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 MANUALSMERCURY2004SABLE V6-3.0L DOHC VIN SREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE FULL OPEN SWITCHDESCRIPTION AND OPERATION
2004 Mercury Sable V6-3.0L DOHC VIN S
Throttle Full Open Switch: Description and Operation
2004 Mercury Sable V6-3.0L DOHC VIN SSECTION Description and Operation
WIDE OPEN THROTTLE A/C CUT-OFF (WAC)
The wide open throttle A/C cutoff relay (may be referred to as the A/C clutch relay) is wired normally open (normally closed for Aviator). There is no direct electrical connection between the A/C switch or EATC Module and the A/C clutch. The PCM will receive a signal indicating that A/C is requested (for some applications, this message is sent through the BUS + and BUS - circuits). When A/C is requested, the PCM will check other A/C related inputs that are available (such as ACP (SW), ACCS). If these inputs indicate A/C operation is OK, and the engine conditions are OK (such as coolant temperature, engine rpm, throttle position), the PCM will ground the WAC output (unground for Aviator), closing the relay contacts and sending voltage to the A/C clutch.
The wide open throttle A/C cutoff relay (may be referred to as the A/C clutch relay) is wired normally open (normally closed for Aviator). There is no direct electrical connection between the A/C switch or EATC Module and the A/C clutch. The PCM will receive a signal indicating that A/C is requested (for some applications, this message is sent through the BUS + and BUS - circuits). When A/C is requested, the PCM will check other A/C related inputs that are available (such as ACP (SW), ACCS). If these inputs indicate A/C operation is OK, and the engine conditions are OK (such as coolant temperature, engine rpm, throttle position), the PCM will ground the WAC output (unground for Aviator), closing the relay contacts and sending voltage to the A/C clutch.
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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.