This guide provides step-by-step instructions on how to use the Dual Display function of the GDS Smart VMI3 for analyzing crankshaft position sensor (CKPS) data, measuring frequency with a multimeter, and performing simulation by outputting virtual pulse signals.
Guide Video
Step 1: Preparation and Probe Connection
You must correctly connect the probe to the signal line of the sensor you want 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 displays and compares the sensor data value recognized by the ECU and the physical signal value (frequency) measured directly by the VMI3 device at the same time. Measurements are taken under [Engine Idle] condition.
- From the dual display menu on the 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 the wiring and ECU recognition by outputting a virtual pulse signal from the VMI3 instead of the sensor signal. This step is performed with the engine off in the [IG ON (Ignition ON)] state.
- Change the multimeter screen of the dual display to the
[시뮬레이션(Simulation)]function window. - Set the simulation signal output type to Pulse Output.
- Adjust the frequency (Hz) on the VMI3 and transmit the signal (e.g., 365Hz). Then, check whether the 'Actual Engine Speed' value in the upper data analysis window changes to a normal RPM.
💡 Troubleshooting Tips
The simulation function is very helpful in determining whether the problem is with the sensor component itself or with the vehicle wiring and ECU system. If you inject a normal pulse signal from the VMI3 into the wiring but the diagnostic tool’s RPM data does not increase, you can suspect a wiring disconnection or internal ECU circuit fault rather than a sensor issue. Conversely, if the data is displayed normally, it is highly likely that there is a problem with the sensor itself.
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