6. ECT Sensor Operation
NOTE:
For this test to be valid, the thermostat must be operating correctly.
NOTE:
This test works best if performed on a cold engine (cold soak)
Turn the engine off.
Turn the ignition on.
With the DRB III(R), read the Engine Coolant Temperature (ECT) Sensor value. If the engine was allowed to sit overnight (cold soak), the temperature value should be a sensible value that is somewhere close to the ambient temperature.
NOTE:
If engine coolant temperature is above 82°C (180°F), allow the engine to cool until 65°C (150°F) is reached.
Start the engine.
During engine warm-up, monitor the ECT Sensor value. The temperature value change should be a smooth transition from start up to normal operating temperature 82°C (180°F). The value should reach at least 82°C (180°F).
Did the ECT value increase with a smooth transition and did it reach at least 82°C (180°F)?
- Yes >> Go To 7
- No >> Replace the Engine Coolant Temperature Sensor. See COOLING SYSTEM (MECHANICAL) article.