Pinpoint Test B: Powertrain Control Module (PCM) Power Relay: Introduction: Notes
WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
This pinpoint test is intended to diagnose the following:
- Harness Circuit(s):
- Vehicle Power.
- Ignition Start/Run.
- PCM Power Relay Ground.
- Battery positive voltage.
- PCM Power Relay (12A646).
NOTE:
The IGN START/RUN and ground circuits, and/or the B+ and VPWR circuits may be reversed in the harness connector. Refer to SYSTEM WIRING DIAGRAMS
for additional information.