Overview Of ECC System

Overview of ECC system









ECC control panel is located directly on the control module.
The passenger compartment temperature sensor is an NTC-resistor located behind the left grill directly beside the recirculation button. The passenger compartment air is taken in through this grill. For this reason there is an extra venturi in the channel to the heater. The vacuum that is created by this venturi sucks air out of the passenger compartment along the temperature sensor. The control module calculates the difference between measured air temperature and set temperature.

Other input signals - received directly from the control panel:
- Passenger compartment temperature sensor
- Temperature setting control
- Rotary control for air distribution
- Fan control
- AC selector
- Recirculation button
The alternator's charging signal is a signal that establishes if the engine is running. It is used for the fan. If the engine is not running but the ignition is on, the fan will not be run if AUTO has been selected. This is to prevent the battery from being drained.






Additional conditions for engaging the compressor
Engine control module (ECM) will not transmit an incoming request if:
- coolant temperature is above 125 °C (257 °F)
- pressure in AC system is lower than 200 kPa (29 psi) or higher than 3000 kPa (435 psi).
- full throttle (WOT) is applied (for 10 seconds)
If the Engine control module (ECM) fulfills the AC request, it sends a signal to the compressor (8) via a relay.