A/C Compressor Control Relay

PURPOSE
PCM control of the A/C clutch improves idle quality and performance by:
- Delaying clutch engagement until the idle speed is increased.
- Releasing clutch when idle speed is too low.
- Smooths cycling of the compressor by providing additional fuel at the instant clutch is applied.

OPERATION
Turning "ON" air conditioning supplies CKT 59 battery voltage to the clutch control relay. After a time delay of about 1/2 second the PCM will ground CKT 259 and close the control relay which engages the A/C compressor clutch.