AUDI A8 1997 D2 / 1.G ATQ Engine Ignition System Checking Repair Manual

28-53


Display fields

1 2 3 4
Display group 014: Misfire recognition
Display xxxx/min xxx %
xxx
---
Indicated Engine speed
(RPM) Load
Number of combustion misfires
Misfire
recognition
Functional
range 670 to 6800
RPM 12 to
100 %
activated
locked
Specified
value 720 to 820
RPM
1)
630 to 730
RPM 2) 12 to 26
% 0 to 12
activated
Notes
If the specified value is exceeded: Check combustion
misfires of the individual cylinders Page 28
-54


1) Front Wheel Drive Vehicles 2) All-Wheel Drive Vehicles
If specified value is obtained:

-
Press button.Rapid data transfer
HELP

Indicated on display (function selection):
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Select function XX
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Check misfire recognition of the individual
cylinders.

- Press -C- button.Read Measuring Value Block
Q
Input displa
y 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 to 15
0 to 15
0 to 15
activated
Notes
If the specified value is exceeded: Evaluation Page 28
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- Press -C- button.Read Measuring Value Block
Q
Input display 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 16
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 016: Misfire recognition of cylinders 4, 5 and 6
Display
xxx
xxx
xxx
---
Indicated
Number of combustion
misfires, cylinder 4 Number of combustion
misfires, cylinder 5 Number of combustion
misfires, cylinder 6 Misfire
recognition
Functional
range


activated
locked
Specified
value 0 to 15
0 to 15
0 to 15
activated
Notes
If the specified value is exceeded: Evaluation Page 28
-56

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28-56
Evaluation display group 014, display field 3 and display group 015 and 016, display fields 1, 2 and 3
Indicated on
display
Possible cause
Corrective action
greater than 15

spark plug defective
spark plug connector defective
Ignition coil or power output stage faulty- Check spark plugs and ignition wires with connectors.
- Check ignition coils and power output stages Page
28
-7


Fuel injector faulty- Check fuel injectors Page 24
-36


Poor compression of one or more
cylinders
Repair Manual, Engine Mechanical, Repair Group
15 - Check compression pressure:
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