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Vehicle Power

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2002 Mercury Sable, 2002 Mercury Mountaineer, 2002 Mercury Grand Marquis, 2002 Mercury Cougar, and 2002 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

When ignition switch is turned to START or RUN position, battery positive voltage (B+) is applied to coil of PCM power relay. Since other end of coil is wired to ground, this energizes coil and closes contacts of PCM power relay. Vehicle power (VPWR) is now sent to PCM and various OBD-II systems.

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