Sensor; Connection - Launch X-431 User Manual

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3. Sensor

The sensor simulation function can accurately judge the quality of the sensor

and reduce blind replacement of accessories. For example, the DTC shows that

the water temperature sensor is faulty, but whether it is the fault of the water

temperature sensor itself, or the wiring between the sensor and ECU, or the fault

of the ECU itself still needs further diagnosis. At this time, the signal of the water

temperature sensor can be simulated by the simulation function instead of the

water temperature sensor and inputted to the microcomputer. If the engine

working condition is improved and the fault symptom disappears, it can be

judged as a fault of the water temperature sensor. If the fault symptom persists,

directly input the signal at the corresponding terminal of the ECU. If the fault

symptom disappears, it is the wiring fault between the water temperature sensor

and ECU. If the fault symptom persists, it can be judged as a fault of the ECU

itself.

The following connections are required for detecting sensors:

1) Connect the sensor module to the diagnostic tool via the USB cable (refer to

Chapter 2.1).

2) Remove the sensor connected to the ECU.

3) According to the specific application and bus terminal types, make the

following connections (note: when performing the sensor functions, the

hardware output ports of the sensor module are CH1 and CH2).

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X-431 Module S2 User Manual

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