Check the power supply and ground connection for the ECM.Check the connecting wires from the ECM to the sensor.If it reads 0V, this indicates a short circuit or no power supply to the sensor. If the voltmeter reads 5V, it implies an open circuit.The voltage reading should drop (for an NTC sensor) to 1.2V – 0.5V. Let the engine get warmed up to its operating temperature.The reading should be between 3V – 4V, depending on the engine’s temperature. Cold start the engine and check the readings.
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