ignition AUDI A4 1997 B5 / 1.G AFC Engine Heated Oxygen Sensor Before Converter Checking Workshop Manual

24-50

- Switch ignition ON.


Specified value: 400 50 mV If the specified value is not obtained, check
wiring to ECM as follows:

- Switch ignition OFF.

- Connect VAG 1598/19 test box to ECM harness
connector page 01
-255
.

- Check wiring for continuity between terminal 4
(HO2S -G39-) and terminal 20 on ECM
connector A.


Specified value: max. 1
- Check wiring for continuity between terminal 4
(HO2S 2 -G108-) and terminal 21 on ECM
connector A.


Specified value: max. 1 If the specified value is not obtained:

- Eliminate short or open circuit in wiring using wiring diagram.
Pa
ge 3 of 7 Heated Ox
yg
en Sensor
(HO2S
) before Three Wa
y Catal
ytic Converter
(TWC
), checkin
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11/22/2002 htt
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