Expedition 4WD V8-4.6L SOHC VIN W (1999)
Turn Signal Switch: Flow of Diagnosis
1. Verify the customer concern by operating the multifunction or ignition switch.
2. Visually inspect for obvious signs of mechanical and electrical damage.
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:
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check that the program card is properly installed.
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check the connections to the vehicle.
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check the ignition switch position.
4. If NGS Tester 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:
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CKT9 14, CKT9 15 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, diagnose the Module Communication Network.
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NO RESP/NOT EQUIP for GEM, go to Pinpoint Test A.See: Pinpoint Tests/Test A: No Communication With The Module-GEM
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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 the Generic Electronic Module (GEM) Diagnostic Trouble Code (DTC) Index to continue
diagnostics.See: Diagnostic Trouble Code Descriptions/GEM Diagnostic Trouble Code Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics.See: Symptom Related Diagnostic Procedures
