Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Test
- GENERATOR FULL FIELD TEST NOTE: Diagnose and repair any generator sense or field control circuit DTCs before proceeding with this test.
Start the engine and allow it to reach operating temperature.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.With the scan tool, perform the Generator Full Field test. Follow the instructions displayed on the scan tool.
Monitor the system (battery) voltage and the generator sense voltage on the scan tool while performing the test.
NOTE: With the engine running, the difference between the system (battery) voltage and the generator sense voltage should be below.2 volts.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.