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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Powertrain Diagnostic Procedures - Gas) >> Diagnostic Information And Procedures >> Sentry Key Immobilizer - Symptoms >> Symptom List: PCM STATUS FAILURE; SERIAL LINK EXTERNAL FAULT >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
PCM STATUS FAILURE, SERIAL LINK EXTERNAL FAULT DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1
NOTE: Ensure the ECM has proper power and ground connections before continuing.
With the DRBIII®, read and record the SKIM DTCs then erase the SKIM DTCs.Turn the ignition off.Wait 2 minutes.Turn the ignition on.With the DRBIII®, read the SKIM DTCs.Does the DRBIII® display the DTC that was previously erased?Yes --> Go To 2No --> Go To 4		 All
2 Turn the ignition off.
NOTE: Visually inspect the related wiring harness and CCD/PCI Bus (whichever applicable) circuits. Look for any chafed, pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
NOTE: Refer to any Technical Service Bulletins (TSBs) that may apply.

Were any problems found?
Yes --> Repair as necessary.
Perform SKIS VERIFICATION .
No --> Go To 3		 All
3
NOTE: Before proceeding it will be necessary to obtain the SKIM PIN.
Turn the ignition on.With the DRBIII®, display and erase all ECM and SKIM DTCs.Perform 5 ignition key cycles , leaving the ignition key on for a minimum of 90 seconds per cycle.With the DRBIII®, read the SKIM DTCs.Does the code appear?Yes --> Replace and program the Engine Control Module in accordance with the Service Information.Perform SKIS VERIFICATION .No --> Test Complete.		 All
4 Turn the ignition off.
NOTE: Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
NOTE: Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
NOTE: Refer to any Technical Service Bulletins (TSBs) that may apply.

Were any problems found?
Yes --> Repair wiring harness/connectors as necessary.
Perform SKIS VERIFICATION .
No --> Test Complete.		 All
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