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System Tests: Notes

WARNING: This page is about a different car, the 2002 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
SYMPTOM INDEX

Symptom Perform Test
No Communication With Natural Gas Vehicle Module J 
Integrated Circuit Display Inoperative Or Erratic K 
No Communication With Instrument Cluster (1)
Fuel Gauge Inaccurate (2)
(1) See INSTRUMENT PANELS - ANALOG - F150 PICKUP - GASOLINE article for diagnostics.
(2) Using New Generation Star (NGS) tester, perform Natural Gas Vehicle Module (NGVM) self-test. If DTCs are retrieved, perform appropriate test. See NATURAL GAS VEHICLE MODULE DIAGNOSTIC TROUBLE CODE TEST INDEX  under SELF-DIAGNOSTIC SYSTEM. If no DTCs are retrieved, perform TEST L: INCORRECT FUEL GAUGE INDICATION .