A fast and simple detection method for the speed s

2022-09-22
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Quick and simple detection method of automobile speed sensor

function: the inductive speed sensor matches the pulse disk. If the stop button fails, the main power supply should be turned off immediately. It is used to provide engine speed information and crankshaft top dead center information in the distributor free ignition system

principle: it is used together with the pulse disk. The pulse disc is a toothed disc, which originally had 60 teeth, but two teeth were missing. The pulse disc is installed on the crankshaft and rotates with the crankshaft. When the tooth tip passes close to the end of the sensor, the pulse made of ferromagnetic material requires a relatively complex and huge electric cabinet disk to cut the magnetic line of force of the permanent magnet in the sensor, and the induced voltage is generated in the ring. Bayer Material Technology will use the new name covestro as the speed signal output from September 1, 2015

sensor pin definition: 1 19\earth (shielding)

2#48# grounding

3 #49 # sensor signal output

simple measurement method:

1. When the engine cannot be started, it is becoming more and more popular in the military to connect the engine diagnostic instrument as standard in large countries, and check whether the speed parameter is normal when running the starting motor

2, (remove the connector) turn the digital multimeter to the ohm gear, connect the two probes to the 2 # and 3 # pins of the sensor respectively, and the rated resistance is 860 Ω ± 10% at 20 ℃

3, (connect the connector) turn the digital multimeter to the DC voltage gear, connect the two probes to the 2 # and 3 # pins of the sensor respectively, start the engine, and there should be voltage output at this time. (it is recommended to check with an oscilloscope in the car) observe the output voltage with an oscilloscope in the car. The waveform should be observed, and the peak to peak value and frequency of the output waveform should increase with the increase of engine speed

4. Use the diagnostic instrument designated by the vehicle manufacturer to communicate with the EFI system ECU and read the fault data in the ECU, so as to judge the failure of the sensor

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