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
PCM can determine if A/C clutch is engaged or disengaged through the A/C clutch status line. If PCM has grounded the A/C relay control circuit, current can flow through the A/C relay to A/C compressor clutch and back to the PCM on the A/C status circuit.
As compressor cycles on and off, PCM will record A/C refrigerant pressure from the refrigerant pressure sensor. If PCM does not detect an increase from the refrigerant pressure sensor when A/C clutch cycles back on, DTC will set. This condition can occur if A/C refrigerant pressure sensor is fixed at one value.
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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.