If, when the engine overheats in models with diesel engines, the arrow of the coolant temperature gauge does not go to the right, you need to check the coolant temperature gauge sensor.
Order of execution
1. Disconnect the wiring harness from the coolant temperature sensor.
Models with petrol engines
2. Connect the yellow-blue wire to «mass» using an additional wire and turn on the ignition. If the coolant temperature warning lamp in the instrument cluster comes on, the sensor is defective and must be replaced.
3. If the lamp does not light up, check it. To do this, you need to remove the instrument cluster (cm. subsection 12.1.5.15).
4. If the lamp does not burn out, check the electrical circuit. To do this, disconnect the wire from «negative» battery terminals. Then disconnect the 12-pin connector (1) from the instrument cluster (2) and check the resistance of the circuit with an ohmmeter by connecting it to the contact «2» pads 1 and yellow-blue wire connected to the sensor. The resistance must be zero. If it is equal to infinity, there is an open in the circuit.
Models with diesel engines
5. Connect the yellow-blue wire to «mass» using an additional wire and turn on the ignition. If the arrow on the coolant temperature indicator on the instrument cluster deviates to the right, then the sensor is faulty and must be replaced.
6. If the arrow does not deviate to the right, you need to check the electrical circuit. To do this, disconnect the wire from «negative» battery terminals. Then disconnect the 12-pin connector from the instrument cluster and check the resistance of the circuit with an ohmmeter by connecting it to the contact «2» pads and a yellow-blue wire connected to the sensor. The resistance should be equal to zero, if it is equal to infinity, there is an open circuit in the circuit.
7. If there is no open in the circuit, then the fuel gauge is faulty and needs to be replaced.
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