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.
Circuit Description
This test monitors the ECT sensor for high engine temperature condition. If a high engine temperature condition exists, it will either disable the A/C compressor (if engaged) or will not allow compressor operation if requested. After the diagnostic test fails and is set current, it uses a lower temperature cut-off point to ensure that the A/C system will not be a load on the cooling system during conditions of high engine temperature.
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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.