AUDI A4 1996 B5 / 1.G ATW Engine Ignition System Repair Manual

28-47

Checking activation

- If installed, slide back rubber grommet on
connector for Camshaft Position (CMP) sensor,
but leave connector connected.

Note:
Connector socket numbers are shown on the rear side of the connector.
Note:
Voltage testers do not go out completely during low current pick-up
between activations by the ECM, but rather continue to glow a little and
then get significantly brighter during activation. - Connect VAG1527B voltage tester between sockets 2 (CMP sensor
signal) and 1 (B+).
- Operate starter for a few seconds.

LED must blink.
Pa
ge 51 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-48
If LED does not blink:

Checking voltage supply

- Disconnect connector at Camshaft Position
(CMP) sensor.

Checking signal wire - Connect multimeter for voltage measurement as follows:Harness connector
Terminal
Measure to
1 Engine Ground (GND)
- Switch ignition on.

Specification: about 5 V
- Connect multimeter for voltage measurement as follows:
Harness connector
Terminal
Measure to
2 Engine Ground (GND)
- Switch ignition on.

Specification: approx. battery voltage
Pa
ge 52 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-49

Checking Ground (GND) wire

If all specified values are being reached and the LED does not blink
(measured between terminal 1 and 2 with starter and connector
connected):
If specified values are not obtained:
Checking wire connections between Camshaft Position (CMP)
sensor and Engine Control Module (ECM) - Check following wire connection for open circuit and short circuit to B+:Harness connector
Terminal
Measure to
3 B+
- Repair open circuit or short circuit if necessary.
- Replace Camshaft Position (CMP) sensor.
- Connect VAG1598/31 test box at wiring harness to Engine Control
Module (ECM), do not connect ECM Page 24
-19
.
Pa
ge 53 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-50


If, after erasing the DTC memory for a test, a DTC relating to the
Camshaft Position (CMP) sensor (hall sensor) is indicated again, even
though all previous tests were OK, the following malfunction is possible:
Repair Manual, 1.8 Liter 4
-Cyl. 5V Turbo Engine Mechanical, Engine
Code(s): AEB, ATW, Repair Group 15; Valvetrain, servicing
- Check following wire connections for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
Terminal
VAG1598/31 test box
Socket
1 (B+) 98
2 (signal) 86
3 (Ground -GND-) 108
- Repair open circuit or short circuit if necessary.

Shutter wheel for Camshaft Position (CMP) sensor is not aligned
properly.
- Unscrew Camshaft Position (CMP) sensor and check whether shutter
wheel is mounted properly at camshaft (if mounted improperly, locking
lug will get squished when mounting bolt is tightened).
- If position of shutter wheel is OK, check allocation of
crankshaft/camshaft.
Pa
ge 54 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-51

Misfire recognition, checking


Special tools and equipment

Test sequence
VAS5051 with VAG5051/1
orVAG1551 with VAG1551/3A
- Connect VAS5051 tester or VAG1551 scan tool and select control
module for engine electronics using "address word" 01 Page 01
-10
.
Engine must run at idle.
Rapid data transfer
HELP
Select function XX

When indicated on display
- Press buttons -0- and -8- to select "Read Measuring Value Block" and
press -Q- button to confirm input.
Read measurin
g value block
Q
Enter displa
y group number XXX

When indicated on display
- Press buttons -0-, -1- and -4- to select "display group number 014" and
press -Q- button to confirm input.
Read Measuring Value Block 14
1
2
3
4

When indicated on display
- Check misfire recognition.
Pa
ge 55 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-52


Display fields

1 2 3 4
Display group 014: Misfire recognition
Display xxx /min xxx %
xxx
---
Indicated Engine
speed
(RPM) Load
Number of ignition misfires
Misfire recognition
Functional
range

activated
locked
Specified
value xxxx/min 15 to
33 % 0
activated
Note
If the specified value is exceeded:
Check combustion misfires of
individual cylinders Page 28
-53


If ignition misfires are to be expected due to
operation conditions (e.g. warm-up,
deceleration shut-down), misfire recognition
is deactivated
If specified value is obtained:

-
Press button.Rapid data transfer
HELP
Select function XX

Indicated on display (function selection):
If specified value is not obtained:
- Press -C- button.
Pa
ge 56 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-53

Check misfire recognition of the individual
cylinders. Read measuring value block
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -1- and -5- to select "display group number 015"
and press -Q- button to confirm input.
Read Measuring Value Block 15
1
2
3
4

When indicated on display
- Check misfire recognition in display fields 1 to 4.

Display fields

1 2 3 4
Display group 015: Misfire recognition of cylinders 1, 2 and 3
Display
xxx
xxx
xxx
---
Indicated
Number of combustion
misfires, cylinder 1 Number of combustion
misfires, cylinder 2 Number of combustion
misfires, cylinder 3 Misfire
recognition
Functional
range


activated
locked
Specified
value 0
0
0
activated
Note
If the specified value is exceeded: Evaluation Page 28
-55

--- Pa
ge 57 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-54

- Press -C- button.Read measuring value block
Q
Enter display group number XXX

When indicated on display
- Press buttons -0-, -1- and -6- to select "display group number 016" and
press -Q- button to confirm input.
Read Measuring Value Block 16
1
2
3
4

When indicated on display
- Check misfire recognition in display fields 1 and 4:

Display fields

1 2 3 4
Display group 016: Misfire recognition of cylinder 4
Display
xxx


---
Indicated
Number of combustion misfires, cylinder 4


Misfire recognition
Functional range



activated
locked
Specified value
0


activated
Note
If the specified value is exceeded: Evaluation Page 28
-55

---
Pa
ge 58 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1

28-55
Evaluation display group 014, display field 3 and display group 015 and 016, display fields 1, 2 and 3. Display field:
3
Possible cause
Corrective action
Larger than 0

spark plug faulty
spark plug connector faulty
Ignition coil or power output stage
faulty - Check spark plugs and ignition wires with connector
- Ignition coils with power output stages. Checking Page
28
-4


Fuel injector faulty- Check fuel injectors Page 24
-38
Pa
ge 59 of 59 I
gnition s
ystem, checkin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.FU06.28.1