VMI3 Basic Usage Guide: Purge Control Solenoid Valve (PCSV) Simulation Guide

Step 1: Preparation and Connecting the PCSV Connector

With the engine switched off and the ignition in the [IG ON] state, connect the probe to the actuator (PCSV) connector wiring.

• Test Vehicle: Seltos (SP2) G2.0 MPI
• Channel A (CH.A) - VMI3 Simulation Output Connection:
  • (+) Probe: Connect to Pin 2 (Control Line) of the PCSV (Purge Control Solenoid Valve) connector.
  • (-) Probe: Connect to the battery (-) terminal (vehicle body ground).

Step 2: Setting the VMI3 Duty Output Mode

The VMI3 generates a virtual PWM control signal in place of the Engine Control Unit (ECU).

• In the menu, select [Simulation] and then set the signal type to [Duty Output].
• For testing, set the frequency to the 10Hz or 20Hz range.
• Click the [Start] icon at the bottom to begin sending the duty signal.

Step 3: Checking Actuator Operation (Mechanical Inspection)

Press the [▲/▼] buttons on the device screen to change the duty ratio (%) and check the actual response of the part.

• Check Operation Sound and Vibration: Each time the duty ratio changes, you should hear a "clicking" mechanical operating sound or feel vibration by hand from the solenoid valve in the engine bay. This indicates normal operation.
• Setting Diagnostic Direction:
  • If the part operates well when a signal is sent from the VMI3: The actuator itself is normal. You should check for issues with power supply at the front end or problems with the ECU logic.
  • If there is no response at all even when a signal is sent from the VMI3: Focus inspection on an open circuit/sticking in the valve's internal coil or poor wiring contact (open circuit) up to the probe connection point.