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.