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If the oxygen sensor is detected, the oxygen sensor has power supply, but not see the
waveform change, then the cause of the failure may be as follows:
● poor connection
● oxygen-sensor fault
● engine vacuum leak
● poor fuel mixture ratio control
4) Throttle Position 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 "Throttle Position 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.
④
Since the oscilloscope "throttle position sensor" function has already default
settings (profiles probe 1X, time base range 500ms),
corresponding signal, to intuitive display waveforms, as
shown in Figure 8. (Note: As in the "SCAN" scan mode
requires patience waveform scanned)
⑤Press "CH1", you can view the value and configuration
(by default)
⑥waveform 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).
Note:
Open the ignition switch, do not start the engine, to detect
the throttle position sensor signal, slowly open to close the
throttle, observe the waveform has no sudden or irregular
changes in the situation. When the throttle position sensor is analyzed, it is possible to find
out the abnormal signal waveform in any signal waveform, for example, the instantaneous
voltage drop may indicate the error of the sensor itself, damage, or dirty. And this
abnormal signal waveform, but also easy to cause the error of the oscilloscope, so that the
vehicle fault. Most of the solar term door position sensor, when idling, the voltage value
should be all below 1.25V, and the throttle valve is fully open, the voltage value should be
more than 3.4V, and the voltage should be smooth without any change, or surge voltage
drop situation.
When the ignition switch is turned on, the engine does not start, detecting the throttle
position sensor signal, if not see the waveform with the throttle opening variation, the
failure may be as follows:
● poor connection
● bad sensor itself
5) Air flow meter sensor
just probe to the
The throttle
fully open
Throttle
Close
Pic-8 Throttle Position Sensor
Throttle
Close
16
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