Contents: Possible malfunctions 🠛 Troubleshooting 🠛
Depending on the engine type, the coolant temperature sensor can be installed in different places on the engine body. On a type "C" engine (drawing on the left) the sensor is screwed behind the coolant pump in the cylinder head. On the "F" type engine (in the picture on the right is a turbodiesel) the sensor is located on the side, behind the thermostat housing, in the cylinder head.
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The coolant temperature indicator works in the same way as the fuel level indicator in the tank. The device receives a positive electric current charge when the ignition is on, the connection to the ground is carried out by the temperature sensor in the cylinder head. This sensor is a variable resistance, which decreases its value with increasing heating, while the increase in electric current in the coils strengthens the magnetic field and the arrow deflects.
Possible malfunctions
- Readings too high or too low: faulty sensor, wiring or pin connection not connected correctly or faulty meter itself (the arrow is hanging, etc.). It is possible that the arrow itself is installed incorrectly, and then its readings should have been erroneous from the beginning of operation.
- No readings: wiring is damaged, temperature sensor or indicator is faulty.
Troubleshooting
1. Check the temperature sensor: disconnect the orange-green wire from the temperature sensor and connect it to ground.
2. Turn on the ignition; if the arrow starts moving, it means the temperature sensor is faulty.
3. Check the indicator: remove the combination instrument and disconnect the connector.
4. Connect the contact tab for the orange-green wire to the positive terminal of the battery, and the contact tab for the black cable to the negative terminal. If the arrow does not move, the indicator is faulty.
5. If the arrow is completely deflected, it is necessary to find a break in the wiring.