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 MANUALSFORD2018F-450 SUPER DUTY LARIAT, 4D PICKUP CREW CAB, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - PINPOINT TESTS (DIESEL)PINPOINT TESTS AJ: POWERTRAIN CONTROL MODULE (PCM) POWER RELAYINTRODUCTION
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WD
Pinpoint Tests AJ: Powertrain Control Module (Pcm) Power Relay: Introduction
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WDSECTION 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)
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| F-150 | A | 5 2 1, 3 |
VPWR PCMRC B+ |
| All other vehicles | B | 5 2 1, 3 |
VPWR PCMRC B+ |
| Vehicle | Connector | Pin | Circuit |
|---|---|---|---|
| F-150 | A | 73, 72, 71, 70 69, 68, 67 42 38 |
PWRGND VPWR ISP-R PCMRC |
| Transit | B | 2, 3, 42, 53, 7 17, 29, 5 39 48 |
PWRGND VPWR ISP-R PCMRC |
| All other vehicles | A | 70, 71, 72, 73, 74 67, 68, 69 42 38 |
PWRGND VPWR ISP-R PCMRC |
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.