Operation Section
1
–
24
(1) Atmospheric Pressure Measurement Conditions
• The VSV turns ON for 150msec to detect the atmospheric pressure when one of the conditions below is present:
• Engine speed = 0rpm
•Starter is ON
• Idle is stable
(2) Turbo Pressure Measurement Conditions
• The VSV turns OFF to detect the turbo pressure if the atmospheric pressure measurement conditions are absent.
8.5 Mass Air Flow Sensor
z This air flow meter, which is a plug-in type, allows a portion of the intake air to flow through the detection area. By directly measuring
the mass and the flow rate of the intake air, the detection precision has been improved and the intake air resistance has been reduced.
z This mass air flow meter has a built-in intake air temperature sensor.
Q001231E
VSV
Atmosphere
Turbo Pressure Sensor
Intake Manifold
0.5
4.5
3.2
VC = 5 V
266.6
Absolute Pressure
66.6
202.7
500
2000
1520
P
B (V)
kPa (abs)
mmHg (abs)
<Pressure Characteristics>
ECU
Turbo Pressure Sensor
Pressure Sensor Device
Engine ECU
Constant Voltage
Power Supply
Microcomputer
Input Signal
Processing Circuit
Vc
P
B
GND
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