The starter/generator control module (SGCM) monitors to detect the failure of the auxiliary power module (APM) temperature sensor circuit by taking the average of the 2 power inverter module (PIM) sensors and subtracting the module temperature and looking for a difference.

The engine is running.

APM temperature sensor is greater than 55°C (131°F) for 2 seconds.

APM 50 percent maximum current output

Voltage limit returns to normal range for 10 seconds.

Possible internal failure at temperature sensor

Schematic Reference

Hybrid Controls Schematics

Connector End View Reference

Hybrid Controls Connector End Views

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. If DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
2. If DTC is current, replace the starter/generator control module (SGCM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SGCM replacement, setup, and programming