PINPOINT TEST B: Powertrain Control Module (PCM) Power Relay: Introduction

NOTE: The IGN START/RUN and ground circuits, or the B+ and VPWR circuits may be reversed in the harness connector. Refer to the Wiring Diagrams article Electronic Engine Control for schematic and connector information.

This pinpoint test is intended to diagnose the following:

harness circuits: B+, IGN START/RUN, INJPWRM, ISP-R, PCMRC, VPWR and GND
PCM power relay (12A646)
PCM (12A650)

Fig 1: Injector (INJ) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Fusion 3.0L, Milan 3.0L	A	1	VPWR
All other vehicles	A	2	VPWR

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

Courtesy of FORD MOTOR CO.

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

Courtesy of FORD MOTOR CO.

Fig 4: Powertrain Control Module Power (PCM Power) Relay Connector - C

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Crown Victoria, Escape/Mariner, Grand Marquis	A	5 2 1 3	VPWR GND IGN START/RUN B+
Expedition, F-Super Duty, Fusion, Milan, MKZ, Navigator, Sable, Taurus, Taurus X	B	87 86 30, 85	VPWR PCMRC B+
Explorer, Explorer Sport Trac, Mountaineer	B	87 85 30, 86	VPWR PCMRC B+
F-150, Mark LT	A	5 1 2, 3	VPWR PCMRC B+
Focus	A	3 2 1, 5	VPWR PCMRC B+
Mustang	C	87 85 30, 86	VPWR PCMRC B+
All other vehicles	B	87 85 86 30	VPWR GND IGN START/RUN B+

Vehicle	Connector	Pin	Circuit
Edge, MKX, Sable, Taurus, Taurus X	190 Pin	B33 B51, B52, B53 B7 B8	INJPWRM VPWR ISP-R PCMRC
Escape/Mariner	150 (50-50-50) Pin	B35, B36	VPWR
Expedition, Navigator	140 Pin	B33 B51, B52, B53 B7 B8	INJPWRM VPWR ISP-R PCMRC
Explorer, Explorer Sport Trac, Mountaineer	170 Pin	B35, B36 B46 B37	VPWR ISP-R PCMRC
F-150 4.6L, F-150 5.4L, Mark LT	190 Pin	B51, B52, B53 B17 B40	VPWR ISP-R PCMRC
F-150 4.2L	190 Pin	B33 B51, B52, B53 B17 B40	INJPWRM VPWR ISP-R PCMRC
F-Super Duty	170 Pin	E23 B35, B36 B31 B37	INJPWRM VPWR ISP-R PCMRC
Focus	190 Pin	B21 B67, B68 B42 B38	INJPWRM VPWR ISP-R PCMRC
Fusion, Milan, MKZ	140 Pin	B45 B51, B52 B37 B35	INJPWRM VPWR ISP-R PCMRC
Mustang	170 Pin	E23 B35, B36 B46 B37	INJPWRM VPWR ISP-R PCMRC
All other vehicles	170 Pin	B35, B36	VPWR