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Motronic Injection and Ignition System (4-cyl.)
Page 1 of 10
Self diagnosis
Read measured value block: Display Groups 08 to 99
Display Group 08 - Lambda learned values
Indicated on display
Read measured value block 08
2.0...5.0
ms
-10...+10
%
-8...+8
%
TB
active
or
TB n.
active
" TB active " (TB = fuel tank purge system) means that
solenoid valve 1 for activated charcoal filter is opening and
closing at intervals (i.e. is active) for a period of between 6
and 16 minutes.
" TB n. active " means that solenoid valve 1 for activated
charcoal filter remains closed (i.e. is not active) for a
period of 1 minute.
Lambda learned value at part throttle (multiplicative)
Lambda learned value when idling (additive)
Injection period
Test table, Display Group 08
Display zone
Readout on V.A.G 1551
1
2
and
3
Low lambda learned values
Cause of fault
- See Display Group
02, display zone 3
= & gt; Page 01-96
- Low lambda
learned values for
idling and normal
lambda learned
values for part
throttle: oil may be
diluted with petrol
(high petrol content
in oil)
- Leak in injector
- Fuel pressure too
high
- Solenoid valve 1
for activated
charcoal filter -N80
constantly open
- Air mass meter G70 defective
- Lambda probe
heating defective or
lambda probe dirty
Fault remedy
- Disappears after
motorway run or oil
change
Display Group 07,
display zone 2
= & gt; Page 01-108
- Check injector
= & gt; Page 24-25
- Check fuel
pressure
= & gt; Page 24-17
- Test -N80 = & gt; Page
24-49
- Test -G70 = & gt; Page
24-33
- Test lambda probe
heating
= & gt; Page 24-44
Note on display zones 2 and 3:
Low learned values mean that the engine is running too rich, and the lambda control compensates by leaning
out the mixture.
Test table, Display Group 08
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Motronic Injection and Ignition System (4-cyl.)
Display zone
2
and
3
Page 2 of 10
Readout on V.A.G 1551
High lambda learned values
Cause of fault
- High lambda
learned values for
idling and lower
lambda learned
values for part
throttle: unmetered
air possible around
intake manifold
Fault remedy
- Rectify fault
Display Group 07,
display zone 2
= & gt; Page 01-108
- Injector blocked
- Check injection
quantity
= & gt; Page 24-21
- Values in display
zones 2 and 3 too
high: air mass meter
-G70 defective
- Test -G70 = & gt; Page
24-33
- Fuel pressure too
low
- Check fuel
pressure
= & gt; Page 24-17
- Unmetered air
between -G70 and
throttle valve
- Unmetered air at
manifold gasket
- Lambda probe
heating defective or
lambda probe dirty
- Rectify fault
- Test lambda probe
heating
= & gt; Page 24-44
Note on display zones 2 and 3:
High learned values mean that the engine is running too lean, and the lambda control compensates by
enriching the mixture.
If there is no voltage in the control unit, all the learned values will be set to zero.
Display Group 09 - Lambda learned values:
Read measured value block 9
-10...+10
0...1,0
rpm
%
V
Indicated on display
-10...+10
%
Lambda learned value for idling (additive)
Lambda probe voltage
Lambda control
Engine speed shown in steps of 10 rpm
Display Group 10 - Fuel tank purge system:
Read measured value block 10
0....99
0.3...1.2
-3...+32
%
Indicated on display
0.00...0.30
Activated charcoal filter purging rate (ACF):
Readout " 0.00 " = nothing supplied from ACF system
Readout " 0.30 " = 30%of intake air mass supplied from
ACF system
Fill level of activated charcoal filter system:
-3 means there is no petrol vapour in the activated charcoal filter
system.
+32 means the activated charcoal filter system is full of petrol vapour.
Lambda correction factor for active fuel tank purging
Duty cycle for solenoid valve 1 for activated charcoal filter (ACF)
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Motronic Injection and Ignition System (4-cyl.)
Page 3 of 10
Note on display zone 4:
The display shows the percentage of the overall intake volume which is supplied via the ACF system.
Display Group 11 - Fuel consumption:
Indicated on display
Read measured value block 11
760...840 1.0...2.5
0
rpm
ms
km/h
0.5...1.5
ltr/h
Fuel consumption:
The specified value shown on the display relates only to
idling without additional load from ancillaries (automatic
gearbox, air conditioner, alternator, power steering pump).
Road speed
Engine load
Engine speed shown in steps of 40 rpm
Notes on display zone 2:
The maximum engine load falls by around 10% for every 1000 m above sea level.
The maximum engine load also falls by up to 10% at very high ambient temperatures.
The values when driving at full throttle should be no less than the following:
- approx. 7.5 ms at 4000 rpm
- approx. 6.5 ms at 6000 rpm
Display Group 12 - Fuel consumption:
Indicated on display
Read measured value block 12
760...840
rpm
10...14.5
V
0.5...1.5
ltr/h
3...12°
before
TDC
Ignition timing - see Display Group 01, display zone 4
= & gt; Page 01-91
Fuel consumption - see Display Group 11, display zone 4 = & gt; Page 01115
Battery voltage - see Display Group 03, display zone 2 = & gt; Page 01-99
Engine speed - see Display Group 01, display zone 1= & gt; Page 01-91
Display Group 13 - Knock control:
Read measured value block 13
0..15°
0..15°
0..15°
crankshaft crankshaft crankshaft
Indicated on display
0..15°
crankshaft
Ignition timing retardation by knock control, cylinder 4
Ignition timing retardation by knock control, cylinder 3
Ignition timing retardation by knock control, cylinder 2
Ignition timing retardation by knock control, cylinder 1
Notes on Display Group 13:
The knock control operates at engine loads of 40% or more.
At engine loads of more than 40% the display will show the current (instantaneous) ignition timing
retardation values. At engine loads of less than 40% the display will show the last values used
(constant readout).
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Motronic Injection and Ignition System (4-cyl.)
Page 4 of 10
If there is audible knocking and no perceptible ignition timing retardation, increase the engine speed to
above 3500 rpm for 5 seconds in order to activate the knock sensor fault recognition (diagnosis)
function.
If there is a significant difference between the ignition timing retardation value for one of the cylinders
and the values for the other cylinders, the following faults are possible:
- Loose ancillaries
- Corrosion on plug connector
- Engine damage (e.g. oil burning because of defective piston)
Notes on Display Group 13:
If the ignition timing retardation values for all the cylinders are high, the following faults are possible:
- Corrosion on plug connector
- Wrong tightening torque (should be 20 Nm)
- Open circuit in wiring
- Knock sensor defective
- Loose ancillaries
- Poor-quality fuel (less than RON 95)
Display Group 14 - Knock control:
Read measured value block 14
0..15°
rpm
ms
crankshaft
Indicated on display
0..15°
crankshaft
Ignition timing retardation by knock control, cylinder 2
Ignition timing retardation by knock control, cylinder 1
Engine load (injection period per revolution)
Engine speed shown in steps of 40 rpm
Note on Display Group 14:
With this display group it is possible to check the ignition timing retardation for cylinders 1 and 2 at certain
engine speeds and under certain load conditions.
Display Group 15 - Knock control:
Read measured value block 15
0..15°
rpm
ms
crankshaft
Indicated on display
0..15°
crankshaft
Ignition timing retardation by knock control, cylinder 4
Ignition timing retardation by knock control, cylinder 3
Engine load (injection period per revolution)
Engine speed shown in steps of 40 rpm
Note on Display Group 15:
With this display group it is possible to check the ignition timing retardation for cylinders 3 and 4 at
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Motronic Injection and Ignition System (4-cyl.)
Page 5 of 10
certain engine speeds and under certain load conditions.
Causes of ignition timing retardation: Display Group 13 = & gt; Page 01-117.
Display Group 16 - Knock control (idling):
Read measured value block 16
0.4...2.0 0.4...2.0 0.4...2.0
V
V
V
Indicated on display
0.4...2.0
V
Knock sensor signal, cylinder 4
Knock sensor signal, cylinder 3
Knock sensor signal, cylinder 2
Knock sensor signal, cylinder 1
Notes:
If the difference between the highest and lowest knock control signals is more than 50%, this may be
due to corrosion on the plug connector.
If no faults are found as a result of the electrical test of the knock sensor, wiring and plug connector,
check the engine for loose ancillaries and mechanical damage. See Display Group 13 = & gt; Page 01117 .
At higher engine speeds and engine loads the voltage signal displayed for the knock sensors can
reach values of up to 5.1 volts.
Display Group 17 - Catalyst heating:
Indicated on display
Read measured value block 17
rpm
ms
0...100
%
....°
before
TDC
Ignition timing
Energy balance for catalyst heating
Engine load (injection period per revolution)
Engine speed shown in steps of 40 rpm
Notes on Display Group 17:
To bring the catalyst up to operating temperature as quickly as possible after a cold start, the idling
speed is increased and the ignition timing retarded. In the part throttle range only the ignition timing
retardation remains activated.
The rapid catalyst heating function is activated at starting temperatures of -9 to +39°
C.
Notes on Display Group 17:
The function is aborted under the following conditions:
- Engine speed greater than 4000 rpm
- Engine load greater than 7.0 ms
- Fault registered in fault memory for air mass meter and coolant temperature sender
- Energy balance greater than 1.0
- Road speed greater than 55 km/h
- Altitude correction factor less than -20 % (Display Group 18)
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Motronic Injection and Ignition System (4-cyl.)
Page 6 of 10
When the function is aborted the display readout for the energy balance remains frozen and is reset to
zero the next time the engine is started.
Display Group 18 - Altitude adaption:
Indicated on display
Read measured value block 18
rpm
ms
ms
-50...+15
%
Altitude correction factor
Engine load from throttle valve angle
Engine load from air mass meter
Engine speed shown in steps of 40 rpm
Notes on Display Group 18:
The engine control unit compares the load signal from the air mass meter with a load value calculated
on the basis of the throttle valve angle and the engine speed. The difference between the two values is
the altitude correction factor.
At an altitude of approx. 400 m above sea level and under normal weather conditions, altitude adaption
is not necessary.
- The correction factor at sea level is approx. 0%.
- At an altitude of 2000 m the correction factor is approx. -20%.
The altitude adaption affects the following functions:
- Determining of injection quantity for starting
- Intake manifold pulsation compensation
Display Group 19 - Torque reduction (automatic gearbox)
Read measured value block 19
rpm
ms
X1X
Indicated on display
°
cr/shaft
Ignition timing
Operating state:
X 1 X = no gearshift signal
X 0 X = gearshift signal
X = (no meaning)
Engine load
Engine speed shown in steps of 40 rpm
Notes on Display Group 19:
This Display Group shows whether the engine control unit is receiving the gearshift signal from the
gearbox control unit.
Because the signal is only brief the V.A.G 1551 does not always recognise the ignition timing
retardation.
Display Group 20 - Operating conditions:
Read measured value block 20
Neutral
A/Crpm
Gear
High
engag
A/C-Low
Indicated on display
Compr.ON
Compr.OFF
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Motronic Injection and Ignition System (4-cyl.)
Page 7 of 10
Air conditioner compressor ON/OFF
On vehicles with no air conditioner the display will always
read " Compr.OFF " .
Air conditioner
High = high hot/cold air output
Low = low hot/cold air output
On vehicles with no air conditioner the display will always read " ACLow " .
Selector lever in Neutral or with gear engaged
On vehicles with manual gearboxes the display will always read " Neutral " .
Engine speed shown in steps of 10 rpm
Display Group 21 - Operating conditions for lambda control:
Indicated on display
Read measured value block 21
rpm
ms
λctrl.OFF
λctrl.ON
°C
Lambda control OFF/ON
Coolant temperature
Engine load
Engine load shown in steps of 40 rpm
Notes on Display Group 21:
The lambda control is activated by the engine control unit on the basis of the engine temperature, the
engine temperature when starting and the intake air temperature.
When the lambda control is switched off the engine runs according to the map stored in the control
unit.
Display Group 23 - Adaption of throttle valve positioner
Read measured value block 23
73...97
54...85
01000000
%
%
Indicated on display
6...43 %
Max. stop of throttle valve positioner -V60
Emergency running stop of throttle valve positioner -V60
Min. stop of throttle valve positioner -V60
Learning requirement display
Note on display zone 1:
If the display does not show the specified value, perform adaption of throttle valve control part -J338 = & gt; Page
24-54.
Note on display zone 2, 3 and 4:
The display will show the stop values learned at the last basic setting.
Note on display zones 1, 2, 3 and 4:
If the display still does not show the specified value even after the basic setting has been performed, check
the wiring for open circuits or short circuits and also check the plug connections for dirt or corrosion before
fitting a new throttle valve control part.
X
X
X
X
X
X
X
X
Relevance of figures in 8-digit display
1 = (irrelevant)
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Motronic Injection and Ignition System (4-cyl.)
Page 8 of 10
2 = Min. stop learning process for throttle
valve positioner sender -G127
0 = learning process completed; learning
process OK
1 = learning process not completed; learning
process not OK
3 = Max. stop learning process for throttle
valve positioner sender -G127
0 = learning process completed; learning
process OK
1 = learning process not completed; learning
process not OK
4 = Min. stop learning process for throttle
valve potentiometer -G69
0 = learning process completed; learning
process OK
1 = learning process not completed; learning
process not OK
5 = Max. stop learning process for throttle
valve potentiometer -G69
0 = learning process completed; learning
process OK
1 = learning process not completed; learning
process not OK
6 = (irrelevant)
7 = Match throttle valve potentiometer -G69
with throttle valve positioner
sender -G127
0 = matching process needs to be carried out
1 = matching process complete; match
achieved
8 = (irrelevant)
Display Group 24 - Knock control:
Read measured value block 24
°before
rpm
ms
TDC
Indicated on display
° cr/shaft
Total ignition timing retardation for cylinders 1 to 4
Ignition timing
Engine load
Engine speed shown in steps of 40 rpm
Notes on Display Group 24:
The knock control must retard the ignition timing as soon as knocking is detected in order to prevent
damage to the engine.
Ignition timing retardation increases the exhaust temperature, which means there is a risk that the
catalyst (catalytic converter) will overheat.
Retarding the ignition timing in all the cylinders by, for example, 3°in relation to the crankshaft h as
exactly the same effect as retarding it by 12° on ly one of the cylinders.
in
To avoid overheating, a richer mixture is supplied when the total ignition timing retardation exceeds
approx. 10° full throttle. This has the effect of reducing the exhaust temperature.
at
Display Group 25 - Camshaft timing control
Read measured value block 25
-30...+30
....
X X0
° cr/shaft
Indicated on display
-3....+22
° cr/shaft
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Motronic Injection and Ignition System (4-cyl.)
Page 9 of 10
Active camshaft adjustment angle
Camshaft in normal position = -3.0 ... 3.0°
cranksha ft angle
Camshaft in adjusted position = 15.0 ... 22.0°
crank shaft
angle
Operating state:
X X0 = camshaft adjustment OFF (late)
0 = condition not met; control inactive
1 = condition met; control active
X = (irrelevant)
Adjustment discrepancy with phase sender (Hall sender)
Operating state: idling, part throttle, full throttle, overrun, enrichment
Notes on Display Group 25:
See Display Group 26 = & gt; Page 01-131
Display Group 26 - Camshaft timing control
Indicated on display
Read measured value block 26
rpm
ms
X X0
-3....+22
° cr/shaft
Activated camshaft adjustment angle
Camshaft in normal position = -3.0 ... 3.0°
cranksha ft angle
Camshaft in adjusted position = 15.0 ... 22.0°
crank shaft
angle
Operating state:
X X0 = camshaft adjustment OFF (late)
0 = condition not met; control not activated
1 = condition met; control activated; adjustment taking place
X = (irrelevant)
Engine load
Engine speed
Note on display zone 4:
The camshaft timing control has only two positions, i.e. the normal position and the adjusted position. To
move the camshaft into the adjusted position, run the car slowly (approx. 1000 rpm) in second gear and
accelerate at full throttle to around 4000 rpm. If the camshaft adjustment control has been activated (see
display zone 3), display zone 4 will show whether the camshaft position has in fact been adjusted (feed-back
signal). If the adjustment control has not been activated, check whether the unit is registering full throttle
(camshaft adjustment only functions at full throttle).
Display Group 98 - Adaption of throttle valve control part:
Indicated on display
Basic setting 98
0...5
V
0...5
V
Idling
Part throt
ADP.
runs
ADP.
O.K.
ADP
ERROR
Adaption state
ADP. = adaption of throttle valve control part
Operating state
Voltage of potentiometer for idling speed positioner
Voltage of throttle valve potentiometer
Note on display zone 4:
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Motronic Injection and Ignition System (4-cyl.)
Page 10 of 10
ADP. = Adaption. Checking adaption of throttle valve control part = & gt; Page 24-54
Display Group 99 - Lambda control:
Indicated on display
Read measured value block 99
rpm
°C
-10...+10
%
λ ctrl.
OFF
λctrl. ON
Lambda control OFF/ON
Basic setting 04: λctrl. OFF
Read measured value block 08: λctrl. ON
Lambda control
Coolant temperature
Engine speed
Notes on Display Group 99:
To assist fault-finding, the lambda mixture control function is de-activated when Display Group 99 is
selected in " Basic setting 04 " and activated when it is selected in " Read measured value block 08 " .
The lambda mixture control function is automatically re-activated by exiting from function 04 " Basic
setting " .
By pressing the keys 4 and 8 on the V.A.G 1551 it is possible to switch back and forth between
function 04 " Basic setting " and function 08 " Read measured value block " .
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