EGR Temperature Sensor: Testing and Inspection

PRE-TEST REQUIREMENTS
^ Engine coolant temperature at least 80°C (176°F).
^ All electrical consumers (including A/C) switched OFF.
^ Radiator fan must not run while performing tests.
^ Vacuum connections tight and without leaks.
^ Vacuum hoses not pinched or plugged.

Exhaust Gas Recirculation Component Layout:

TEST PROCEDURE
- Locate and disconnect EGR Temperature Sensor harness connector (# 7 in image).
- Switch multimeter to 20 VDC range.

Connector 2-wire:

- Connect multimeter between terminals of sensor harness connector.
- Turn ignition switch ON, voltage at connector should be:

^ Approximately 5 VDC.

- IF NOT, check wiring and repair as necessary.
- IF YES, turn ignition switch OFF continue with test

EGR Temperature Sensor:

- Remove EGR Temperature Sensor from the EGR valve.
- Switch multimeter to resistance range of 200,000 ohm.
- Connect multimeter to terminals of the EGR Temperature Sensor and record resistance.

^ Resistance should be between 80,000 and 160,000 ohms.

- IF NOT replace sensor.
- IF YES, continue with test.
- With multimeter connected to sensor terminals submerge the sensor in boiling water, i.e. 176° - 212°F (80° - 100°C) and observe resistance reading on meter.

^ Resistance should change from recorded reading in step 7.

- IF NOT replace sensor.
- IF YES, the sensor is good, re-install and torque to 20 Nm (15 ft.lb.).
- Reconnect EGR Temperature Sensor harness connector.