Diagnostic Test

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. Go to 2).
No
1. Go to 6).
2) NO COMMUNICATION WITH SKREEM/WCM
NOTE: For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.

With the scan tool, attempt to communicate with the SKREEM/WCM.

Can the scan tool communicate with the SKREEM/WCM?

Yes
1. Go to 3).
No
1. Refer to VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS article and perform the appropriate Diagnostic Procedure.
2. Perform SKREEM/SKIM VERIFICATION TEST .
3) SKREEM/WCM TROUBLE CODES SET
With the scan tool, check for SKREEM/WCM DTCs.

Are any DTCs present in the SKREEM/WCM?

Yes
1. Refer to VEHICLE THEFT SECURITY - ELECTRICAL DIAGNOSTICS article and perform the appropriate Diagnostic Procedure.
2. Perform SKREEM/SKIM VERIFICATION TEST .
No
1. Go to 4).
4) VIN PROGRAMMED INTO PCM
With the scan tool, display the VIN that is programmed in the PCM.

Has a VIN been programmed into the PCM?

Yes
1. Go to 5).
No
1. Program the correct VIN into the PCM and retest.
2. Perform SKREEM/SKIM VERIFICATION TEST .
5) POWERTRAIN CONTROL MODULE (PCM)
Turn the ignition off.

Replace and program the SKREEM/WCM in accordance with the Service Information.

Ignition on, engine not running.

With the scan tool, erase all SKREEM/WCM and PCM DTCs.

Attempt to start the engine.

With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes
1. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information.
2. Perform SKREEM/SKIM VERIFICATION TEST .
No
1. Test Complete.
6) IGNITION KEY
NOTE: This DTC could have been set if the SKREEM/WCM harness connector was disconnected, or if the SKREEM/WCM was replaced recently.

NOTE: All of the ignition keys for this vehicle must be tested to verify proper operation.

NOTE: If this DTC cannot be reset, it could have been an actual theft attempt.

Ignition on, engine not running.

Verify that the correct VIN is programmed into the PCM and SKREEM/WCM.

Turn the ignition off.

Using each vehicle key, turn the ignition on and start the engine.

With a scan tool, View DTCs for each key.

Is the status Active for this DTC?

Yes
1. Replace the ignition key.
2. Perform SKREEM/SKIM VERIFICATION TEST .
No
1. Test Complete.