• | 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 starter/generator control module (SGCM) monitors the motor generator unit (MGU) temperature sensor for an overtemperature condition.
The engine is running.
MGU temperature is greater than 205°C (401°F) for 1 second.
Stop PWM (MGU shutdown)
MGU temperature is less than 150°C (212°F) for 3 seconds.
Possible MGU fan failure caused by obstructions, blockage to the vents or damaged fan.
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.
⇒ | If the 3 phase cables are within torque specifications, replace the MGU. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Generator with Starter Replacement for MGU replacement