EGR Temperature Sensor: Testing and Inspection

Fig. 8 EGR Temperature Sensor (Arrow Points To Harness Connector):

Requirements:
Engine coolant temp. at least 80°C (176°F).
All electrical consumers (including A/C) switched OFF.
Radiator fan must not be running while performing tests.
Vacuum connections must all be tight and without leaks.
Vacuum hoses must not be pinched or plugged.

1. Disconnect the harness plug to the EGR temperature sensor, Fig. 8.
2. Switch multimeter to 20 VDC range.
3. Connect multimeter between terminals 1 and 2 of the harness plug.
4. With the ignition ON, approximately 5 VDC should be available at the plug.
If voltage is not correct, check wiring and repair as necessary.
If voltage is correct, switch OFF ignition and disconnect the multimeter.
5. Remove the EGR temperature sensor from the EGR valve.
6. Switch multimeter to resistance range.
7. Connect the meter across the terminals of the temp. sensor.
8. With the sensor submerged in boiling water, the resistance should be between 80,000 and 160,000 ohms.
If the resistance is not within specification, replace the temperature sensor.
If resistance is OK, re-install the sensor in the EGR valve. Torque the sensor to 20 Nm (15 ft/lb.).
9. Reconnect temperature sensor harness.