If the ECT voltage signal is equal to 0V (lack of power supply or there is a short circuit to the ground) or if it is 5.0V - we have an open circuit.If such defect is found, the ECT sensor must be replaced. This will not generate any fault codes (if the onboard controller is not programmed to detect voltage changes) since the sensor continues to operate within its design parameters. A defect sensor can indicate a voltage of 1.5V at cold engine and 1.25V at warm engine, thus causing difficulties of starting a cold engine and a presence of rich fuel mixture when the engine is warm. The normal value of the ECT sensor voltage is 2V at cold engine and 0.5V at warm engine. Common problem is that the output resistance (and voltage) changes incorrectly beyond its normal range.During engine warming the voltage should decrease in accordance with the values given in Table-1. Start the engine and warm it to the operating temperature.You will need a thermometer for the purpose. Check whether the ECT voltage signal corresponds to the temperature.The relationship between the voltage and the temperature is shown in Table-1. Depending on the temperature, voltage readings should be in the range of 2V to 3V.Connect the positive wire of the voltmeter is to the ECT signal terminal.Determine which are the signal and the ground terminals. ![]()
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