wiring diagram AUDI A4 1999 B5 / 1.G AFC Engine Exhaust Gas Recirculation Temperature Senzor Checking Workshop Manual

24-72
If the specified value is not obtained:

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