Circuit/System Testing

Ignition ON, verify that no generator or battery current sensor DTCs are set that would cause a charging system concern.
- If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
Ignition OFF, measure the voltage across the battery terminals. The voltage should read 12.0 volts or greater at room temperature.
- If not within specified value, refer to Battery Inspection/Test .
Connect a carbon pile tester to the battery.
Start the engine and increase the engine speed to 2,500 RPM. Observe the voltage reading on the tester. The voltage should read between 12.6-15.0 volts.
- If not within specified range, replace the generator.
Adjust the carbon pile tester to the specified load test output value, refer to Generator Usage .
- If not within specified value, replace the generator.