EGR Temperature Sensor

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.

Fig 1: Identifying EGR Temperature Sensor

Courtesy of NISSAN MOTOR CO., U.S.A.

TERMINALS VOLTAGE REFERENCE

EGR temperature [°C (°F)]

Voltage⁽¹⁾ (V)

Resistance (MΩ)

0 (32)

4.59

0.73 - 0.88

50 (122)

2.32

0.074 - 0.082

100 (212)

0.62

0.011 - 0.014

⁽¹⁾	This data is reference value and is measured between ECM terminal 54 (EGR temperature sensor) and ground.

CAUTION: Never use ECM ground terminals when measuring input/output voltage. Doing so may damage the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

When EGR system is operating.

Voltage: 0 - 1.5 V

Fig 2: Temperature And Resistance Graph

Courtesy of NISSAN MOTOR CO., U.S.A.