display AUDI A6 1995 C5 / 2.G ATQ Engine Ignition System Checking Workshop Manual

28-15
Component location Overview of Component
Locations, page Page 24
-5

Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .

Ignition must remain switched on for this.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
Input 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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28-16


Display fields

1 2 3 4
Display group 004: Intake Air Temperature (IAT), engine at idle
Display xxxx/min xx.xxx volts
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery voltage Coolant
temperature Intake Air Temperature (IAT)
Functional
range 630 to 6800 RPM 10.000 to 15.000
V -48.0 to 143.0 C
-48.0 to 143.0 C
Specified value xxxx/min 12.000 to 15.000
V 80.0 to 110.0 C
From ambient temperature up to 120
C
1)
1) Approximate values: While driving, up to 24 C above ambient temperature. If heated while standing, up to 120 C is
possible.
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28-24
Component location Overview of Component
Locations, page Page 24
-5

Test requirement:

Engine cold

Test sequence

- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .

Engine must run at idle for this.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
Input 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 indication in display field 3.
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28-25


Display fields

1 2 3 4
Display group 004: Coolant temperature, engine at idle
Display xxxx/min xx.xxx V
xxx.x C
xxx.x C
Indicated Engine speed
(RPM) Battery voltage
Coolant temperature Intake Air Temperature (IAT)
Functional
range 630 to 6800 RPM 10.000 to
15.000 V -48.0 to 143.0 C
-48.0 to 143.0 C
Specified
value xxxx/min 12.000 to
15.000 V Temperature value must rise
evenly From ambient temperature up to
120 C
If display field 3 does not have a realistic
indication:

Note:
Intake air hose between Mass Air Flow (MAF)
sensor and intake air elbow must be removed in
order to be able to reach the coolant temperature
sensor.

- Disconnect connector at coolant temperature
sensor.
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28-34

Check ignition angle retardation of the
individual cylinders

- Connect VAS5051 tester or VAG1551 scan tool
and select the control module for engine
electronics using "address word" 01 Page 01
-
9 .

Engine must run at idle for this.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 Measuring Value Block
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -2- and -0- to select "display group number 020" and
press -Q- button to confirm input.
Read Measuring Value Block 20
1
2
3
4

When indicated on display:
- Check indication in all display fields.
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28-35


Display fields

1 2 3 4
Display group 020: Ignition -knock control in driving operation
Display
xx.x KW
xx.x KW
xx.x KW
xx.x KW
Indicated
Ignition angle
retardation cylinder 1
via knock control
Knock sensor control Ignition angle
retardation cylinder 2
via knock control
Knock sensor control Ignition angle
retardation cylinder 3
via knock control
Knock sensor control Ignition angle
retardation cylinder 4
via knock control
Knock sensor control
Specified
value 0 to 12 KW
0 to 12 KW
0 to 12 KW
0 to 12 KW
Notes Evaluation Page 28
-40

Note:
The number values indicated in display fields 1 to 4 represent actual ignition angle retardation via knock control of the
individual cylinders. Ignition angle retardation occurs in KW (crankshaft degrees) toward retardation.
- Press -C- button.Read Measuring Value Block
Q
Input display group number XXX

When indicated on display:
- Press buttons -0-, -2- and -1- to select "display group number 021" and press -
Q- button to confirm input.
Read Measuring Value Block 21
1
2
3
4

When indicated on display:
- Check indication in display field 1 and 2.
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28-36


Display fields

1 2 3 4
Display group 021: Ignition -knock control in driving operation
Display
xx.x KW
xx.x KW


Indicated
Ignition angle retardation cylinder 5 via
knock control
Knock sensor control Ignition angle retardation cylinder 6 via
knock control
Knock sensor control

Specified
value 0 to 12 KW
0 to 12 KW


Notes Evaluation Page 28
-40



Note:
The number values indicated in display fields 1 and 2 represent actual ignition angle retardation via knock control of the
individual cylinders. Ignition angle retardation occurs in KW (crankshaft degrees) toward retardation.
- Press -C- button.Read Measurin
g Value Block
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -2- and -2- to select "display group number 022" and press -Q-
button to confirm input.
Read Measuring Value Block 22
1
2
3
4

When indicated on display:
- Check indications in display field 3 and 4.
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28-37


Display fields

1 2 3 4
Display group 022: Ignition -knock control in driving operation
Display xxxx/min xxx.x %
xx.x KW
xx.x KW
Indicated Engine speed
(RPM) Engine
load Ignition angle retardation cylinder 1
via knock control
Knock sensor control Ignition angle retardation cylinder 2
via knock control
Knock sensor control
Specified
value xxxx/min 12 to 100
% 0 to 12 KW
0 to 12 KW
Notes Evaluation Page 28
-40

Note:
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders
1 and 2. Ignition angle retardation occurs in KW (crankshaft degrees) toward retardation.
- Press -C- button.Read Measurin
g Value Block
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -2- and -3- to select "display group number 023" and press -Q-
button to confirm input.
Read Measuring Value Block 23
1
2
3
4

When indicated on display:
- Check indications in display field 3 and 4.
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28-38


Display fields

1 2 3 4
Display group 023: Ignition -knock control in driving operation
Display xxxx/min xxx.x %
xx.x KW
xx.x KW
Indicated Engine speed
(RPM) Engine
load Ignition angle retardation cylinder 3
via knock control
Knock sensor control Ignition angle retardation cylinder 4
via knock control
Knock sensor control
Specified
value xxxx/min 12 to 100
% 0 to 12 KW
0 to 12 KW
Notes Evaluation Page 28
-40

Note:
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders
3 and 4. Ignition angle retardation occurs in KW (crankshaft degrees) toward retardation.
- Press -C- button.Read Measurin
g Value Block
Q
Input displa
y group number XXX

When indicated on display:
- Press buttons -0-, -2- and -4- to select "display group number 024" and press -Q-
button to confirm input.
Read Measuring Value Block 24
1
2
3
4

When indicated on display:
- Check indications in display field 3 and 4.
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28-39


Display fields

1 2 3 4
Display group 024: Ignition -knock control in driving operation
Display xxxx/min xxx.x %
xx.x KW
xx.x KW
Indicated Engine speed
(RPM) Engine
load Ignition angle retardation cylinder 5
via knock control
Knock sensor control Ignition angle retardation cylinder 6
via knock control
Knock sensor control
Specified
value xxxx/min 12 to 100
% 0 to 12 KW
0 to 12 KW
Notes Evaluation Page 28
-40

Note:
The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders
5 and 6. Ignition angle retardation occurs in KW (crankshaft degrees) toward retardation.
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