The coolant temperature indicator works exactly like the fuel level indicator in the tank. The device receives a positive charge of electric current when the ignition is on, the connection to ground is made by a temperature sensor in the cylinder head. This sensor is a variable resistance, which decreases its value with increasing heating, while an increase in electric current in the coils enhances the magnetic field and the arrow deviates.
Possible malfunctions
- Reading too high or too low: Faulty sensor, wiring or pin connection incorrectly connected or the device itself is faulty (hanging arrow, etc.). It is possible that the arrow itself is incorrectly installed, and then its readings should have been erroneous from the beginning of operation.
- No readings: broken wiring, faulty temperature sensor or indicator.
Troubleshooting
1. Check the temperature sensor: disconnect the orange-green wire from the temperature sensor and connect to ground.
2. Turn on the ignition; if the arrow starts to move, then the temperature sensor is faulty.
3. Check the indicator: remove the combined instrument panel and disconnect the connector.
4. Connect the tab for the orange/green wire to the battery positive, the tab for the black cable to the negative pole. If the arrow does not move, then the indicator is faulty.
5. With a full deviation of the arrow, it is necessary to find a break in the wiring.