Initial Inspection and Diagnostic Overview

NOTE: The Generic Electronic Module (GEM)/Central Timer Module (CTM) must be reconfigured upon replacement.

1. Verify the customer concern by operating file system in question.
2. Visually inspect for obvious signs of mechanical or electrical damage.

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
^ Low engine coolant level
^ Damaged water thermostat

Electrical
^ Blown Central Junction Box (CJB) fuse(s):
- Fuse 11 (7.5 A)
- Fuse 15 (7.5 A)
- Fuse 25 (7.5 A)
^ Blown Battery Junction Box (BJB) Maxi-Fuse 1 (60 A)
^ Damaged miniature bulbs
^ Damaged wiring harness
^ Loose or corroded connectors
^ Damaged instrument cluster
^ Damaged instrument cluster printed circuit

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

If the system(s) is/are not working correctly, refer to the appropriate system/component.

4. If the concern remains after file inspection, connect file 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 file NGS does not communicate with the vehicle:
^ check that the program card is correctly installed.
^ check the connections to file 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. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS Tester responds with:
^ CKT914, CKT915 or CKT170 = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for Generic Electronic Module (GEM), go to Pinpoint Test U. U: No Communication With The GEM
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out 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. GEM/CTM Diagnostic Trouble Code (DTC) Index
8. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures