ENGINE CONTROL SYSTEM 3-9
IAT (Intake Air Temperature) SENSOR
The IAT sensor is installed on the surge tank and used to detect
the intake air temperature.
This sensor is the same type as the cylinder temperature sen-
sor, and inputs a signal to the ECM as a voltage value.
This input signal is used to compensate the fuel injection time
duration.
MAP (Manifold Absolute Pressure) SENSOR
The MAP sensor is installed on the intake manifold and used to
detect the intake manifold pressure. It also detects the baromet-
ric pressure before starting the engine. This sensor inputs the
intake manifold pressure to the ECM as a voltage value. This
input signal is used as the fundamental signal to determine the
fuel injection time duration, ignition timing, etc.
CYLINDER TEMPERATURE SENSOR
The cylinder temperature sensor is installed on the cylinder (be-
hind the electric part holder) and used to detect the cylinder tem-
perature.
This is a thermistor type sensor (resistance of which changes
depending on the temperature) and inputs a signal to the ECM
as a voltage value. This input signal is used to compensate the
fuel injection time duration, ignition timing, etc.
This sensor is also used to detect engine over-heat as the ECM
detects both the temperature and temperature change gradient
(temperature rise vs time).
EXHAUST MANIFOLD TEMPERATURE SENSOR
The exhaust manifold temperature sensor is installed on the ex-
haust manifold and used to detect the exhaust manifold tem-
perature. This sensor is the same type as the cylinder tempera-
ture sensor, and inputs a signal to the ECM as a voltage value.
This input signal is also used to detect engine over-heat.
Temperature
Resistance
