1999 AUDI A4 display

28-17

Intake Air Temperature (IAT) sensor -
G42, checking

Location of sensor and connector Page 24
-5 .

- Connect vehicle diagnostic, testing and
information system VAS 5051 or VAG1551 scan
tool and select engine electronics control
module by entering address word "01" Page
01
-9 . When doing this the ignition must be
switched on.
Rapid data transfer
HELP
Select Function XX

Indicated on display
- Press buttons -0- and -8- to select function "Read Measuring Value
Block" and confirm entry with -Q- button.
Read Measurin
g Value Block
HELP
Input Displa
y Group Number XXX

Indicated on display
- Press buttons -0-, -0- and -4- to select Display Group 4 and confirm
entry with -Q- button.
Read Measuring Value Block 4
1
2
3
4

Indicated on display: (1...4 display fields) - Check display value for intake air temperature sensor (display field 4):
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28-18


Display fields

1 2 3 4
Display Group 004: Intake air temperature with engine idling
Display xxxx rpm xx.xxx V
xxx.x C
xxx.x C
Indicates Engine speed Battery voltage Coolant temperature
Intake air temperature
Work range min.: 750 RPM
max.: 6800 RPM min.:10.000 V
max.: 15.000 V min.: -48.0 C
max.: 143.0 C
min.: -48.0 C
max.: 143.0 C
Specified value xxxx RPM 12.000...15.000 V
80.0...110.0 C
Between ambient temp. and 120 C
1)
1) If there is a large difference between the temperature displayed and the ambient temperature at the sensor, check the
sensor and sensor wiring for contact resistance and open circuit.
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28-26

Rapid data transfer
HELP
Select function XX

Indicated on display
- Press buttons -0- and -8- to select function "Read Measuring Value
Block" and confirm entry with -Q- button.
Read Measuring Value Block Input displa
y group number XXX

Indicated on display
- Press buttons -0-, -0- and -4- to select Display Group 4 and confirm
entry with -Q- button.
Read Measuring Value Block 4
1
2
3
4

Indicated on display
- Check readout for coolant temperature sender in display field 3.
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28-27


Display fields

1 2 3 4
Display Group 004: Coolant temperature with engine idle
Display xxxx RPM xx.xxx V
xxx.x C
xxx.x C
Indicates Engine speed RPM Battery voltage
Coolant temperature Intake air temperature
Specified value XXXX RPM 12.000...14.500 V
Temperature must increase evenly Ambient temperature
until 120 C
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28-28
If display field 3 does not display a realistic
value:

- Disconnect harness connector from coolant
temperature sensor.

Coolant temperature sensor with square
connector:

- Connect multi-meter (resistance measurement) between terminals 1
and 3 of sensor.
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pair&id=AUDI.B5.FU04.28.1

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:
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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).
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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).
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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