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.
X26 - FC/LFC Circuit Fault Isolation Check
1994 Ford Aerostar AWD V6-245 4.0LSECTION X26 - FC/LFC Circuit Fault Isolation Check
- Key "OFF".
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Reconnect Constant Control Relay Module (CCRM).
- Key "ON", engine "OFF".
- Jumper test pin 13 to test pin 40 or 60 at the breakout box.
- Does fan continue to run?
Yes -- Key "OFF". Remove jumper. If Diagnostic Trouble Code (DTC) 563 was also present with the 564, go to X150. X150 - Check HFC Circuit For Short to Ground
If not, replace CCRM. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
No -- Replace PCM. Remove breakout box and jumper. 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.