A/C Compressor Clutch

WARNING: This page is about a different car, the 2002 Isuzu Trooper, 2002 Isuzu Rodeo Sport, 2002 Isuzu Rodeo, 2002 Isuzu Axiom, and 2002 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.

A/C Compressor Clutch relay is located in underhood fuse/relay box. A 12-volt signal is supplied to A/C request input of PCM when A/C is selected through the A/C control switch. A/C compressor clutch relay is controlled through PCM. This allows PCM to modify idle air control position prior to A/C clutch engagement for better idle quality. If engine operating conditions are within their specified calibrated acceptable ranges, PCM will enable the A/C compressor relay. This is done by providing a ground path for the A/C relay coil within the PCM. When A/C compressor relay is enabled, battery voltage is supplied to A/C compressor clutch coil. PCM will enable A/C compressor clutch whenever engine is running and A/C has been requested. PCM will not enable A/C compressor clutch if any of the following conditions are met:

Engine speed is 6315 RPM or more.
ECT is 246°F (119 °C) or more.
Throttle is more than 80% open.