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 MANUALSFORD1994AEROSTAR AWD V6-245 4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSX - CONSTANT CONTROL RELAY MODULE (CCRM)X74 - CHECK FUEL PUMP CIRCUIT FOR SHORT TO POWER
1994 Ford Aerostar AWD V6-245 4.0L
X74 - Check Fuel Pump Circuit For Short to Power
1994 Ford Aerostar AWD V6-245 4.0LSECTION X74 - Check Fuel Pump Circuit For Short to Power
- Key "OFF".
- Breakout box installed, Powertrain Control Module (PCM) disconnected.
- Constant Control Relay Module (CCRM) disconnected.
- Key "ON".
- Measure voltage between test pin 22 and the battery negative post.
- Is voltage less than 1.0 volt?
Yes -- Go to X75. X75 - Check Fuel Pump Circuit For Short to Ground
No -- Service short to power. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
If Diagnostic Trouble Code (DTC) 556/557 is still present, replace PCM.
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.