Pinpoint Test B: Powertrain Control Module (PCM) Power Relay: Introduction
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE HYBRID SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.
This pinpoint test is intended to diagnose the following:
- harness circuits: B+, IGN START/RUN, INJPWRM, ISP-R, ISP-R/S, PCMRC and VPWR
- PCM power relay (12A646)
- PCM (12A650)
FUEL INJECTOR CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 2 | IGN START/RUN (Ignition START/RUN) |
PCM RELAY CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 5 | VPWR (Vehicle Power) |
| 2 | PCMRC (PCM Relay Control) |
| 1, 3 | B+ (Battery Positive Voltage) |
SJB_E ASSEMBLY CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| 9 | ISP-R (Ignition Switch Position Run) |
PCM CONNECTOR PINS REFERENCE CHART
| Pin | Circuit |
|---|---|
| B67, B68 | VPWR (Vehicle Power) |
| B21 | INJPWRM (Injector Power Monitor) |
| B39 | ISP-R/S (Ignition Run/Start Input) |
| B38 | PCMRC (PCM Relay Control) |
| B42 | ISP-R (Ignition Switch Position Run) |