Infiniti Car 1998-05

Exhaust Gas Recirculation (EGR) System

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EGR Temperature Sensor



Operation

The EGR temperature sensor detects temperature changes in the EGR passageway. When the EGR 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 than returns to the ECM as an input signal. As the temperature increases, the EGR temperature sensor resistance decreases. This sensor is not directly used to control the engine system, as it is used for the on-board diagnosis.

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Fig. The EGR temperature sensor

Testing

The resistance of the EGR temperature sensor should be:



If the temperature of the EGR is 32°F the voltage should be 4.51 and the resistance should be 0.68-1.11 megohms.
 
If the temperature of the EGR is 122°F the voltage should be 2.53 and the resistance should be 0.092-0.12 megohms.
 
If the temperature of the EGR is 212°F the voltage should be 0.87 and the resistance should be 0.017-0.024 megohms.
 

 
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