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.
Chart C-10, 2.2L (1 Of 2), A/C Clutch CTRL CKT Diagnosis: Notes
A/C clutch control relay is energized when ECM provides a ground through circuit No. 459 and A/C is requested. A/C clutch is delayed approximately .3 second after A/C is requested. This allows Idle Air Control (IAC) to adjust engine RPM for additional load. ECM will temporarily disengage A/C clutch relay for calibrated times for one or more of following conditions:
- Hot engine restart.
- Wide Open Throttle (WOT).
- Engine RPM more than approximately 5025 RPM.
- During Idle Air Control (IAC) reset.
- ECM will only energize A/C relay when engine is running. This test will determine if relay or circuit No. 459 is faulty.
- Determines if signal is reaching ECM through circuit No. 66 from A/C control panel. Signal should only be present when A/C mode or defrost mode is selected.
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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.
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