Temperature sensor, coolant (ECT)

coolant temperature sensor (EATING) is a thermistor (a resistor with a value that changes as the temperature changes) with a negative temperature coefficient of resistance installed on the engine water jacket. At low temperatures, the sensor has a high resistance (100,000 ohms at 40°C), while at high temperature the resistance decreases (70 ohm at 130°C).

The ECM applies 5 volts to the ECT sensor through the ECM resistor and senses the change in voltage. The coolant temperature affects almost all systems controlled by the ECM.

If there is a malfunction in the ECT sensor circuit, DTC P0117 or P011B will be assigned. It should be borne in mind that the assignment of these DTCs means a failure in the ECT sensor circuit.

Withdrawal

1. Depressurize the cooling system.

2. Disable «-» battery cable.

3. Remove the coolant temperature sensor connector (EATING).

Note: Be careful when handling the coolant sensor. Damage to the sensor will disrupt the fuel injection system.

4. Carefully remove the ECT sensor from the cylinder head under the ignition coil.

Installation

1. Coat the threads of the ECT sensor with sealant.

2. Install the ECT sensor in the cylinder head and tighten the sensor to 20 Nm.

3. Connect the ECT sensor connector.

4. Prime the cooling system.

5. Connect «-» battery cable.