• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
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 starter/generator control module (SGCM) monitors the voltage sensor for the following:
• | To detect the failure of the APM 12-volt voltage sensor circuit below valid range. |
• | To detect the failure of the APM 12-volt voltage sensor circuit above valid range. |
The engine is running.
Sensor output voltage less than 0.5 volt for 0.5 ms and the 12-volt power supply - 12-volt output voltage is greater than 5 volts for 0.5 ms.
Sensor output voltage greater than 4.2 volts (30.2 volts) for 0.5 ms and the 12-volt power supply - 12-volt output voltage is greater than 5 volts for 0.5 ms.
• | Stop PWM (MGU shutdown). |
• | APM PWM off. |
Clears 30 seconds after cycle wake up signal.
Possible sensor short to ground or open.
Possible short to voltage or open.
Hybrid Controls Connector End Views
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.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SGCM replacement, setup, and programming.