F 350 2WD Super Duty V10-6.8L VIN S (1999)
Turn Signal Switch: Flow of Diagnosis
1. Verify the customer concern by operating the multi-function switch or ignition switch.
2. Visually inspect for obvious signs of mechanical and electrical damage.
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If equipped with manual transmission, the key release button prevents rotation of the ignition switch lock cylinder to LOCK or ACC positions
unless the key release button is depressed.
Visual Inspection 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:
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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 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:
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CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, diagnose the Module Communications Network.
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NO RESP/NOT EQUIP for GEM, go to Pinpoint Test E. See: Powertrain Management/Ignition System/Sensors and Switches - Ignition
System/Ignition Switch/Testing and Inspection/Pinpoint Tests/Test E: 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 GEM Diagnostic Trouble Code (DTC) Index to continue diagnostics. See: Diagnostic
Trouble Code Descriptions/GEM Diagnostic Trouble Code (DTC) Index
7. If no DTCs related to the concern are retrieved, to GEM Diagnostic Trouble Code (DTC) Index to proceed to Symptom Chart to diagnostics. See:
Symptom Related Diagnostic Procedures
