1995 AUDI A8 sensor

28-11
Evaluation of display groups 22, 23 and 24 Display groups: 22, 23 and 24
Possible malfunction
cause
Corrective action
Display fields: 3, 4


All cylinders retarded more than
10 (crankshaft)
Knock sensor faulty- Continuation page 28
-12

Connector corroded
Knock sensor
incorrectly torqued - Loosen knock sensor and tighten to 20 Nm (15 ft lb)
Components loose on
engine - Tighten components
Poor fuel quality- Change fuel
Value for one cylinder different
from the others Connector corroded- Continuation page 28
-12

Engine damage- Check compression Repair Manual, 2.8 Liter V6 5V
Engine Mechanical, Repair Group 15

Components loose on
engine - Tighten components
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28-12

Continuation

- Disconnect 3-pin connector from Knock Sensor
(KS) 1 -G61-.

If resistance is OK (no continuity): - Connect multimeter US1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapters from VW1594
connector test kit.

Connector terminals 1 and 2
Connector terminals 1 and 3
Connector terminals 2 and 3
Specified value:
- Connect VAG1598/22 test box to Motronic ECM harness connector
page 01
-67
.

- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 68
Connector terminal 2 to ECM/test box socket 67
Connector terminal 3 to ECM/test box socket 67
Specified value: max. 1.5
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28-13


If the wiring is OK:
If the malfunction still exists (stored in DTC memory): - Check wiring for short circuits between terminals of 3-pin connector,
and between connector and ECM/test box.

Connector terminal 2 to ECM/test box socket 68
Connector terminal 3 to ECM/test box socket 68
Specified value:
- Loosen knock sensor and tighten to 20 Nm (15 ft lb).
- Replace Knock Sensor (KS) 1 -G61-.
- Check readiness code page 01
-70
.
If Diagnostic Trouble Code (DTC) memory has been erased, or ECM
has been disconnected, generate new readiness code page 01
-73
.
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28-14

- Disconnect 3-pin connector from Knock Sensor
(KS) 2 -G66-.

If resistance is OK (no continuity): - Connect multimeter US1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapters from VW1594
connector test kit.

Connector terminals 1 and 2
Connector terminals 1 and 3
Connector terminals 2 and 3
Specified value:
- Connect VAG1598/22 test box to Motronic ECM harness connector
page 01
-67
.

- Check wiring for open circuit between ECM/test box and 3-pin harness
connector, according to wiring diagram.

Connector terminal 1 to ECM/test box socket 60
Connector terminal 2 to ECM/test box socket 67
Connector terminal 3 to ECM/test box socket 67
Specified value: max. 1.5
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pair&id=AUDI.B5.FU03.28.1

28-15


If the wiring is OK:
If the malfunction still exists (stored in DTC memory): - Check wiring for short circuits between terminals of 3-pin connector,
and between connector and ECM/test box.

Connector terminal 2 to ECM/test box socket 60
Connector terminal 3 to ECM/test box socket 60
Specified value:
- Loosen knock sensor and tighten to 20 Nm (15 ft lb).
- Replace Knock Sensor (KS) 2 -G66-.
- Check readiness code page 01
-70
.
If Diagnostic Trouble Code (DTC) memory has been erased, or ECM
has been disconnected, generate new readiness code page 01
-73
.
Pa
ge 18 of 34 Motronic i
gnition s
ystem
11/23/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU03.28.1