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.
Pinpoint Tests AJ: Powertrain Control Module (PCM) Power Relay: Introduction
2021 Ford Edge SE, 4WDSECTION Introduction
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2022 Ford F-550 Super Duty, 2022 Ford F-450 Super Duty, 2022 Ford F-350 Super Duty, 2022 Ford F-250 Super Duty, and 2021 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
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)
| Pin | Circuit |
|---|---|
| 5 | VPWR (Vehicle Power) |
| 2 | PCMRC (PCM Relay Control) |
| 1, 3 | B+ (Battery Positive Voltage) |
| 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 |
| Pin | Circuit |
|---|---|
| 46 | VPWR (Vehicle Power) |
| Pin | Circuit |
|---|---|
| 20 | PCMRC (PCM Relay Control) |
| Pin | Circuit |
|---|---|
| 51 | VPWR (Vehicle Power) |
| 39 | PCMRC (PCM Relay Control) |
| Pin | Circuit |
|---|---|
| 34 | VPWR (Vehicle Power) |
| Pin | Circuit |
|---|---|
| 18 | PCMRC (PCM Relay Control) |
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.