Initial Inspection and Diagnostic Overview

1. Verify the customer's concern by operating the coolant indication system to duplicate the condition.
2. Inspect to determine if one of the mechanical or electrical concerns apply:

VISUAL INSPECTION CHART

Mechanical
- Verify that coolant level in radiator coolant recovery reservoir is at proper level.
- Check radiator coolant recovery reservoir and hoses for obvious damage or leaks.

Electrical
- Open Fuses - fuse junction panel: Fuse 5 (5 A) and 23 (5 A).
- Check harness connections for obvious damage, opens or shorts.

3. If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
4. If a concern remains after the inspection, connect the Rotunda New Generation Star (NGS) Tester, 418-F048 (007-00500) or equivalent to the Data Link Connector (DLC) located beneath the instrument panel to perform DATA LINK DIAGNOSTICS test. If the NGS responds with NO RESPONSE/NOT EQUIPPED for the generic electronic module, go to Pinpoint Test A. Test A: No Communication With Generic Electronic Module

If the DATA LINK DIAGNOSTICS test is passed for the generic electronic module, retrieve continuous memory DTCs and execute Self Test Diagnostics for the generic electronic module to retrieve current DTCs.

5. If self test is passed and no DTCs are retrieved, go to the Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
6. If DTCs are retrieved, go to the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. GEM Wiggle Test Diagnostic Trouble Code Index
7. If the generic electronic module cannot be accessed by the NGS, go to Pinpoint Test A. Test A: No Communication With Generic Electronic Module

Rotunda Service Bay Diagnostic System (SBDS (R)) 418-F001 (001-00001) may also be used to diagnose this system.