A4 Sedan V6-2.8L (AFC) (1996)
EGR Temperature Sensor: Testing and Inspection
NOTE:
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For a functional check of the EGR temperature sensor,See measuring value block, display group 017.
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Component locations, refer to "Component Overview - II", See: Powertrain Management/Fuel Delivery and Air Induction/Locations
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Disconnect EGR temperature sensor harness connector.
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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.
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Switch ignition ON.
Specified value: approx. 5.0 volts
If the specified value is not obtained:
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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:
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Disconnect multimeter and jumper wires from EGR temperature sensor harness connector.
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Switch ignition OFF.
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Remove EGR temperature sensor.
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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.
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Immerse temperature sensor in hot water (80 ° to 100 °C) (176 ° to 212 °F) and measure resistance.
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Resistance must change
If resistance does not change: