any PCM DTCs present?
  
  Yes
  - Refer to appropriate Electrical Diagnostic Information and perform the appropriate diagnostic procedure. .
  No
  - Replace the Final Drive Control Module (FDCM) in accordance with the Service Information.
  - Perform FDCM VERIFICATION TEST. Refer to Standard Procedure .
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 the FDCM VERIFICATION TEST. Refer to Standard Procedure .
  No
  - Test complete.