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Home >> Lexus >> 1991 >> ES 250 Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Miscellaneous Controls >> A/C Clutch

A/C Clutch

When the ECU detects a signal from the air conditioner ECU that the air conditioner switch is turned on, the ECU outputs a signal to the magnetic clutch relay, turning it on.

The magnetic clutch operation is delayed about 0.5 second. During this time, the ECU opens the ISC valve to offset the drop in engine RPM due to the operation of the air conditioner compressor.

This system also helps maintain driveability by switching off magnetic compressor clutch when the vehicle is accelerated suddenly, or when engine is running under a heavy load condition.

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