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 V8-351 5.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONPINPOINT TESTSKM - WOT A/C CUT-OFF (WAC) A/C DEMANDKM32 - CYCLE A/C DEMAND SWITCH
1994 Ford F 250 2WD Pickup V8-351 5.8L
KM32 - Cycle A/C Demand Switch
1994 Ford F 250 2WD Pickup V8-351 5.8LSECTION KM32 - Cycle A/C Demand Switch
- Key "OFF".
- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
- Install breakout box, leave PCM disconnected.
- Digital Volt/Ohm Meter (DVOM) on 20 volt scale.
- Key "ON", engine "OFF".
- Connect DVOM positive test lead to test pin 43 and negative test lead to test pin 40.
- Does voltage cycle high and low when A/C demand switch is cycled?
Yes -- The PCM is receiving the A/C inputs on Pin 10 and Pin 43. Return to Diagnosis by Symptom (Diagnostic Routines) for other possible causes.
No -- Service open in AC Demand (ACD) circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)
RENDER: 1.0x
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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.