EGR Temperature Sensor: Description and Operation

PURPOSE
The EGR temperature sensor is used for on-board monitoring of EGR function.

OPERATION
EGR operation is controlled by the engine control module (ECM). By measuring the intake manifold side of the EGR passage, the ECM is able to determine whether the EGR is actually opening when the EGR VSV is energized. If proper EGR operation is not detected, the ECM illuminates the malfunction indicator light (MIL) and sets a trouble code.