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 250 2WD PICKUP L6-300 4.9LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X15 - CODE 563: CHECK HIGH FAN CONTROL (HFC) CIRCUIT IN CCRM
1994 Ford F 250 2WD Pickup L6-300 4.9L
X15 - Code 563: Check High Fan Control (HFC) Circuit In CCRM
1994 Ford F 250 2WD Pickup L6-300 4.9LSECTION X15 - Code 563: Check High Fan Control (HFC) Circuit In CCRM
Diagnostic Trouble Code (DTC) 563 indicates a High Fan Control (HFC) primary circuit failure.
Possible causes are:
- Open or shorted circuit.
- Damaged Constant Control Relay Module (CCRM).
- Damaged Powertrain Control Module (PCM).
- Key "OFF".
- Disconnect CCRM.
- Check High Fan Control (HFC) relay resistance in CCRM:
- Measure resistance between Pin 17 and Pin 24 at the CCRM.
- Resistance should be between 50 and 100 ohms.
- Check HFC circuit for shorts in CCRM:
- Measure resistance between Pin 17 and Pins 1 through 8 of the CCRM.
- Also measure resistance between Pin 17 and the CCRM case.
- All resistence should be greater than 10,000 ohms.
- Are all checks OK?
Yes -- Go to X17. X17 - Check HFC Circuit Continuity
No -- Replace CCRM. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
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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.