For 4JB1 - TC engines
· The compressor clutch Y1 is activated under the following conditions:
- the engine is running;
- the AC switch S101 is "ON";
- the blower switch S3 is switched to position "1" or higher;
- the electronic thermostat K128 enables ground for the compressor relay K6;
· The pressure switch S20 deactivates the compressor clutch Y1 if the pressure in the high pressure side of the air conditioning system falls below 180 kPa (1.8 bar) or raises above 2940 kPa (29 bar).
· The electronic thermostat K128 controls the temperature of the air running through the evaporator by switching off / on the compressor clutch Y1:
If the temperature behind the evaporator falls below 3.5 °C / 38 °F, the compressor relay K6 switches the compressor clutch off.
If the temperature behind the evaporator raises above 5.0 °C / 41 °F, the compressor relay K6 switches the compressor clutch on again.
· A fast idle is obtained by the fast idle control device when the compressor clutch Y1 is activated.