What should the return voltage be on an ECT sensor?
What should the return voltage be on an ECT sensor?
The return voltage signal should be around 3 to 4 volts, when the engine is cold. This should gradually drop to 2 volts or less as the engine reaches, normal operating temperature. Finally, no change in the return signal, would indicate a faulty (ECT) sensor.
How is the ECT sensor connected to the PCM?
The ECT sensor is connected to the powertrain control module. The PCM can supply the reference voltage, while another wire is the sensor ground. The reference voltage and the ground wire must be checked. When the resistance of the ECT lowers as the engine warms, the voltage drops as well.
What should the voltage be on the coolant temperature sensor?
Engine Coolant Temperature (ECT) Sensor Voltage – Testing. The reference voltage to the sensor from the (PCM) should be about 5-volts. The return voltage signal should be around 3 to 4 volts, when the engine is cold. This should gradually drop to 2 volts or less as the engine reaches, normal operating temperature.
What should the ECT be when the engine is warm?
Start the engine and warm it to the operating temperature. During engine warming the voltage should decrease in accordance with the values given in Table-1. Common problem is that the output resistance (and voltage) changes incorrectly beyond its normal range. The normal value of the ECT sensor voltage is 2V at cold engine and 0.5V at warm engine.
The return voltage signal should be around 3 to 4 volts, when the engine is cold. This should gradually drop to 2 volts or less as the engine reaches, normal operating temperature. Finally, no change in the return signal, would indicate a faulty (ECT) sensor.
The ECT sensor is connected to the powertrain control module. The PCM can supply the reference voltage, while another wire is the sensor ground. The reference voltage and the ground wire must be checked. When the resistance of the ECT lowers as the engine warms, the voltage drops as well.
Engine Coolant Temperature (ECT) Sensor Voltage – Testing. The reference voltage to the sensor from the (PCM) should be about 5-volts. The return voltage signal should be around 3 to 4 volts, when the engine is cold. This should gradually drop to 2 volts or less as the engine reaches, normal operating temperature.
Start the engine and warm it to the operating temperature. During engine warming the voltage should decrease in accordance with the values given in Table-1. Common problem is that the output resistance (and voltage) changes incorrectly beyond its normal range. The normal value of the ECT sensor voltage is 2V at cold engine and 0.5V at warm engine.
