1999 AUDI A4 technical data

28-7
If displayed values are OK:

- Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
generate new readiness code Page 01
-62
.

-
Press button to advance program
sequence.
- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
Evaluating display group 20 Display group: 20
Display fields: 1-4
Possible cause

Correcting action

All cylinders retarded more
than 10 (crankshaft)
Knock sensor faulty- Continuation Page 28
-8

Connector corroded
Knock sensor
incorrectly torqued - Loosen knock sensor and re-tighten to 20 Nm (15 ft lb)
Components loose
on engine - Tighten components
Pa
ge 9 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

Poor fuel quality- Change fuel
One cylinder reading is very
different from the others Connector corroded- Continuation Page 28
-8

Engine failure- Check compression Repair Manual, 1.8 Liter 4
-Cyl. 5V
Turbo Engine Mechanical, Engine Code(s): AEB, ATW, Repair Group 15


Components loose
on engine - Tighten components
Pa
ge 10 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

28-8

Continuation

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

If resistance is OK (no continuity): - Connect multimeter US 1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapter cables from VW
1594 connector test kit.

Connector terminal 1 to terminal 2
Connector terminal 1 to terminal 3
Connector terminal 2 to terminal 3
Specified value:
- Connect VAG 1598/22 test box to Motronic ECM harness connector
Page 01
-56
.

- 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 2
Specified value: max. 1.5
Pa
ge 11 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

28-9

- 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

Connector terminal 3 to ECM/test box
socket 67

Specified value:
If the wiring is OK:

- Loosen knock sensor and re-tighten to 20 Nm
(15 ft lb).
If the malfunction still exists (stored in DTC
memory):

- Replace Knock Sensor (KS) 1 -G61-.

-
Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
Pa
ge 12 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

generate new readiness code Page 01
-62
.
Pa
ge 13 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

28-10

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

If resistance is OK (no continuity): - Connect multimeter US 1119 (Fluke 83 or equivalent) to measure
resistance between connector terminals, using adapter cables from VW
1594 connector test kit.

Connector terminal 1 to terminal 2
Connector terminal 1 to terminal 3
Connector terminal 2 to terminal 3
Specified value:
- Connect VAG 1598/22 test box to Motronic ECM harness connector
Page 01
-56
.

- 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 2
Specified value: max. 1.5
Pa
ge 14 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

28-11

- 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

Connector terminal 3 to ECM/test box
socket 67

Specified value:
If the wiring is OK:

- Loosen knock sensor and re-tighten to 20 Nm
(15 ft lb).
If the malfunction still exists (stored in DTC
memory):

- Replace Knock Sensor (KS) 2 -G66-.

-
Check readiness code Page 01
-59
. If
Diagnostic Trouble Code (DTC) memory has
been erased, or ECM was disconnected,
Pa
ge 15 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1

generate new readiness code Page 01
-62
.
Pa
ge 16 of 22 Technical data, s
park
plugs
11/19/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU02.28.1