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 MANUALSFORD1994F 150 4WD PICKUP V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X49 - CHECK OPERATION OF PFC RELAY
1994 Ford F 150 4WD Pickup V8-351 5.8L
X49 - Check Operation of PFC Relay
1994 Ford F 150 4WD Pickup V8-351 5.8LSECTION X49 - Check Operation of PFC Relay
- Key "OFF".
- Reconnect Pusher Fan Control (PFC) relay.
- Pusher fan disconnected.
- Again, enter Output State Diagnostic Test Mode. Output State Diagnostic Test Mode
- Outputs "OFF".
- Command the PFC output "ON" by depressing the throttle, near Wide Open Throttle (WOT), waiting for the Malfunction Indicator Light (MIL) to flash three consecutive times (about 20 seconds), then releasing the throttle.
- Measure voltage between the Power-To-Pusher Fan circuit at the pusher fan vehicle harness connector and the battery negative post.
- Is voltage greater than 10.5 volts?
Yes -- Exit Output State test mode. Key "OFF". Replace pusher fan. Re-evaluate symptom.
No -- Verify test results. If voltage is still less than 10.5 volts, exit Output State test mode. Key "OFF". Replace PFC relay. Reconnect pusher fan. Re-evaluate symptom.
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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.