1.3 MULTIJET 16V
(75 & 90 HP)
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
Air flow rate signal trend
In the digital air flow meter, the signal sent to the engine management control unit features an
amplitude of 5 V and is frequency-variable (1.4 kHz and 12 kHz).
An increase in inlet air flow rate is matched by an increase in the frequency of the output
signal from the meter (and, as a result, a decrease in the period value).
Air flow rate
Frequency output
Digital air flow meter: AIR FLOW RATE signal
To measure and check the signal amplitude (voltage: 5 V), a graphic voltmeter is needed. To
measure the frequency value, you will just need to use a multimeter with selection of the
frequency measurement and the respective prods connected as follows: one to the air flow
meter ground pin; one to the air flow rate signal pin.
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