Circuit/System Testing
WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- If the DTC is history refer to Charging System Test .
- Ignition On and the engine running, test for 9.5-17.5 volts between the battery positive voltage and the ground circuits of the affected module.
- If not within the specified range test the B+ circuits for a short to ground or an open/high resistance, and the ground circuits for a open/high resistance.
- If all the circuits test normal, test or replace the affected module.