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Home › Jeep › 2012 › Compass Limited, FWD, Standard › Repair and Diagnosis › External Pages › Different car › Section 574 ((Forward Facing Camera Module (FFCM) - Electrical Diagnostics)) › DTC Troubleshooting › U0420-00-Invalid Data Received From Power Steering Control Module › Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Charger and 2015 Dodge Charger. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, record and erase Forward Facing Camera Module (FFCM) DTCs.
    3. Cycle the ignition from off to on.
    4. With the scan tool, read FFCM DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

      • Go To  5
  2. CHECK FOR BODY CONTROL MODULE (BCM) DTCS 
    1. With the scan tool, read BCM DTCs and record on the repair order.

      Are there any BCM CAN Bus DTCs present?

      Yes 

      No 

      • Go To  3
  3. CHECK FOR ELECTRIC POWER STEERING (EPS) MODULE DTCS 
    1. With the scan tool, read EPS DTCs.

      Are there any EPS DTCs present?

      Yes 

      No 

      • Go To  4
  4. CHECK OTHER MODULES FOR DTCS 
    1. With the scan tool, read DTCs.

      Are there any other modules reporting implausible communication DTCs against the EPS?

      Yes 

      • Replace and program the Electric Power Steering (EPS) Module in accordance with the Service Information.
      • Perform the FORWARD FACING CAMERA VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Using the schematics as a guide, check the FFCM pins, terminals, and connectors for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Is no problems are found, replace and program the Forward Facing Camera Module (FFCM) in accordance with the Service Information. Refer to MODULE, FORWARD FACING CAMERA, REMOVAL .
      • Perform the FORWARD FACING CAMERA VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  5. CHECK THE WIRING AND CONNECTORS 
    1. The conditions necessary to set the DTC are not present at this time.
    2. Using the schematics as a guide, inspect the wiring and connectors specific to this Module. Wiggle the wiring and connectors while checking for shorted and open circuits.
    3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
    4. Check Service Bulletins for any possible causes that may apply.

      Were any problems found?

      Yes 

      • Repair as necessary.
      • Perform the FORWARD FACING CAMERA VERIFICATION TEST. Refer to STANDARD PROCEDURE .

      No 

      • Test complete.
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