Engine Control System 1A-77
7/63
ECT Sensor
(Engine Coolant
Temperature)
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.)
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.
8/63
Coolant
Temperature
°C
This parameter refers to the
value calculated by the ECM
using the signals from the ECT
sensor.
When the display deviates from
the specified level, the sensor,
circuit, or ECM may be faulty.
9/63
IAT Sensor
(Intake Air
Temperature)
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.)
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.
10/63
Intake Air
Temperature
°C
This parameter refers to the
value calculated by the ECM
using the signals from the IAT
sensor.
When the signal (temperature
display) from the sensor deviates
from the specified level, the
sensor, circuit, or ECM may be
faulty.
11/63
Fuel
Temperature
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.)
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.
12/63
Fuel
Temperature
°C
This parameter refers to the
value calculated by the ECM
using the signals from the FT
sensor.
When the signal (temperature
display) from the sensor deviates
from the specified level, the
sensor, circuit, or ECM may be
faulty.
13/63
Barometric
Pressure Sensor
V
This parameter refers to the
signal voltage input to the VIM
from the barometric pressure
sensor. (Higher barometric
pressure provides higher
voltage.)
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.
14/63
Barometric
Pressure
kPa
This parameter refers to the
value calculated by the VIM using
the signals from the barometric
pressure sensor.
When the display deviates from
the specified level, the sensor,
circuit, or ECM may be faulty.
15/63
Desired Rail
Pressure
MPa
This parameter refers to the
value calculated by the ECM
using engine speed, fuel
temperature, engine coolant
temperature, and desired fuel
injection quantity.
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.
Item
Tech 2 Data
Display
Units
displayed
Description
How to use parameters
Summary of Contents for 4HL1
Page 267: ...No LG4HL WE 0229DOM...