Ground Circuits
WARNING: This page is about a different car, the 2002 Mercury Villager. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Locate PCM behind top right side of instrument panel, behind glove compartment. Using a DVOM, check continuity between ground and appropriate PCM connector terminals. See IDENTIFYING PCM GROUND TERMINALS table. See Figure. If continuity does not exist, repair open ground circuit as necessary. If continuity exists, go to next step.
- Touch negative lead of voltmeter to a good ground. With vehicle running, backprobe positive lead of voltmeter to each ground terminal. Voltmeter should indicate less than one volt. If reading is greater than one volt, check for open, corrosion or loose connection on ground lead.IDENTIFYING PCM GROUND TERMINALS
PCM Terminal No. Wire Color 10, 19, 96 & 104 Black 39 & 45 Black/Red