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Home >> Jeep >> 2007 >> Commander Base, 4.7 P, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Vehicle Theft Security System - Electrical Diagnostics >> Vehicle Theft Security - Electrical Diagnostics >> DTC Troubleshooting >> B1A28-ECM Mismatch With Skim >> Diagnostic Test

Diagnostic Test

  1. 1) DETERMINING IF DTC IS CURRENT 

    With the scan tool, erase the SKREEM DTCs.

    Turn the ignition off.

    Wait 10 seconds.

    Turn the ignition on and wait 2 minutes.

    With the scan tool, read the SKREEM DTCs.

    Does the scan tool display the DTC that was previously erased? 

    Yes 

    1. Go to  2).

    No 

    1. Go to  4).
  2. 2) VERIFYING THE PCM VIN 

    Turn the ignition on.

    With the scan tool, select Engine system from the main menu.

    Display and record the Vehicle Identification Number.

    NOTE: Make sure that a VIN has been programmed into the PCM. If a VIN is not displayed, attempt to program the PCM with the correct VIN before continuing.

    Does the VIN recorded from the PCM match the VIN of the vehicle? 

    Yes 

    1. Go to  3).

    No 

    1. Perform the PCM replaced to update the VIN in the PCM.
    2. Perform SKREEM/SKIM VERIFICATION TEST .
  3. 3) REPLACE SKREEM AND CHECK DTC'S 

    Turn the ignition off.

    Replace and program the Sentry Key Remote Entry Module in accordance with the Service Information.

    NOTE: If this vehicle is equipped with a Steering Column Lock Module, it must be replaced along with the SKREEM.

    Turn the ignition on.

    With the scan tool, display and clear all PCM and SKREEM DTC's.

    Perform 5 ignition key cycles leaving the ignition key on for 90 seconds per cycle.

    With the scan tool, check for SKREEM DTCs.

    Does the scan tool display the same DTC? 

    Yes 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information.
    2. Perform SKREEM/SKIM VERIFICATION TEST .

    No 

    1. The repair is complete.
    2. Perform SKREEM/SKIM VERIFICATION TEST .
  4. 4) INTERMITTENT 

    Turn the ignition off.

    NOTE: Check for the following conditions:
    • Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
    • Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
    • Refer to any Technical Service Bulletins (TSB) that may apply.

    Were any problems found? 

    Yes 

    1. Repair wiring harness/connectors as necessary.
    2. Perform SKREEM/SKIM VERIFICATION TEST .

    No 

    1. Test Complete.
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