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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (6.7L Diesel - DTCS - P21C4 To U1601 - 3500 Cab & Chassis) >> Diagnosis and Testing >> U1421-Implausible Ignition Key Off Time Received >> Testing >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    Low battery voltage as well or an IOD fuse which is missing or not pushed in completely can cause the DTC to set. Make sure that the battery is fully charged and Ignition Off Draw (IOD) fuse is properly installed before continuing.

    1. Ignition on, engine not running.
    2. With a scan tool clear DTCs.
    3. Turn the ignition off for 75 seconds.
    4. Turn the ignition on.
    5. With a scan tool read DTCs.

      Is the DTC active at this time?

      Yes 

      • Go To  3.

      No 

  2. CHECKING THE PCM POWERS AND GROUNDS 
    1. Perform the CHECKING THE PCM POWERS AND GROUNDS diagnostic procedure. Refer to Diagnosis and Testing , 6.7L .

      Were any problems found?

      Yes 

      No 

      • Go To  3.
  3. CHECKING FOR TSB/PCM FLASH UPDATES 
    1. Check for any Service Bulletins or PCM flash updates that may apply.

      Were any Service Bulletins or PCM flash updates found?

      Yes 

      No 

      • Go To  4.
  4. CAN B BUS HARDWARE DTCS ALSO ACTIVE 
    1. With a scan tool check for DTCs in the TIPM.

      Are any CAN B Hardware related DTCs active at this time?

      Yes 

      No 

      • Replace and program the Powertrain Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .