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.

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

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

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-150	A	47, 61, 62, 76, 77 67, 68, 69 21 50	PWRGND VPWR ISP-R PCMRC
Transit Connect	B	96, 97, 98 101, 102, 103 82 42	VPWR ISP-R PCMRC
All other vehicles	A	47, 61, 62, 76, 77 1, 16, 17, 2 21 50	PWRGND VPWR ISP-R PCMRC

Fig 3: Battery Junction Box-B (BJB-B) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
46	VPWR (Vehicle Power)

Fig 4: Battery Junction Box-C (BJB-C) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
20	PCMRC (PCM Relay Control)

Fig 5: Battery Junction Box-A (BJB-A) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
51	VPWR (Vehicle Power)
39	PCMRC (PCM Relay Control)

Fig 6: Battery Junction Box-G (BJB-G) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
34	VPWR (Vehicle Power)

Fig 7: Battery Junction Box-H (BJB-H) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
18	PCMRC (PCM Relay Control)