timing AUDI A4 1996 B5 / 1.G APB Engine Ignition System Checking

28-4
Technical data, ignition system

Engine code
APB
Engine idle RPM
Not adjustable - controlled by
Idle Air Control (IAC) 750 - 850 RPM
RPM limit

Operates by closing
throttle valve
Operates by shutting off
fuel injectors
approx. 6800 RPM
Ignition timing is determined
by the control module.
Ignition timing cannot be
adjusted.
Ignition system Single-coil system with 6 ignition coils located above spark plug connectors and installed
directly on spark plugs. The power output stages are located as separate components in air
cleaner housing.
Spark plugs connectors Resistance approx.: 2K Ohm
Firing order 1-4-3-6-2-5
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28-35
Measuring value blocks for ignition timing angle retard Display Group 20 -Ignition- Knock control

Driving mode
Read measuring value block 20

Indicated on display

xx.x KW
xx.x KW
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



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


Note:
Pa
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gnition s
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11/22/2002 htt
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yp
e=re
pair&id=AUDI.B5.FU04.28.1

The displayed digit values in display fields 1 to 4 reflects the actual "ignition timing retard" via knock control from the individual
cylinders. The ignition timing retard occurs via KW (crankshaft angle).
Pa
ge 40 of 64 I
gnition s
ystem, checkin
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11/22/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
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yp
e=re
pair&id=AUDI.B5.FU04.28.1

28-36

Display Group 21 -Ignition- Knock control

Driving mode
Read measuring value block 21

Indicated on display

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

Note:
The displayed digit values in display fields 1 and 2 reflects the actual "ignition timing retard" via knock control from the
individual cylinders. The ignition timing retard occurs via KW (crankshaft angle).
Pa
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gnition s
ystem, checkin
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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

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).
Pa
ge 42 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

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

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

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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gnition s
ystem, checkin
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28-51

Read Measuring Value Block 93
1
2
3
4

Indicated on display
- Check specified display values for Hall sensors.

Display fields

1 2 3 4
Display Group 093: Phase positions of Hall sensors (Bank 1 and Bank 2) with engine idling
Display xxx RPM xx %
0 6 KW
0 6 KW
Indicates Engine
speed
(RPM) Engine
load Phase position
Bank 1 Phase position
Bank 2
Work
range min.: 750
RPM
max.: 6800
RPM min.: 15
%
max.:
175 % -20.3 to 14.8 KW
-20.3 to 14.8 KW
Specified
value 750 - 850
RPM
0 6 KW
0 6 KW
Note
If readouts do not match specifications, unbolt Hall sensor and check whether
rotor ring is properly mounted on camshaft. If it is incorrectly mounted, the
locating lug will be flattened when the securing bolt is tightened. Also check
valve timing.
Repair Manual, 2.7 Liter V6 5V BiTurbo Engine Mechanical, Engine Code(s): APB,
Repair Group 13, Crankcase ventilation, Ribbed belt removing and installing, Timing belt removing and installing

Pa
ge 58 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