Start the engine and check the voltage while the engine warms up.Disconnect the sensor and use a test light to check if there is voltage on the signal wire.Locate the coolant temperature sensor wiring in the electrical circuit diagram.If the resistance readings are outside the specified range, the sensor is likely faulty and needs to be replaced.You can compare the readings with the specifications for the sensor, or check the sensor resistance while heating it with a hot air gun and compare it to the resistance at room temperature. The resistance of the sensor should change as the engine temperature changes.Set the multimeter to measure resistance (ohms) and connect the leads to the sensor terminals.Turn off the engine and disconnect the electrical connector from the sensor.There are two common methods to test a coolant temperature sensor:
This warning light is typically accompanied by one or more of the following symptoms: engine performance issues, fuel efficiency issues, engine overheating, and engine stalling. 96 LT1 thermostat temperature sensor and temperature problems What is the most common symptom?Īn illuminated engine warning light on the dashboard is the most common symptom of a failing coolant temperature sensor in an LT1 engine.
