9.9.3 Function of diesel particulate filter
(DPF)
With a closed end structure, gases in the exhaust gas
flow through the wall surface while large particulate
matter (PM) can not pass through the wall surface and
accumulate.
9.10 Air flow sensor
9.10.1 Outline of air flow sensor
The air flow sensor detects intake air temperature and
intake air flow amount.
9.10.2 Structure of air flow sensor
The air flow sensor is made up of a hot wire, cold wire,
and temperature sensor.
(1) Air flow sensor
(2) Hot wire, cold wire
(3) Circuit
Wiring Diagram
(4) Air flow sensor
(5) Drive circuit
(6) Intake air temperature sen-
sor
(A) Battery voltage (+12 V)
(B) Ground
(C) Output signal (Vo)
(D) Intake air temperature sen-
sor (+)
(E) Intake air temperature sen-
sor (-)
9.10.3 Function of air flow sensor
The air flow sensor uses the hot wire and cold wire to
measure the intake air flow amount.
Also, the air flow sensor is an intake air temperature
sensor and measures the temperature of the intake air.
The wire and intake air temperature sensor have power
supplied from the engine ECU.
The wire is maintained at a specified temperature by
the power supplied.
The wire part changes temperature based on intake air
passing over the wire.
The wire has characteristics such that resistance value
changes based on temperature and flow rate is
measured based on these resistance changes.
The resistance value changes based on intake air
temperature and the intake air temperature sensor
measures the temperature based on this change in
resistance.
4. ENGINE
MECHANISM
9. Aftertreatment system
4-80
D1803-CR-E4,D1803-CR-TE4,D1803-CR-TIE4,V2403-CR-E4,V2403-CR-TE4,V2403-CR-TE4BG,V2403-CR-TIE4
KiSC issued 12, 2018 A
Summary of Contents for D1803-CR-E4
Page 17: ...1 SAFETY KiSC issued 12 2018 A ...
Page 24: ...2 GENERAL KiSC issued 12 2018 A ...
Page 67: ...3 MAINTENANCE KiSC issued 12 2018 A ...
Page 100: ...4 ENGINE KiSC issued 12 2018 A ...
