Circuit/System Testing
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.
CAUTION:
Refer to Road Test Caution
.
- Use scan tool ECM output control Starter Enable command to enable an autostart.
- If engine starts, road test the vehicle to confirm that the autostart is operating. Refer to Diagnostic Aids.
- Gain access to the following wiring connections:
- Starter/generator control module (SGCM) 36 volt and 3 phase connections. Refer to Generator Control Module Replacement .
- Motor generator unit (MGU) 3 phase cable connections. Refer to Generator with Starter Replacement .
- Verify the above listed connections are within specifications. Refer to Fastener Tightening Specifications .
- If all connections are within specifications, replace the MGU.