Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

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 DTC is history, refer to Testing for Intermittent Conditions and Poor Connections .
Ignition OFF, disable the hybrid system. Refer to Hybrid Battery Service Disconnect/Connect .

NOTE: Refer to Fastener Tightening Specifications .

IMPORTANT: It is important that the 3-phase cable connections are clean and the fasteners are torqued to specifications.

Inspect for poor connections and any evidence of arching at the 3-phase cable connectors of the SGCM and the MGU.
Disconnect the 3-phase cables from the SGCM. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
Test each of the 3-phase cables for an open as follows:
- Cable U to V
- Cable U to W
- Cable V to W
Test each of the 3-phase cables for a short to ground.
- If all circuits test normal, replace the SGCM.
Disconnect the 3-phase cables from the MGU. Refer to Generator Control Module 3-Phase Cable Assembly Replacement .
Test each of the 3-phase cables individually for an open.
- If all circuits test normal, replace the MGU.

If any circuit does not test normal, replace the 3-phase cable assembly.