A4 Quattro Sedan V6-2.8L (ACK) (1997)
EGR Temperature Sensor: Testing and Inspection
CHECKING PROCEDURE:
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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 Ohms resistance range and connect to EGR temperature sensor terminals using jumper wires
from connector test kit 1594.
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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:
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Replace EGR temperature sensor.