Coolant Temperature Sensor/Switch (For Computer): Service and Repair

REMOVING AND INSTALLING/CHECKING COOLANT TEMPERATURE SENSOR





- The temperature Sensor measures engine temperature and sends this information to the control unit in the form of a resistance value.
- The resistance value drops as temperature rises (NTC).
1 = Plug connection
2 = Housing
3 = NTC resistor

Removing and Installing:





- Pull off plug (1).
- Unscrew temperature sensor.

Installation Note:
- Tightening torque 12 to 14 Nm(9 to 10 ft.lbs.).

Installation Note:





- Check code number (1).
- Replace seal (2).
- FD = Manufacturing date
- Fill and bleed cooling system.

Checking:





- Connect Jetronic test lead 61 1 440.
- Check nominal value with ohmmeter.
- To check the entire temperature range, remove and place temperature sensor in a water bath heated to testing temperature.
- Check resistance with an ohmmeter.