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.
Function And Features
* In a normal vehicle, the battery voltage fluctuates from 11.5V to 14.5V. However, during cranking, the voltage drops to 9.8V, and a power supply voltage change of about 5V occurs in the power supply voltage (12V) supplied to various actuators. In particular, actuators that require precise control, such as injectors, rail Pressure control valves, and EGR actuators, may change control characteristics according to changes in battery voltage. In order to correct the change in actuator characteristic value due to the change in voltage, the PCM detects the change in battery voltage and corrects the actuator operation amount according to the change in voltage.
The PCM detects the battery voltage by monitoring the voltage of the PCM connector (PCM 5, terminal 6, PCM 3, terminal 5) supplied through the main relay.
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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.