1997 AUDI A4 engine

- Disconnect knock sensor harness connectors in
engine compartment.

If there is a short circuit: - Check all three terminals in knock sensor harness connector for
shorting to each other.
Wires must not be short circuited to each other
- Replace knock sensor.
Pa
ge 2 of 6 Knock sensors, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.9

28-30

Checking wiring between knock sensor and
ECM

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

- Check wiring for continuity or short between
knock sensor and ECM using wiring diagram.

Terminal assignments (inside connector)
Knock Sensor (KS) 1 -G61- 1 - Ground (GND) wire
2 - Signal wire
3 - Shield
- Check signal wire for continuity between harness connector terminal 2
(in engine compartment) and test box socket A13.

Specified value: max. 1 - Check Ground (GND) wire for continuity between harness connector
terminal 1 and test box socket A14.

Specified value: max. 1 - Check shielding for continuity between harness connector terminal 3
(in engine compartment) and engine Ground.

Specified value: max. 1
Pa
ge 3 of 6 Knock sensors, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.9

28-31

Knock Sensor (KS) 2 -G66-

- Check signal wire for continuity between
harness connector terminal 2 (in engine
compartment) and test box socket A15.


Specified value: max. 1
- Check Ground (GND) wire for continuity
between harness connector terminal 1 and test
box socket A14.


Specified value: max. 1
- Check shielding for continuity between harness
connector terminal 3 (in engine compartment)
and engine Ground.


Specified value: max. 1 If the specified values are not obtained:

- Eliminate open or short circuit in wiring.
Pa
ge 5 of 6 Knock sensors, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.9

28-32


Knock sensor 1 (bank 1):
Knock sensor terminal
number ECM connector A or engine ground
(GND)
1 (Signal)
2 (Ground)
3 (shield) A13
A14
Engine Ground (GND)
Knock sensor 2 (Bank 2):
Knock sensor terminal
number ECM connector A or engine ground
(GND)
1 (Signal)
2 (Ground)
3 (Shield) A15
A14
Engine Ground (GND)
Pa
ge 6 of 6 Knock sensors, checkin
g
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU01.28.9