Du kannst dazu beitragen: 
24.03.2017, 16:13
Es sind Digitale Signale:
The MAF sensor must be connected to its connector to perform this test.
With the key in the OFF position.
With a suitable tool connected to the RED multimeter lead, probe the A circuit as shown in the photo.
Put the multimeter in frequency (Hz) mode (don't have a digital multimeter that can read Hertz frequency? Click here to see my recommendations: Buying A Digital Multimeter For Automotive Diagnostic Testing).
Connect the BLACK lead to the battery (-) negative terminal.
Start the already warmed up engine.
Note the Hertz reading on your multimeter at idle. This reading may be stable (with only small fluctuations) or unstable with very extreme fluctuations. No matter what the instability in the reading, this will be your base reading.
Manually accelerate the engine from the engine compartment as you watch the multimeter's frequency readings. The Hertz Frequency readings should increase.
When you let go off of the throttle and the engine returns to idle, the Hertz reading should come down to the base Hertz reading you observed in step 6 of this test.
Repeat this as often as you need to verify that the Hertz numbers on your multimeter rise and decrease smoothly every single time.
If the MAF sensor is good, these readings will not spike up and down crazily but will smoothly increase as you manually accelerate the engine and smoothly decrease as you let the engine return to idle.
The MAF sensor must be connected to its connector to perform this test.
With the key in the OFF position.
With a suitable tool connected to the RED multimeter lead, probe the A circuit as shown in the photo.
Put the multimeter in frequency (Hz) mode (don't have a digital multimeter that can read Hertz frequency? Click here to see my recommendations: Buying A Digital Multimeter For Automotive Diagnostic Testing).
Connect the BLACK lead to the battery (-) negative terminal.
Start the already warmed up engine.
Note the Hertz reading on your multimeter at idle. This reading may be stable (with only small fluctuations) or unstable with very extreme fluctuations. No matter what the instability in the reading, this will be your base reading.
Manually accelerate the engine from the engine compartment as you watch the multimeter's frequency readings. The Hertz Frequency readings should increase.
When you let go off of the throttle and the engine returns to idle, the Hertz reading should come down to the base Hertz reading you observed in step 6 of this test.
Repeat this as often as you need to verify that the Hertz numbers on your multimeter rise and decrease smoothly every single time.
If the MAF sensor is good, these readings will not spike up and down crazily but will smoothly increase as you manually accelerate the engine and smoothly decrease as you let the engine return to idle.