EGR Temperature Sensor

Operation

The EGR temperature sensor functions to convert the data regarding the temperature of the EGR gas downstream from the EGR valve to voltage, and to input that voltage (as signals) to the engine control module.

The 5V power supply within the engine control module is supplied, by way of the resistance within the unit, to the EGR temperature sensor; it passes through the EGR temperature sensor, which is a type of resistor, and is grounded at the engine control module. Note that the resistance of the EGR temperature sensor decreases when the EGR gas volume increases and the temperature of the EGR gas increases.

The EGR temperature sensor terminal voltage becomes higher when the resistance of the EGR temperature sensor increases, and becomes lower when the resistance decreases. Consequently, the EGR temperature sensor terminal voltage varies in accordance with the temperature of the EGR gas becoming lower when the temperature of the EGR gas increases.

Inspection

Harness Inspection

EGR Temperature Sensor Inspection

(1) Remove the EGR temperature sensor.

(2) Place the EGR temperature sensor in water, and then measure the resistance value between terminals 1 and 2 while increasing the water's temperature. Replace the EGR temperature sensor if there is a significant deviation from the standard value.

Installation

(1) Install the EGR temperature sensor, tighten to specified torque.

Specified tightening torque: 10-12 Nm (7.3-8.6 ft.lbs.)