The starter/generator control module (SGCM) monitors the performance of the motor generator unit (MGU) temperature sensor to detect if it is within range of the other temperature sensors, by comparing it to other temperature sensors it monitors.

The engine is ON.

Power inverter module (PIM) TEMP 1, PIM TEMP 2, auxiliary power module (APM) TEMP, Board TEMP, motor/generator unit (MGU) TEMP greater than 30°C (80°F) and engine OFF timer greater than 480 minutes of start up.

Hybrid system torque will be limited to 50 percent.

The MGU temperature sensor returns normal range for 10 seconds

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Hybrid Controls Connector End Views

Description and Operation

Starter/Generator Description and Operation

Electrical Information Reference

Scan Tool Reference

Scan Tool Data List

Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.

1. Verify DTCs P0A38 or P0A39 are not set.

⇒	If P0A38 or P0A39 are set diagnose those first.

2. Ignition OFF, disconnect harness connectors from the SGCM. Refer to Generator Control Module Replacement
3. Test for 120 - 125 kohms between C2 terminals 2 and 14.

⇒	If within the specified range, replace the SGCM.

4. Disconnect the 7 pin C1 connector at the MGU. Refer to Generator with Starter Replacement .
5. Test for less than 1 ohm between SGCM connector harness terminal 2 and the MGU C1 connector harness terminal G.

⇒	If greater than the specified value, repair the open/high resistance.

6. Test for less than 1 ohm between SGCM connector harness terminal 14 and the MGU C1 connector harness terminal F.

⇒	If greater than the specified value, repair the open/high resistance.

7. If the circuits test normal, replace the MGU.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.