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 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X13 - CHECK PFC CIRCUIT FOR SHORT TO GROUND
1994 Ford F 150 2WD Pickup L6-300 4.9L
X13 - Check PFC Circuit For Short to Ground
1994 Ford F 150 2WD Pickup L6-300 4.9LSECTION X13 - Check PFC Circuit For Short to Ground
- Key "OFF".
- Pusher Fan Control (PFC) relay disconnected.
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Measure resistance between test pin 34 and test pin 40 at the breakout box.
- Is resistance greater than 10,000 ohms?
Yes -- Go to X14. X14 - Check PFC Circuit Continuity
No -- Service short circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
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.