Initial Inspection and Diagnostic Overview

NOTE: The Generic Electronic Module (GEM)/Central Timer Module (CTM) must be reconfigured upon replacement. Refer to the New Generation STAR (NGS) Tester help screen on the configuration card to program the tire size and axle ratio.

1. Verify the customer concern by operating the system in question.
2. Visually inspect the components listed in the following chart.

VISUAL INSPECTION CHART

Mechanical
- Damaged engine oil filter
- Damaged oil pump
- Low engine oil level
- Stuck oil pressure gauge needle
- Stuck coolant temperature gauge
- Door adjustment
- Tripped Inertia Fuel Shutoff (IFS) switch
- Engine coolant level
- Damaged water thermostat

Electrical
- Blown fuse(s)
- Damaged miniature bulbs
- Damaged wiring harness
- Loose or corroded connectors
- Damaged instrument cluster

3. Verify the following systems are working properly:
- Charging.
- Fuel.
- Cooling.
- Safety belt warning chime (GEM/CTM).
- Turn signals.
- Headlamps.
- Anti-theft.

4. 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.
5. If the NGS still does not communicate with the vehicle, refer to the New Generation STAR Tester manual.
6. Perform the DATA LINK DIAGNOSTIC TEST. If the NGS Tester responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
- NO RESP/NOT EQUIP for generic electronic module (GEM), go to Pinpoint Test U.
- SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and perform self-test diagnostics for the GEM/CTM.
7. If the DTCs retrieved are related to the concern, go to the GEM/CTM Diagnostic Trouble Code (DTC) Index to continue diagnostics.
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures