Pinpoint Tests 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: Identifying Fuel Injector Connector
Courtesy of FORD MOTOR CO.

Powertrain Control Module Power (PCM Power) Relay Connector

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

Courtesy of FORD MOTOR CO.

Fig 3: Identifying SJB-A Connector

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.