Pinpoint Tests AJ: Powertrain Control Module (PCM) Power Relay: Introduction

NOTE: Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.

This pinpoint test is intended to diagnose the following:

harness circuits: B+, ISP-R, PCMRC, VPWR and PWRGND
PCM power relay (12A646)
PCM (12A650)

Fig 1: PCM Power Relay Connector

Courtesy of FORD MOTOR CO.

Fig 2: PCM Power Relay Connector (Component Side)

Courtesy of FORD MOTOR CO.

Harness Side

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

Fig 3: Powertrain Control Module-B (PCM-B) Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
PCMRC (PCM Relay Control)	38
ISP-R (Ignition Switch Position Run)	42
VPWR (Vehicle Power)	69
VPWR (Vehicle Power)	68
VPWR (Vehicle Power)	67
PWRGND (Power Ground)	70
PWRGND (Power Ground)	71
PWRGND (Power Ground)	72
PWRGND (Power Ground)	73
PWRGND (Power Ground)	74