Test E: Warning Indicator Off With Ignition On

WARNING: This page is about a different car, the 2003 Mercury Sable, 2003 Ford Taurus, 2002 Mercury Sable, and 2002 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

Connect New Generation Star (NGS) tester to Data Link Connector (DLC). Turn ignition on. Using NGS tester, perform Powertrain Control Module (PCM) self-test. If no DTCs are retrieved, go to next step. If any Diagnostic Trouble Codes (DTC) are retrieved, perform appropriate test in accordance with DTC retrieved. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
Turn ignition off. Disconnect NGS tester and generator 3-pin harness connector. Turn ignition on. Connect a fused (15-amp) jumper wire between generator harness connector terminal No. 2 (Light Blue/Red wire) and ground. If warning indicator does not illuminate, go to next step. If warning indicator illuminates, replace generator. See GENERATOR under REMOVAL & INSTALLATION.
Turn ignition off. Disconnect PCM connector C175. Measure resistance between PCM connector C175 terminal No. 45 and Light Blue/Red wire terminal at generator connector. See Figure. If the resistance is less than 5 ohms, go to next step. If the resistance is 5 ohms or more, repair open in Light Blue/Red wire. Test the system for normal operation.
Disconnect PCM harness connector C175. Inspect harness connector for pushed out pins, corrosion or bent terminals. Repair as necessary. If harness connector is okay, reconnect and retest system operation. If fault is still present, replace PCM. Clear DTCs and repeat PCM self-test. If fault is still not present, system is operating correctly at this time.