The motor generator unit (MGU) position sensor is used for determining motor control of the MGU. The motor control consists of the angular position and speed of the MGU. The rotor is bolted on the MGU shaft, the stator is bolted on the MGU bracket and the sensor circuit is soldered on the motor control board in the starter/generator control module (SGCM). The SGCM monitors the position sensor circuit to detect an overspeed condition.

The engine is running.

Absolute motor speed is greater than 21,000 RPM for 10 ms.

Stop PWM (MGU shutdown)

Clears 30 seconds after cycle wake up signal.

Possible motor overspeed.

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Starter/Generator Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Disconnect the MGU X2 and the SGCM X2 connectors. Refer to Generator with Starter Replacement and Generator Control Module Replacement.
2. Test the circuits in the SGCM to MGU Terminal Reference Table as indicated below. Also test these circuits for short to ground.

⇒	If any of the circuits are not within specification, repair the open/high resistance or short to ground.

3. Reconnect MGU connector X2.
4. Test the circuits in the MGU to SGCM Specification Table to ground as indicated below.

⇒	If all circuits test normal, replace the MGU.

5. Reconnect the MGU X2 connector and disconnect the SGCM X2 connector. Refer to Generator with Starter Replacement and Generator Control Module Replacement.
6. Test the circuits in the SGCM to MGU Specification Table as indicated below.

⇒	If any of the circuits are not within the specified range, replace the SGCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.