VERACRUZ(EN) >2007 > G 3.8 DOHC > Fuel System > Engine Control System > Mass Air Flow Sensor (MAFS)>Repair procedures  
INSPECTION
FUNCTION AND OPERATION PRINCIPLE
Mass Air Flow Sensor (MAFS) is a hot-film type sensor and is located in between the air cleaner and the throttle body. It consists of a tube, a sensor assembly and honey cell and detects intake air quantity flowing into the intake manifold. While the intake air coming out of the air cleaner flows by the honey cell, it becomes laminar flow, and then it passes the hot-film. At this time, heat transfer is generated by convection and this sensor loses its energy. This sensor detects the mass air flow by using the energy loss and transfers the information to the PCM by frequency. The PCM calculates fuel quantity and ignition timing.

SPECIFICATION
Air Flow (kg/h)
 Output Frequency (Hz)
12.6
 2,617
18.0
 2,958
23.4
 3,241
32.4
 3,653
43.2
 4,024
57.6
 4,399
72.0
 4,704
108.0
 5,329
144.0
 5,897
198.0
 6,553
270.0
 7,240
360.0
 7,957
486.0
 8,738
666.0
 9,644
900.0
 10,590

SCHEMATIC DIAGRAM

COMPONENT INSPECTION
1.
Check the MAFS visually.
A.
Mounting direction correct.
B.
Any contamination, corrosion or damage on connector.
C.
Air cleaner's clogging or wet.
D.
MAFS cylinder's deforming or blocking by any foreign material.
2.
Check any leakage on intake system and intercooler system.