Pinpoint Test B: Powertrain Control Module (PCM) Power Relay: Introduction

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)

Fig 1: Fuel Injector Connector

Courtesy of FORD MOTOR CO.

FUEL INJECTOR CONNECTOR PINS REFERENCE CHART

Pin	Circuit
2	IGN START/RUN (Ignition START/RUN)

Fig 2: Powertrain Control Module Power (PCM Power) Relay Connector

Courtesy of FORD MOTOR CO.

PCM RELAY CONNECTOR PINS REFERENCE CHART

Pin	Circuit
5	VPWR (Vehicle Power)
2	PCMRC (PCM Relay Control)
1, 3	B+ (Battery Positive Voltage)

Fig 3: SJB_E Assembly Connector

Courtesy of FORD MOTOR CO.

SJB_E ASSEMBLY CONNECTOR PINS REFERENCE CHART

Pin	Circuit
9	ISP-R (Ignition Switch Position Run)

Fig 4: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

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)