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 MANUALSFORD2021TRANSIT-350 HD BASE, VAN CARGO EXTENDED, 3.5L ENG VIN 8, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 593 (ELECTRONIC ENGINE CONTROLS - 3.0L POWER STROKE DIESEL)DIAGNOSIS AND TESTINGPOWERTRAIN CONTROL MODULE (PCM) INPUT AND OUTPUT CONTROLSPINPOINT TESTSPINPOINT TEST AJ: POWERTRAIN CONTROL MODULE (PCM) POWER RELAY
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWD
Pinpoint Test AJ: Powertrain Control Module (Pcm) Power Relay
2021 Ford Transit-350 HD Base, Van Cargo Extended, 3.5L Eng VIN 8, AWDSECTION Pinpoint Test AJ: Powertrain Control Module (Pcm) Power Relay
WARNING: This page is about a different car, the 2021 Ford F-150. 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.
Normal Operation and Fault Conditions
Refer to the DTC Fault Trigger Conditions.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| PCM P0685:00 | ECM/PCM Power Relay Control Circuit/Open: No Sub Type Information | Sets when the PCM detects the ignition switch position run (ISP-R) circuit indicates the ignition is in the off or accessory mode, and the amount of time the PCM remains powered through the PCM power relay exceeds a predetermined amount of time. |
| PCM P068A:00 | ECM/PCM Power Relay De-Energized - Too Early: No Sub Type Information | Sets when the PCM detects the PCM power relay is de-energized too early. |
| PCM P068B:00 | ECM/PCM Power Relay De-Energized - Too Late: No Sub Type Information | Sets when the PCM detects the PCM power relay takes longer than a specified time threshold to de-energize after it was commanded off. |
| PCM P2507:00 | ECM / PCM Power Input Signal Low: No Sub Type Information | Sets when the PCM detects the PCM 5 volt power supply voltage is less than a calibrated threshold. |
| PCM P2508:00 | ECM / PCM Power Input Signal High: No Sub Type Information | Sets when the PCM detects the PCM internal 5 volt power supply voltage is greater than a calibrated threshold. |
Possible Sources
- Charging system concern
- PCM power relay control circuitry concern
- PCM power relay (12A646)
- PCM (12A650)
PINPOINT TESTS AJ: POWERTRAIN CONTROL MODULE (PCM) POWER RELAY (Diesel)
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.