Skip to main content

VMI3 Basic Usage: Dual Display and Simulation Application (CKPS Measurement)

Oscar Eom
Updated

This guide explains step-by-step how to use the dual display feature of the GDS Smart VMI3 to analyse data from the crankshaft position sensor (CKPS), measure frequency with a multimeter, and perform simulation by outputting a virtual pulse signal (Simulation).

Guide Video

Step 1: Preparation and Probe Connection

You must connect the probe accurately to the signal wire of the sensor you wish to measure.

  • Test vehicle: KONA (SX2) G1.6 T-GDI
  • Channel B (CH.B) – CKPS (Crankshaft Position Sensor) Measurement
    • (+) Probe: Connect to CKPS pin 3 (sensor signal line)
    • (-) Probe: Connect to battery (-) terminal (vehicle body ground)

Step 2: Dual Display – Data Analysis and Multimeter

This process compares the sensor data value recognised by the ECU with the physical signal value (frequency) measured directly by the VMI3 device. Measurement is taken with the engine in [Engine Idle] state.

  • From the dual display menu on screen, select [데이터 분석(Data Analysis)] and [Multimeter].
  • In the Data Analysis window, select the 'Actual Engine Speed' item.
  • In the Multimeter window, set the measurement mode to 'Frequency (Hz)' to compare whether the correct frequency is output according to engine speed.

Step 3: Dual Display – Data Analysis and Simulation Output

This process checks whether the wiring and ECU are recognised correctly by outputting a virtual pulse signal from the VMI3 instead of the sensor signal. This step is performed with the engine stopped and the ignition in [IG ON (Ignition ON)] state.

  • Change the multimeter screen of the dual display to the [시뮬레이션(Simulation)] function window.
  • Set the simulation signal output mode to Pulse Output.
  • When you send a signal from the VMI3 by adjusting the frequency (Hz) (e.g., 365Hz), check in the data analysis window above whether the 'Actual Engine Speed' value changes to a normal RPM.

💡 Troubleshooting Tips

The simulation function is very helpful in determining whether the fault is with the sensor component itself or with the vehicle wiring and ECU system. If you inject a normal pulse signal into the wiring from the VMI3 but the diagnostic tool's RPM data does not increase, you may suspect a wiring break or internal ECU circuit fault rather than a sensor fault. Conversely, if the data appears normally, it is more likely to be a sensor issue.

Related articles

Comments

0 comments

Article is closed for comments.