- Petrol engine: Both sensors are screwed into the thermostat housing. From a single-pole sensor, temperature information is transmitted to a temperature gauge on the dashboard. With a defective sensor, the pointer does not show at all or gives incorrect readings. The signal from the two-contact temperature sensor is sent to the control unit of the electronic carburetor or fuel injection device.
- Diesel engine: From pin 1 the signal goes to the coolant temperature gauge, from pin 2 to the heating system.
Checking the coolant temperature gauge sensor
Remove the connector from the temperature sensor. At the same time, pull not by the wires, but by the connector.
Have an assistant turn on the ignition and observe the temperature gauge.
Briefly touch the sensor connector to the mass, while the pointer arrow should move to its maximum position.
If there is no maximum reading, check the reliability of the installation and the contacts of the sensor connector. You should check the electrical wires and connections on the dashboard according to the wiring diagram. If there is a maximum reading, remove and replace the sensor.
Attention: To prevent coolant from escaping when removing the sensor, it must first be partially drained and collected.
Apply sealant to the threads of the sensor, for example, MITSUBISHI 3M-4171.
Screw in and tighten the temperature sensor to 10 Nm. Put on the connector.
Add coolant, see point 3.3.
Make a test drive and check the tightness of the temperature sensor connection.
Checking the coolant temperature sensor in dismantled state
Remove the connector, unscrew the temperature sensor.
Attention: To prevent coolant from escaping when removing the sensor, it must first be partially drained and collected.
Connect an ohmmeter and warm up the temperature sensor in a water bath.
Required value for engines 1.2/ 1.3 / 1.5 / 1.6 l (16 valves): 104±13.5 ohms at 70°C.
Required value for diesel engines:
- Element I: 104±13.5 ohms at 70°C
- Element II: 3.25±0.33 kΩ at 20°C
Apply sealant to the threads of the temperature sensor, for example, MITSUBISHI 3M-4171.
Screw in and tighten to 10 Nm, for diesel engines 30 Nm temperature sensor. Put on the connector.
Add coolant, see point 3.3.
Make a test drive and check the tightness of the temperature sensor connection.
FBC/MPI carburetor temperature sensor test
Remove the connector, unscrew the temperature sensor.
Attention: To prevent coolant from escaping when removing the sensor, it must first be partially drained and collected.
Connect an ohmmeter and warm up the temperature sensor in a water bath.
Required value: 2.45±0.24 kΩ at 20°C, 296±32Ω at 80°C.
Apply sealant to the threads of the temperature sensor, for example, MITSUBISHI 3M-4171.
Screw in and tighten the temperature sensor to 30 Nm. Put on the connector.
Add coolant, see point 3.3.
Make a test drive and check the tightness of the temperature sensor connection.