The auxiliary power module (APM) 12-volt output voltage is used for a 12-volt line APM output voltage control and a 12-volt line voltage sensor rationality check.

The engine is running.

12-volt output voltage is greater than 18 volts for 2 seconds.

APM PWM off.

In both the hardware and software faults, normal range for 160 ms.

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

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. Inspect for any open fuses.
2. Inspect all the 12-volt battery connections for proper torque as follows:

•	At Battery

•

At SGCM

•	At Fuse block

•	Refer to Fastener Tightening Specifications.

3. With a scan tool, clear the DTC.
4. Ignition OFF, wait 30 seconds.
5. Ignition ON, operate the vehicle within the Conditions for Running the DTC and verify the DTC does not reset.

⇒	If the DTC resets, replace the SGCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for SGCM replacement, setup, and programming