EGR Temperature Sensor: Description and Operation

Reference Data:

Component Description
The EGR temperature sensor detects temperature changes in the EGR passageway. When the EGR volume control valve opens, hot exhaust gases flow, and the temperature in the passageway changes. The EGR temperature sensor is a thermistor that modifies a voltage signal sent from the ECM. This modified signal then returns to the ECM as an input signal. As the temperature increases, EGR temperature sensor resistance decreases.

This sensor is not directly used to control the engine system. It is used only for the on board diagnosis.

CAUTION: Do not use ECM ground terminals when measuring input/output voltage.

Doing so may lead the ECM's transistor damage. Use ground other than ECM, such as body ground.

When EGR system is operating.
Voltage: 0 - 1.5 V