1996 AUDI A4 buttons

28-5

Knock sensor and knock sensor
system, checking


Required special tools and test equipment

VAG 1551/1552 Scan Tool (ST) with adapter
cable VAG 1551/3
VAG 1598/22 test box
Multimeter US 1119 (Fluke 83 or equivalent)
VW 1594 connector test kit
Wiring diagrams

Checking

- Connect VAG 1551/1552 Scan Tool (ST) and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Pa
ge 5 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

Read Measurin
g Value Block
HELP
Input display group number XXX

Indicated on display
- Press buttons -0-, -2- and -0- to input display group number 20, and
press -Q- button to confirm input.
Pa
ge 6 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

28-7
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

28-12

Misfiring recognition, checking


Required special tools and test equipment

VAG 1551 or VAG 1552 Scan Tool (ST) with
VAG 1551/3 adapter cable

Checking

- Connect VAG 1551/1552 Scan Tool (ST) and
press buttons -0- and -1- to insert "Engine
Electronics" address word 01 (engine running at
idle) Page 01
-7 .
Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block"
function 08, and press -Q- button to confirm input.
Read Measuring Value Block
HELP
Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -1- and -4- to input display group number 14, and
press -Q- button to confirm input.
Read Measuring Value Block 14 1 2 3 4

Indicated on display (1-4 display groups)
Pa
ge 17 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

- Press buttons -0- and -6- to select "End Output"
function 06, and press -Q- button to confirm
input.
Pa
ge 19 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

28-14
If displayed values are NOT OK:

- Press -C- button.

- Press buttons -0-, -1- and -5- to input display
group number 15, and press -Q- button to
confirm input. Read Measuring Value Block 15 1 2 3 4

Indicated on display (1-4 display groups) - Compare displayed values with specified values for misfire recognition
(display fields 1-4):

Display groups

1 2 3 4
Display group 15: Misfire recognition
Display xxx xxx xxx activated
deact
Indicates Misfire harmful to
emissions, Cyl. 1 Misfire harmful to
emissions, Cyl. 2 Misfire harmful to
emissions, Cyl. 3 Misfire recognition
status
Range 500 500 500 ---
Specified
value 0-5 0-5 0-5 activated

If displayed values are NOT OK Page 28
-16
, Evaluating display groups 15 and 16
Pa
ge 20 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

28-15
If displayed values are OK:

- Press -C- button.

- Press buttons -0-, -1- and -6- to input display
group number 16, and press -Q- button to
confirm input. Read Measuring Value Block 16 1 2 3 4

Indicated on display (1-4 display groups) - Compare displayed values with specified values for misfire recognition
(display fields 1 and 4):

Display groups

1 2 3 4
Display group 16: Misfire recognition
Display xxx activated
deact
Indicates Misfire harmful to emissions, Cyl. 4 Misfire recognition status
Range 500 ---
Specified value 0-5 activated

If displayed values are NOT OK Page 28
-16
, Evaluating display groups 15 and 16
Pa
ge 21 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