EGR Temperature Sensor: Testing and Inspection

NOTE:
- For a functional check of the EGR temperature sensor,See measuring value block, display group 017.
- Component locations, refer to "Component Overview - II", Locations


- Disconnect EGR temperature sensor harness connector.







- Switch multimeter (Fluke 83 or equivalent) to 20 volt range and connect between both terminals of connector using jumper wires from connector test kit VW 1594.
- Switch ignition ON.
Specified value: approx. 5.0 volts

If the specified value is not obtained:







- Find and eliminate open circuit in wiring between EGR temperature sensor connector terminal 1 and ECM terminal A23, and then between connector terminal 2 and engine Ground (GND), using wiring diagram.


NOTE: If it becomes necessary to repair or replace any of the EGR temperature sensor electrical terminals, ONLY replace with gold plated terminals.


If the specified value is obtained:
- Disconnect multimeter and jumper wires from EGR temperature sensor harness connector.
- Switch ignition OFF.
- Remove EGR temperature sensor.
- Switch multimeter (Fluke 83 or equivalent) to 200 Kohms resistance range and connect to EGR temperature sensor terminals using jumper wires from connector test kit VW 1594.
- Immerse temperature sensor in hot water (80 ° to 100 °C) (176 ° to 212 °F) and measure resistance.
- Resistance must change

If resistance does not change:
- Replace EGR temperature sensor.