Temperature Gauge -- S23-S25

Fault tracing, Gauges

Temperature gauge, fault tracing S23
1982-1984



- See if the fuel gauge is also reading incorrectly.
If both are reading incorrectly the voltage stabilizer is most likely faulty as per S26.
If the fuel gauge is showing correctly, check the temperature gauge with a test resistor as per S24

Temperature gauge, fault tracing S24
1985-1986



Test the temperature gauge with a test resistor of 68 Ohm, P/N 999 5824-1.
- Disconnect battery negative lead.
- Disconnect lead from sensor.
- Connect the test resistor between ground and the disconnected lead.
- Reconnect the battery negative lead and turn on the ignition.




A gauge which is functioning correctly should show 3/4 full. Tolerance: breadth of the pointer. See illustration.
If the gauge shows correctly, the sensor is faulty.
If the gauge shows incorrectly the gauge itself is faulty.
- Fit new unit.

- If there is no reading at all, check the lead.
- Check continuity in the lead with an ohmmeter.

- If the lead is OK, replace the gauge.

Temperature gauge, fault tracing S25
1987-



Check temperature gauge with a test resistor of 68 ohm, P/N 999 5824-1.
- Disconnect battery negative lead.
- Unplug connector at sensor.
- Connect the test resistor between the two terminals in the connector.
- Replace battery negative lead and turn on ignition.




If the gauge is working correctly, the pointer should be in the middle of the red zone. See illustration.
Tolerance: breadth of the pointer.
- If the gauge shows correctly. the sensor is faulty.
- If the gauge shows incorrectly. the gauge itself is faulty

- Measure the resistance of the sensor.
When engine is warm: 100-260 ohm.
When engine is cold: 780 ohm.

If the gauge does not register at all. check the lead. Check for continuity in the lead with an ohmmeter.
- If the lead is OK replace the gauge.
- Test.