FUEL SYSTEM
On-vehicle Inspection of MPI Components
EGR TEMPERATURE SENSOR <California>
EGR
senso
EGR temperature sensor
Harness
control
unit
connector
Temperature
OPERATION
l
The EGR temperature sensor converts the temperature of EGR gas downstream from the EGR valve to
voltage and inputs it to the engine control unit. The engine control unit judges the condition of the EGR by
this signal. If there is abnormal condition, the engine warning light is turned on to notify the driver.
l
Five volt power supply in the engine control unit is applied to the EGR temperature sensor through the
resistance in the unit. This power supply further passes through the EGR temperature sensor, which is a
kind of a resistor, and is grounded at the engine control unit. The resistance of the EGR temperature
sensor is characterized by a decrease in resistance with an increase of EGR temperature due to increase
in quantity of EGR.
l
EGR temperature sensor terminal voltage increases or decreases with EGR temperature sensor
resistance. Therefore, EGR temperature sensor terminal voltage changes with EGR gas temperature. The
higher the EGR gas temperature, the lower the EGR temperature sensor terminal voltage.
TSB Revision
1
Содержание 3000GT 1991
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