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 TESTSKM - WOT A/C CUT-OFF (WAC) A/C DEMANDKM5 - CHECK WAC CIRCUIT FOR SHORT TO GROUND
1994 Ford F 250 2WD Pickup L6-300 4.9L
KM5 - Check WAC Circuit For Short to Ground
1994 Ford F 250 2WD Pickup L6-300 4.9LSECTION KM5 - Check WAC Circuit For Short to Ground
- Key "OFF".
- Wide Open Throttle A/C Cut-Off (WAC) relay disconnected.
- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary. Leave PCM disconnected.
- Measure resistance between WAC circuit at the WAC relay vehicle harness connector and chassis ground.
- Is resistance greater than 10,000 ohms?
Yes -- Go to KM6. KM6 - Check For Voltage at ACCS/ACD Input to PCM
No -- Service short circuit. Reconnect all components. 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.