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 MANUALSMERCURY1993SABLE GS, 4D SEDAN, 3.0 U, AXODEREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGERROR CODE DIAGNOSISERROR CODE 05 (SUNLOAD SENSOR)
1993 Mercury Sable GS, 4D Sedan, 3.0 U, AXODE
Error Code 05 (Sunload Sensor)
1993 Mercury Sable GS, 4D Sedan, 3.0 U, AXODESECTION Error Code 05 (Sunload Sensor)
- Disconnect negative battery cable. Unplug wiring harness connectors at sunload sensor and EATC control panel. Check wiring and connectors for continuity, shorts and opens. See WIRING DIAGRAMS . Repair as necessary.
- Sensor is a photodiode and can be checked with an ohmmeter. With harness disconnected, there should be some unspecified resistance present across sensor terminals, depending on amount of light available. If resistance is zero ohms, replace sensor.
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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.