Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSFORD2021F-150 LIMITED, 3.5L ENG VIN 8, RWDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTMEMORY MODULESENGINE CONTROLS - PINPOINT TESTS (EXCEPT DIESEL & HYBRID) (A TO H)PINPOINT TESTS B: POWERTRAIN CONTROL MODULE (PCM) POWER RELAYINTRODUCTION

2021 Ford F-150 Limited, 3.5L Eng VIN 8, RWD

Pinpoint Tests B: Powertrain Control Module (Pcm) Power Relay: Introduction

2021 Ford F-150 Limited, 3.5L Eng VIN 8, RWDSECTION Introduction

This pinpoint test is intended to diagnose the following:

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

Fig 1: Battery Junction Box-A (BJB-A) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
F-Series Super Duty	A	51 39	VPWR PCMRC
Transit	B	42 33	VPWR PCMRC

Fig 2: Battery Junction Box-B (BJB-B) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Aviator, Explorer	A	50 32	VPWR PCMRC
Bronco Sport	B	39 16	VPWR PCMRC
Corsair	B	39 46	VPWR PCMRC
E-Series	B	32	VPWR
Escape/Kuga	B	39 44	VPWR PCMRC
F-150	A	46	VPWR
Transit Connect	B	39 14	VPWR PCMRC

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

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
E-Series	A	18	PCMRC
F-150	B	20	PCMRC

Fig 4: Injector (INJ) Connector

Courtesy of FORD MOTOR CO.

Vehicle	Connector	Pin	Circuit
Bronco Sport, EcoSport, Escape/Kuga 1.5L, KA	A	1	VPWR
All other vehicles	A	2	VPWR

Fig 5: Powertrain Control Module Power (PCM Power) Relay Connector (1 Of 2)

Courtesy of FORD MOTOR CO.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.