Isuzu N 2008 Series Workshop Manual page 362

The APP sensor is mounted on the accelerator pedal
bracket. The sensor is made up of two individual
sensors within one housing. The ECM uses the APP
sensors to determine the amount of acceleration or
deceleration that is desired. The APP sensors are hall
element type sensors. Each APP sensor provides a
different signal to the ECM on the each signal circuit,
which relative to the position changes of the
accelerator pedal angle. The APP sensor 1 signal
voltage is low at rest and increases as the pedal is
depressed. The APP sensor 2 signal voltage is high at
rest and decreases as the pedal is depressed.
Barometric Pressure (BARO) Sensor
The BARO sensor is located behind of the instrument
panel (IP) bezel and fixed on the crossbeam via
bracket. The BARO sensor is a transducer that varies
voltage according to changes the barometric pressure.
The BARO sensor provides a signal to the ECM on the
signal circuit, which is relative to the pressure changes
of the barometric pressure. The ECM should detect a
low signal voltage at a low barometric pressure, such
as high altitude place. The ECM should detect high
signal voltage at a high barometric pressure. The ECM
uses this voltage signal to calibrate the fuel injection
quantity and injection timing for altitude compensation.
Boost Pressure Sensor
The boost pressure sensor is located in the air
induction tubing. The boost pressure sensor is a
transducer that varies voltage according to changes in
the air pressure inside the air tubing. The boost
pressure sensor provides a signal to the ECM on the
signal circuit, which is relative to the pressure changes
in the air tubing. The ECM should detect a low signal
voltage at a low boost pressure, such as low engine
load. The ECM should detect high signal voltage at a
high boost pressure, such as high engine load.
Camshaft Position (CMP) Sensor
469%$-50 "
Legend
Engine Control System (4JJ1)
!
#
1. Timing chain sprocket
2. Camshaft position (CMP) sensor
3. Rotating direction
1A-359
LNW76ESH002101
469#$-50 "