EGR Temperature Sensor: Description and Operation

Fig. 123 E.G.R. TEMPERATURE SENDER:

Used by the fuel injection and ignition ECU:

PURPOSE
The sensor (mounted in the EGR pipe) measures the temperature of the exhaust gases returning to the intake manifold. By detecting the temperature variations, The control unit can determine whether or not the EGR system is operating.

DESIGN
The sensor is of the PTC (positive temperature coefficient) type and is designed to measure temperatures up to 932°F (500°C). PTC means that the resistance increases as temperature increases.

NOTE: Since the sensor is highly sensitive to shock and impact, particular care must be taken when handling and installing it.