Coolant temperature sensor — performance check and replacement

1. The coolant temperature control system consists of an indicator (or emergency lamp), which is located on the instrument panel, and a sensor installed on the engine. On the described vehicles, the coolant temperature sensor is an information sensor for the fuel and exhaust system (see chapter 6), as well as a device for determining the coolant temperature.

2. When the engine overheat indicator is triggered, check the coolant level in the system, and then make sure that the circuit connectors between the temperature sensor and the indicator are reliable.

3. Check the functionality of the sensor (see chapter 6). If the sensor is inoperative, replace it as described in this chapter.

4. If the temperature sensor is working properly, diagnose the measuring unit at a proprietary or other specialized station. To carry out diagnostics, an electronic scanner is required, since the sensor is directly connected to the operation of the microprocessor of the PCM control system.