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.
Circuit Description
The PCM output "L" terminal to alternator determines when generator will be turned off. It is on under all normal vehicle operating conditions except during low RPM conditions. Generator is turned off during low RPM conditions to remove excess load from engine. The generator warning light will illuminate anytime ignition is on and engine is not running. The warning light will turn off after engine is running and generator is putting out the desired amperage. DTC will set when engine is running, generator warning light is on, and generator "L" terminal voltage is low while PCM is commanding the generator on and condition is present for more than 30 seconds.
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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.