Coolant temperature

The coolant temperature sensor is installed in the coolant pipe on the cylinder head. It measures the coolant temperature, and supplies a signal to the engine control unit. The sensor is a thermistor sensitive to the temperature change. The electrical resistance of the sensor decreases with increasing temperature. The computer determines the temperature of the coolant largest voltage sensor signal and sets the optimum leaner mixture when the engine is warming up (Fig. 2.184).

Immerse sensor in hot coolant (Fig. 2.185).

Check whether the resistance of the sensor is normal.

The sensor resistance:

- At 60 ?� C: 123,8-172,8 ohms;

- At a temperature of 115 ?� C: 23,5-29,5 ohms.

Setting

Check that the thermostat is properly installed in the housing and the flange fits tightly to the body at the installation site.

Install the inlet of the cooling system with a new seal.

Fill the cooling system clean coolant.

Tightening torque, coolant temperature: 20-40 Nm.