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...