Flow of Diagnosis

1. Verify the customer concern by operating the 2WD/4WD engagement.
2. Visually inspect for obvious signs of mechanical, electrical and vacuum damage; refer to the following chart:





3. If the concern remains after the inspection connect the New Generation STAR (NGS) Tester to the Data Link Connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
- Check that the program card is properly installed.
- Check the connections to the vehicle.
- Check the ignition switch position.

4. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
5. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
- CKT 914, CKT 915 OR CKT 70 = ALL ECUS NO RESP/NOT EQUIP.
- NO RESP/NOT EQUIP for Generic Electronic Module (GEM), go to Pinpoint Test E.
- SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the GEM.

6. If the DTCs retrieved are related to the concern, go to GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
7. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.