Air Conditioner Clutch Control

When the PCM receives an A/C request signal it will supply a ground to the A/C control relay allowing the A/C compressor to operate. During the following conditions the PCM will turn off, or shut down A/C operation.
1. If the coolant temperature exceeds 118°C (244°F). A/C will be turned On again when coolant temperature decreases to 113°C (234°F).
2. During periods of wide-open throttle acceleration for up to 15 seconds. (Wide-open throttle is defined as throttle position sensor greater than 95% [automatic transaxle] 90% [manual transaxle]).
3. If vehicle speed is less than 16 km/h (10 mph), manifold air temperature is greater than 45°C (113°F) and throttle position sensor shows an increase greater than 8%, A/C will be shut-off for 0.3 seconds with an automatic transaxle or 1.3 seconds for a manual transaxle.
4. If engine rpm exceeds 6500 rpm, A/C will be turned back on when rpm is less than 4500 rpm for two seconds.
5. If A/C high side exceeds 2758 ± 138 kPa (400 ± 20 psi). A/C will be turned On when A/C high side pressure drops below 1724 ± 345 kPa - (250 ± 50 psi).
6. If ambient temperature, measured at the air temperature sensor, is between 4°C and 20°C (40°F and 68°F) and vehicle speed is greater than zero, the PCM will cycle the A/C compressor once every 90 seconds depending on manifold air temperature and vehicle speed.

CAUTION: The compressor contains a high pressure switch that can turn the clutch off and the PCM will think the compressor is still on. This will affect the Idle Air Control Motor learning process.