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.