Circuit/System Description

The generator control module also called the starter generator control module is comprised of the following three control modules; the hybrid powertrain control module, 14 volt power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.

The motor temperature sensor is a non-serviceable part of the starter generator assembly, often referred to as the drive motor assembly. The motor temperature sensor is a thermistor, or a resistor that changes value when the temperature changes. The motor temperature sensor is located in the stator. The sensor has a negative-temperature coefficient. This means that as the temperature increases, the resistance decreases, and as the temperature decreases, the resistance increases. The motor control module supplies a 5 V reference signal to the sensor and measures the voltage drop in the circuit. When the motor is cold, the sensor resistance is high. As the motor temperature increases, the resistance of the sensor decreases, which lowers the signal voltage.