Isuzu 4HL1 Workshop Manual page 79

Tech 2 Data
Item
Display
7/63 ECT Sensor
(Engine Coolant
Temperature)
8/63 Coolant
Temperature
9/63 IAT Sensor
(Intake Air
Temperature)
10/63 Intake Air
Temperature
11/63 Fuel
Temperature
Sensor
12/63 Fuel
Temperature
13/63 Barometric
Pressure Sensor
14/63 Barometric
Pressure
15/63 Desired Rail
Pressure
Units
displayed
V This parameter refers to the
signal voltage input to the ECM
from the ECT (engine coolant
temperature) sensor. (Higher
engine coolant temperature
provides lower voltage.)
°C This parameter refers to the
value calculated by the ECM
using the signals from the ECT
sensor.
V This parameter refers to the
signal voltage input to the ECM
from the IAT (intake air
temperature) sensor. (Higher
intake air temperature provides
lower voltage.)
°C This parameter refers to the
value calculated by the ECM
using the signals from the IAT
sensor.
V This parameter refers to the
signal voltage input to the ECM
from the FT (fuel temperature)
sensor. (Higher fuel temperature
provides lower voltage.)
°C This parameter refers to the
value calculated by the ECM
using the signals from the FT
sensor.
V This parameter refers to the
signal voltage input to the VIM
from the barometric pressure
sensor. (Higher barometric
pressure provides higher
voltage.)
kPa This parameter refers to the
value calculated by the VIM using
the signals from the barometric
pressure sensor.
MPa This parameter refers to the
value calculated by the ECM
using engine speed, fuel
temperature, engine coolant
temperature, and desired fuel
injection quantity.
Engine Control System 1A-77
Description How to use parameters
The engine coolant temperature
is a proper criterion for various
control configurations (e.g.,
startup, cold, or post-warmup
condition). This parameter may
be used as one of DTC detection
conditions.
When the display deviates from
the specified level, the sensor,
circuit, or ECM may be faulty.
The intake air temperature is a
proper criterion for various
control configurations (e.g.,
startup, cold, or post-warmup
condition). This parameter may
be used as one of DTC detection
conditions.
When the signal (temperature
display) from the sensor deviates
from the specified level, the
sensor, circuit, or ECM may be
faulty.
The fuel temperature is a proper
criterion for various control
configurations (e.g., startup, cold,
or post-warmup condition). This
parameter may be used as one of
DTC detection conditions.
When the signal (temperature
display) from the sensor deviates
from the specified level, the
sensor, circuit, or ECM may be
faulty.
The barometric pressure sensor
is a proper criterion for various
control configurations (e.g.,
startup, cold, or post-warmup
condition). This parameter may
be used as one of DTC detection
conditions.
When the display deviates from
the specified level, the sensor,
circuit, or ECM may be faulty.
When the display is improper,
fuel system components (such as
common rail, pump, and fuel
pipe), common rail pressure
sensor, circuit, or ECM may be
faulty.