ENGINE
L3301, L3901, L4701, WSM
1-M18
Camshaft Position Sensor
The cam position sensor (1) is mounted near the
supply pump gear of the gear case and the sensor
functions in the same way as the crank position sensor.
This sensor detects the teeth of the pulsar gear (2)
and the engine ECU uses this signal to calculate the cam
angle.
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Coolant Sensor
The temperature sensor is mounted to the water
flange and uses a thermistor in the sensor part to detect
temperature.
A characteristic of thermistors is that their electrical
resistance varies with temperature, and this
characteristic is used by the different sensors to detect
temperature via voltage.
9Y1211012ENM0031US0
Atmosphere Pressure Sensor
An atmosphere pressure sensor is installed in the
body of the ECU and detects atmospheric pressure
close to the ECU.
This is provided to prevent changes to combustion
status due to changes in atmospheric pressure. (At high
altitudes, air pressure is low and air volume is low
making complete combustion difficult etc.)
• Since the atmospheric pressure sensor has not
been adopted as a part, replace the ECU
assembly when the atmospheric pressure is
needed to replace.
9Y1211012ENM0033US0
(1) Cam Position Sensor (2) Pulsar Gear
(1) Coolant Sensor
(1) Atmosphere Pressure
Sensor
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