Attention! Proceed with the procedure only after the engine has completely cooled down! See also the warnings at the beginning of the Section Antifreeze - general information. Remember that when the ignition is on, the cooling fan may operate even when the engine is turned off.
Examination
1. If the coolant temperature gauge fails, first check the condition of the relevant fuses (see Onboard electrical equipment).
2. If the meter detects engine overheating, refer to the Section dedicated to the diagnosis of malfunctions of vehicle components and systems during Administered to this guide.
3. If the meter detects overheating with a definitely cold engine, disconnect the electrical wiring from the meter sensor. If, after disconnecting the wiring, the meter readings fall, replace the sensor, otherwise, check the wiring in the section of the circuit between the sensor and the meter for signs of a short circuit to ground.
4. If the meter does not function at all with good fuses (the arrow remains stationary even after a 10-minute warm-up of the engine), stop the engine and disconnect the electrical wiring from the temperature sensor. Use a jumper wire to connect the sensor wire to ground. Turn on the ignition for a short time without starting the engine - if the indicator needle deviates to the end of the scale, replace the sensor.
Attention! Do not leave the sensor connected longer than is really necessary for testing!
5. If the sensor does not respond to the connection in any way, check for an open circuit in the wiring. The possibility of failure of the meter itself is also not ruled out.
Replacement
1. Remove the throttle body cover and intake duct flange from the throttle body. Then remove the throttle body flange from the intake manifold.
2. Disconnect the wiring from the sensor.
3. Use a tall socket to unscrew the old sensor from the block (prepare to collect spilled liquid).
4. Screw in a new sensor with the required force in place of the removed sensor, the threads of which must first be lubricated with conductive sealant (not teflon tape or fum tape). Connect electrical wiring.
5. Fill the cooling system and check that the temperature gauge is working properly.