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Mass Air Flow Sensor - Denso 4D56 Service Manual

Common rail system (hp3) for mitsubishi triton.
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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.
Turbo Pressure Sensor
Input Signal
Processing Circuit
Pressure Sensor Device

8.5 Mass Air Flow Sensor

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.
This mass air flow meter has a built-in intake air temperature sensor.
Engine ECU
Vc
Constant Voltage
Power Supply
P
B
GND
Microcomputer
<Pressure Characteristics>
P
(V)
B
4.5
3.2
0.5
66.6
500
Absolute Pressure
Turbo Pressure Sensor
Intake Manifold
VC = 5 V
kPa (abs)
266.6
202.7
mmHg (abs)
1520
2000
Atmosphere
VSV
ECU
Q001231E

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4m41

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