Ground Circuits
WARNING: This page is about a different car, the 2003 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition off. Disconnect compuvalve 64-pin connector. Compuvalve is located in right rear corner of engine compartment. Using DVOM, check for continuity between chassis ground and compuvalve connector terminals No. 57, 59, 61, 62, 63 and 64. See Fig 1. If continuity exists, go to next step. If continuity does not exist, repair open in affected ground circuit. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.