This guide explains how to use the 'Duty Output' mode in the VMI3 simulation function to forcibly operate the vehicle's Purge Control Solenoid Valve (PCSV) and check for individual actuator defects.
Guide Video
Step 1: Preparation and Connecting the PCSV Connector
With the engine 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 chassis ground).
Step 2: VMI3 Duty Output Mode Settings
VMI3 generates a virtual PWM control signal in place of the engine control unit (ECU).
- In the menu, select
[Simulation], then specify the signal type as[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 Status (Mechanical Inspection)
Press the [▲/▼] buttons on the device screen to change the duty ratio (%) and check the actual response of the part.
- Check for operating noise and vibration: Each time the duty ratio changes, you should hear a "clicking/ticking" mechanical operating sound from the solenoid valve in the engine room or feel vibration by hand, indicating normal operation.
- Setting the diagnostic direction:
- If the part operates well when a signal is sent with VMI3: The actuator itself is normal. You should check for power supply issues at the front stage or ECU logic problems.
- If there is no response at all even when a signal is sent with VMI3: Focus on checking for coil disconnection/sticking inside the valve or wiring contact failure (disconnection) up to the probe connection point.
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