Sensors air conditioning system

Photosensor

The photocell located in the top center of the dashboard.

It has a sensitivity to sunlight element. When illuminated by sunlight sensor generates an electromotive force proportional to the amount of light that is transmitted to the automatic temperature control module, thus compensates solar radiation.

When illuminated by bright sunlight sensors measure the strength of the current between contact "1" and the negative terminal of the battery, as well as between terminal "2" and the positive terminal of the battery.

Make sure that the amperage in bright light than in a dark place.

Coolant temperature

The coolant temperature sensor is connected to the potentiometer drive unit temperature control and is attached to the intake pipe clamp core heat exchanger under the drive bracket.

Two wires are connected to the output of the sensor driven mixer valve with electronic control. It automatically prevents cold air at high speed at low outdoor temperature and the engine cold.

This adjustment is carried out only when the fan switch is set to ?�AUTO?�. Until the coolant temperature reaches 50 ?� C, or the desired temperature will not be equal to or exceeds the air temperature inside the vehicle at +3 ?� C, the cold air will not enter the interior, and the fan will rotate at a low frequency.

In manual mode ?�MANUAL?� corresponds to the frequency of the set position and the fan control at low temperature coolant is not valid.

Remove sensor and immerse it in a container with water.

Gradually heating the water, measure the resistance of the sensor, connect an ohmmeter to contacts "1" and "2" connector.

Resistance at 25 ?� C to be (12.5 ?� 0.5) ohm at a temperature of 69 ?� C - (2,5 ?� 0,3) ohms.

The outdoor temperature sensor

The sensor is mounted on the front of the condenser fan shroud.

As the sensor uses a thermistor whose resistance varies with temperature.

Disconnect the negative battery terminal.

Ohmmeter, measure the resistance of the sensor.

The sensor resistance at 20 ?� C should be (36,5 ?� 2,3) k.

Potentiometer for air mixing door actuator

The electronic damper actuator of the mixer is on the side of the evaporator housing on the part of the driver. The actuator controls the position of the temperature control valve based on a signal from the low-power module FATC. Damper position is changed by a small DC motor. With the axis of the damper is connected to the potentiometer, which provides feedback to the module FATC. Damper actuator of the mixer is carried out on the input information signals of the temperature setting. In accordance with these signals conditioner control module actuates the DC motor and controls the degree of opening of the valve.

Connect a voltmeter to terminals "1" and "6" connector (Fig. 9.9).

Check that the voltage changed depending on the position of the mixer valve, when the position of the switch up and down.

The voltage at the terminals "1" and "6" connector at 17 ?� C (?�cool?�) shall be (0,3 ?� 0,15) V, at a temperature of 32 ?� C (?�hot?�) - (4,7 ?� 0,15) V.

Evaporator temperature sensor

The sensor detects the temperature inside the cooling unit and sends a corresponding signal to the control unit air conditioning.

Remove the evaporator.

Remove the evaporator temperature sensor.

Measure the resistance of the sensor at different temperatures by connecting an ohmmeter to terminals "1" and "2" connector.

Resistance at 0 ?� C, should be 11,1-11,6 kW, at a temperature of 15 ?� C - 5,8-6,1 clod.