display AUDI A3 1999 8L / 1.G ATW Engine Ignition System Workshop Manual

28-22
Component location Overview of component
locations Page 24
-5

Test sequence

- 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 display group number XXX

When indicated on display
- Press buttons -0-, -0- and -4- to select "display group number 004" and
press -Q- button to confirm input.
Read Measuring Value Block 4
1
2
3
4

Indicated on display
- Check specified value for Intake Air Temperature (IAT) sensor in
display field 4:
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Display fields

1 2 3 4
Display group 004: Intake Air Temperature (IAT), engine at idle
Display xxxx/min xx.x volts
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery
voltage Coolant
temperature Intake Air Temperature (IAT)
Functional
range
-48.0 to 143.0 C
Specified value xxxx/min 12.0 to 15.0 V
80.0 to 110.0 C
From ambient temperature up to 110
C
1)
1) If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor and sensor wires for
contact resistances and open circuit.
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28-31
Component location Overview of component
locations Page 24
-5

Test requirement:

Engine cold

Test sequence

- 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-, -0- and -4- to select "display group number 004" and
press -Q- button to confirm input.
Read Measuring Value Block 4
1
2
3
4

Indicated on display
- Check indication in display field 3.
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Display fields

1 2 3 4
Display group 004: Coolant temperature, engine at idle
Display xxxx/min xx.x volts
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery
voltage Coolant temperature Intake Air Temperature (IAT)
Functional
range
-48.0 to 143.0 C

Specified value xxxx/min 12.0 to 15.0
V Temperature value must rise
evenly From ambient temperature up to
110 C
If display field 3 does not have a realistic
indication:

- Disconnect connector at coolant temperature
sensor.

Coolant temperature sensor with square
connector:

- Connect multimeter between terminal 1 and 3 of sensor for resistance
measurement.
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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.
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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.
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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

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- 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

---
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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
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