Chevrolet 12554145 Sensor,Engine Coolant Temperature Gage

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Various engine sensors and components have checking procedures,the engine coolant temperature (ECT) sensor is a thermistor that changes resistance with temperature, and a failure in the circuit can cause trouble codes. The resistance should be measured when cold and warm while ensuring reference voltage from PCM is around 5.0 volts for the verification. Manifold Absolute Pressure (MAP) Sensor monitors changes in intake manifold pressure then varies its voltage output accordingly. Look at the reference voltage and signal voltage with the ignition on and engine off, and observe voltage changes as the engine's vacuum changes. Intake Air Temperature (IAT) Sensor acts as a thermistor where you can measure its resistance at different temperatures to make sure it changes as expected. Also, use a scan tool to monitor the IAT sensor for performance. The oxygen sensor in exhaust detects oxygen content which you can check its millivolt signal while warming up your engine. Check whether the oxygen sensor heater has correct voltage or not. Vehicle Speed Sensor (VSS) provides speed data to PCM which can be checked for reference voltage. Depending on the type of engine, Camshaft Sensor and Crankshaft Sensor should be checked for resistance and proper signal output. Finally, Knock Sensors detect engine knock which should be checked for reference voltage and resistance. If any component fails these checks, replacement may be necessary.

Make sure to install the new unit to prevent any loss of coolant. Connect the wire. Install the engine cover.

Ensure that the engine is cool and be prepared to catch any coolant loss.

Before checking the engine coolant temperature sensor, it is important to check the voltage supply and ground circuits from the ECM/PCM.

The circuit can be tested by briefly grounding the wire to the sending unit while the ignition is on.

Refill the cooling system.

Before installing the new sensor, wrap the threads with Teflon sealing tape to prevent leakage and thread corrosion.

Coat the threads of the new sending unit with sealant.

The camshaft sensor and crankshaft sensor, depending on the engine type, should be checked for resistance and proper signal output.

Verify the proper operation of the gauge and sending unit.

The coolant temperature indicator system consists of a temperature gauge and a coolant temperature sending unit.

Check the coolant level and top up the system if needed.