display AUDI A6 1995 C5 / 2.G ATQ Engine Ignition System Checking User Guide
[x] Cancel search | Manufacturer: AUDI, Model Year: 1995, Model line: A6, Model: AUDI A6 1995 C5 / 2.GPages: 65, PDF Size: 0.53 MB
Page 45 of 65
28-40
Evaluation display groups 020/021/022/023/024 - ignition angle retardation
Indicated on display
Possible cause
Corrective action
All cylinders more than 12 KW
Knock sensor faulty- Check knock sensor Page 28
-41
Harness connector corroded
Knock sensor incorrect
tightening torque - Loosen knock sensors and tighten to 20
Nm
Engine accessories loose- Secure engine accessories
Poor fuel quality- Change fuel quality
(see operating instructions)
One cylinder deviates significantly from
the others Harness connector corroded- Check knock sensor Page 28
-41
Engine damage
Repair Manual, Engine Mechanical,
Repair Group 15 - Check compression pressure:
Engine accessories loose- Secure engine accessories
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Page 56 of 65
28-50
- Repair open circuit or short circuit if
necessary.
- If, after erasing DTC memory for the sake of the
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:
Shutter wheel for Camshaft Position (CMP)
sensor is not aligned properly.
Check phase position of Camshaft Position
(CMP) sensor
- 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:
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Page 57 of 65
- Press buttons -0-, -9- and -3- to select "display group number 093" and
press -Q- button to confirm input.
Read Measuring Value Block 93
1
2
3
4
When indicated on display:
- Check specified values of Camshaft Position (CMP) sensor
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Page 58 of 65
28-51
Display fields
1 2 3 4
Display group 093: Phase position of Camshaft Position (CMP) sensor bank 1 and bank 2 with engine at idle.
Display xxx /min xx %
KW
KW
Indicated Engine
speed Engine
load Phase position
Bank 1 Phase position
Bank 2
Functional
range 630 to 6800
RPM 12 to 100
% -20 to 15 KW
-20 to 15 KW
Specified
value 720 to 820
RPM
1)
630 to 730
RPM 2) 12 to 26
% -20 to 15 KW
-20 to 15 KW
Notes
If specified values are not reached, 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).
Repair Manual, Engine, Mechanical, Repair Group 13, removing and installing
toothed belt - Also check engine timing
1) Front Wheel Drive Vehicles 2) All-Wheel Drive Vehicles
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Page 59 of 65
If specified values are obtained:
-
Press button.Rapid data transfer
HELP
Select function XX
Indicated on display (function selection):
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Page 60 of 65
28-52
Misfire recognition, checking
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"
function 08. Press -Q- button to confirm input.
Read Measuring Value Block
Q
Input 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 in display fields 3 and 4.
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Page 61 of 65
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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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Page 63 of 65
28-54
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
-56
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Page 64 of 65
28-55
- 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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Page 65 of 65
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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