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key is turned on and tap the sensor when the engine does not start, this time waveform if
a difference, said air flow meter sensor itself is bad, or there is a short circuit or line
breaking situation.
Air flow meter sensor generates a signal to a frequency signal, the frequency of the
number of so-called square-wave signal appears every second, the normal air flow meter
sensor fixed to the engine speed signal values to produce little change in frequency, if the
fluctuation range is too large, it means that poor air flow meter sensor. If the detected air
flow meter, air flow meter power supply, but the changes seen in the waveform, the failure
may be as follows:
●The oscilloscope has not received the signal transmitted from the air flow meter
●sensor itself is unstable
6) Intake manifold absolute pressure sensor
①
The same as the crankshaft, camshaft position sensor Step 1.
②
Select "Sensor" after entering the main menu, then enter the sub-menu press the arrow
keys to select "intake manifold absolute pressure
sensor" ,press "OK" button to confirm to enter the
oscilloscope user interface .
③
Connect the CH1 probe to the oscilloscope and
set probe to 1X file transfer, then connect the
grounding clip to the signal ground or grounding.
④Since the oscilloscope "intake manifold absolute
pressure sensor" function has already default
settings (profiles probe 1X, time base range 500ms),
just probe to the corresponding signal, to intuitive
display waveforms, as shown in Figure 9. (Note: As
in the "SCAN" scan mode requires patience
waveform scanned)
⑤
Press "CH1", you can view the value and configuration (by default)
⑥
waveform can be self-fulfilling their needs by adjusting the time base, vertical volts /
division and trigger mode (time base, vertical volts / division and other specific operations,
please refer to the Universal oscilloscope operation).
7) Knock sensor
①The same as the crankshaft, camshaft position
sensor Step 1.
②Select "Sensor" after entering the main menu, then
enter the sub-menu press the arrow keys to select
"knock sensor", press "OK" button to confirm to enter
the oscilloscope user interface.
③Connect the CH1 probe to the oscilloscope and set
probe to 1X file transfer, then connect the grounding
clip to the signal ground or grounding.
④Since the oscilloscope "knock sensor" function has
Idling
Pic-9 Intake manifold absolute pressure sensor
Pic-10 Knock Sensor
18
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