Pinpoint Test 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: Identifying PCM Power Relay Connector

Courtesy of FORD MOTOR CO.

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

Fig 2: Identifying Powertrain Control Module-B (PCM-B) Connector

Courtesy of FORD MOTOR CO.

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