LS 400 V8-4.0L (1UZ-FE) (1990)
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EGR Temperature Sensor: Description and Operation
EGR Temperature Sensor Schematic
PURPOSE
The EGR temperature sensor is used for on-board monitoring of EGR function.
LOCATION
The sensor is threaded into the EGR valve.
OPERATION
EGR operation is controlled by the ECU. By measuring the intake manifold side of the EGR passage, the ECU is able to determine whether the
EGR is actually opening when the EGR VSV is energized. If proper EGR operation is not detected, the ECU illuminates the "Check" engine light
and sets a trouble code.
