EGR Temperature Sensor

The EGR temperature sensor detects temperature changes in the EGR passageway. When the cooling efficiency of EGR cooler is extremely deteriorated, exhaust gas is not cooled than expected, 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.

Fig 1: Locating EGR Temperature Sensor

Courtesy of NISSAN NORTH AMERICA, INC.

This sensor is not directly used to control the engine system. It is used only for the fail safe.

Fig 2: Resistance And Temperature Graph

Courtesy of NISSAN NORTH AMERICA, INC.

EGR Temperature [°C (°F)]	Voltage* (V)	Resistance (MΩ)
0 (32)	4.87	0.62 - 1.05
50 (122)	4.54	0.065 - 0.094
100 (212)	2.88	0.011 - 0.015

*: These data are reference values and are measured between ECM terminals.

NOTE:

When EGR system is operating.

Voltage

Approx. 1 - 4 V

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.