ignition AUDI A4 1995 B5 / 1.G APB Engine Ignition System Checking
[x] Cancel search | Manufacturer: AUDI, Model Year: 1995, Model line: A4, Model: AUDI A4 1995 B5 / 1.GPages: 64, PDF Size: 0.37 MB
Page 42 of 64
28-37
Display Group 22 -Ignition- Knock control
Driving mode
Read measuring value block
22
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 2 0...12 KW
(crankshaft
angle)
Page 28
-40
Ignition timing retard via knock control:
cylinder 1
0...12 KW
(crankshaft
angle)
Page 28
-40
Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 1
and 2. The ignition timing retard occurs via KW (crankshaft angle).
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1
Page 43 of 64
28-38
Display Group 23 -Ignition- Knock control
Driving mode
Read measuring value block
23
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 4 0...12 KW
(crankshaft
angle)
Page 28
-40
Ignition timing retard via knock control:
cylinder 3
0...12 KW
(crankshaft
angle)
Page 28
-40
Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 3
and 4. The ignition timing retard occurs via KW (crankshaft angle).
Pa
ge 43 of 64 I
gnition s
ystem, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1
Page 44 of 64
28-39
Display Group 24 -Ignition- Knock control
Driving mode
Read measuring value block
24
Indicated on display
xx.x RPM x.x %
xx.x KW
xx.x KW
1 2
3 4
Display fields
Specified value
Evaluation
Ignition timing retard via knock control:
cylinder 6 0...12 KW
(crankshaft
angle)
Page 28
-40
Ignition timing retard via knock control:
cylinder 5
0...12 KW
(crankshaft
angle)
Page 28
-40
Engine load 15 - 175 %
Engine speed RPM
750 - 6800 RPM
Note:
The displayed digit values in display fields 3 and 4 reflects the actual "ignition timing retard" via knock control from cylinders 5
and 6. The ignition timing retard occurs via KW (crankshaft angle).
Pa
ge 44 of 64 I
gnition s
ystem, checkin
g
11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1
Page 45 of 64
28-40
Evaluation display groups 20/21/22/23/24, - Ignition timing angle retard Indicated on display
Malfunction cause
Corrective action
All cylinders greater
than 12 KW
Knock sensor faulty- Check knock sensor Page 28
-41
.
Corroded connection
Knock sensor incorrect
tightening torque - Loosen and tighten knock sensor with 20 Nm (15 ft lb)
Components on engine
loose - Tighten components
Low fuel grade- Change fuel grade
One cylinder deviates
clearly from others Corroded connection- Check knock sensor Page 28
-41
.
Engine damage
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine
Code(s): APB, Repair Group 15, Cylinder head removing, check compression pressure
- Check compression pressure:
Components on engine
loose - Tighten components
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e=re
pair&id=AUDI.B5.FU04.28.1
Page 53 of 64
28-46
- Operate starter for few seconds.
The diode test lamp should blink briefly once
every two engine revolutions.
Note:
Diode test lamps with a low current draw
continue to glow faintly between impulses from
the engine control module (rather than going out
completely) and become much brighter when
receiving an impulse.
If the diode test lamp does not flash, test the
voltage supply.
Checking voltage supply for Hall sensor
- Disconnect harness connector from relevant Hall
sensor.
- Switch ignition on.
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pair&id=AUDI.B5.FU04.28.1
Page 61 of 64
28-54
Evaluation display group 014, display field 3 Display field:
3
Possible cause
Corrective action
greater 15
Spark plug faulty
Spark plug connector faulty
Ignition coil or power output stage faulty- Check spark plug and ignition cable with
connector
- Check ignition coil Page 28
-5 .
- Check power output stages Page 28
-11
Fuel injector faulty
Check compression of one or more cylinder
weak - Check fuel injectors Page 24
-39
- Check compression pressure
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pair&id=AUDI.B5.FU04.28.1
Page 64 of 64
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Evaluation display groups 015 and 016 Display field: 1,2 and 3 from measuring
value block 15 and 16
Possible cause
Corrective action
greater 15
Spark plug faultySpark plug connector faulty Ignition coil or power output stage
faulty - Check spark plug and ignition
cable with connector
- Check ignition coil Page 28
-5 .
- Check power output stages
Page 28
-11
Fuel injector faultyCheck compression of one or
more cylinder weak - Check fuel injectors Page 24
-39
- Check compression pressure
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU04.28.1