KS Motorcycles K-LIGHT125, Maintenance Manual

Page: 263 / 278

18.2.6 Inlet Pressure Sensor
18.2.6.1 Working Principles of Inlet Pressure Sensor
This sensor is used to measure the absolute pressure of air intake elbow, reflect the size of intake pressure
according to the difference of resistance, and then calculate the intake volume in engine combustion chamber
through indirect conversion, and it is also a non-serviceable part.
18.2.6.1 Appearance of Inlet Pressure Sensor
18.2.6.3 Electrical environment

Typical voltage: The working DC reference voltage of sensor circuit is 5 ± 0.1 V.
18.2.6.4 Fault Determination
1. Check whether the plug-in is loose
2. Check the fault or current data with a diagnostic instrument
3. View the breakover between the sensor and ECU and check whether the abnormal operation of sensor is caused
by cables
4. Inspection of sensor: Connect with cable and power on; measure the voltage between pin 2 and pin 3 with a
multimeter; in the standard case, the voltage is 4.25-4.75V under the air pressure of 100kPa when the sensor is not
started. Otherwise, the sensor fails.
The measurement diagram is as follows:
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