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Self-diagnosis
Reading measured value block: Display Groups 11 to 99
Display Group 11: Lambda learned values
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Read measured value block 11
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⇒
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◂ Indicated on display
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2...5
ms
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-0.50...0.50
ms
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0.85...1.15
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xxxxxxxx1)
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Status of fuel tank breather valve (TBV) 1)
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Lambda learned value for part throttle
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Lambda learned value for idling
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Injection period
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1) The spaces marked with an "X" may contain either a 0 or a 1.
Note on display zone 4:
Significance of figures in 8-digit number block for status of fuel tank breather valve:
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x
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x
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x
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x
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x
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x
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x
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x
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Significance when display = 1
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0
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Vacant
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1
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Transition to vapour content check via fuel tank breather valve
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1
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Transition to fuel tank breather valve minimum operating level
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1
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Transition to fuel tank breather valve closure
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1
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Vapour content check via fuel tank breather valve
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1
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Fuel tank breather valve operating normally
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1
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Fuel tank breather valve minimum operating level
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1
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Fuel tank breather valve closed
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Display Group 12: Lambda learned values
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Read measured value block 12
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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-25...25
%
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0.00...1.00
V
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Lambda probe voltage
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Lambda control
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Intake air mass - see Display Group 00
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Engine speed (idling speed)
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Display Group 13: Fuel consumption
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Read measured value block 13
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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0
km/h
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0.5...1.5
ltr/h
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Fuel consumption
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Road speed
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Intake air mass - see Display Group 00
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Engine speed (idling speed)
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Note:
Measured value block 13 is for information only and has no relevance for fault-finding in the workshop.
Display Group 14: Knock control
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Read measured value block 14
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⇒
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◂ Indicated on display
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0.0
°cr/shaft
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0.0
°cr/shaft
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0.0
°cr/shaft
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0.0
°cr/shaft
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Ignition timing retardation by knock control, cylinder 4
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Ignition timing retardation by knock control, cylinder 3
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Ignition timing retardation by knock control, cylinder 2
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Ignition timing retardation by knock control, cylinder 1
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Display Group 15: Knock control
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Read measured value block 15
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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0.0
°cr/shaft
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0.0
°cr/shaft
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Ignition timing retardation by knock control, cylinder 2
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Ignition timing retardation by knock control, cylinder 1
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Intake air mass - see Display Group 00
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Engine speed
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Display Group 16: Knock control
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Read measured value block 16
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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0.0
°cr/shaft
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0.0
°cr/shaft
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Ignition timing retardation by knock control, cylinder 4
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Ignition timing retardation by knock control, cylinder 3
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Intake air mass - see Display Group 00
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Engine speed
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Note:
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◆ As soon as knocking is detected the knock control must retard the ignition angle in order to prevent engine damage.
Display Group 17: Knock control
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Read measured value block 17
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⇒
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◂ Indicated on display
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0.4...1.3
Vss
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0.4...1.3
Vss
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0.4...1.3
Vss
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0.4...1.3
Vss
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Knock sensor voltage signal, cylinder 4
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Knock sensor voltage signal, cylinder 3
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Knock sensor voltage signal, cylinder 2
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Knock sensor voltage signal, cylinder 1
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Display Group 18: Torque reduction on automatics
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Read measured value block 18
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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x.x
°cr/shaft
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0...10
°before TDC
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Ignition timing
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Ignition timing retardation during gearshift
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Intake air mass - see Display Group 00
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Engine speed (idling speed) - see Display Group 00
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Note on display zones 3 and 4:
The ignition timing retardation during a gearshift occurs so rapidly that it cannot always be detected by the V.A.G 1551/1552. The ignition timing value shown in display zone 4 is for information only and has no relevance for fault-finding in the workshop.
Display Group 19: Operating status
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Read measured value block 19
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⇒
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◂ Indicated on display
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760...960
rpm
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0
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0
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0
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Air conditioner compressor (0 = off; 1 = on)
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Air conditioner (0 = off; 1 = on)
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Selector lever position (0 = neutral; 1 = gear engaged)
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Engine speed (idling speed) - see Display Group 00
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Note on display zones 2, 3 and 4:
On vehicles with manual gearbox and no air conditioner these display zones may show either 0 or 1.
Display Group 20: Operating status of lambda control (see also Display Group 99)
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Read measured value block 20
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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80...105
°C
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0XXX011X
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Operating status of lambda control 1)
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Coolant temperature - see Display Group 00
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Intake air mass - see Display Group 00
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Engine speed - see Display Group 00
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1) The spaces marked with an "X" may contain either a 0 or a 1.
Note on display zone 4:
Relevance of figures in 8-digit number block for operating status of lambda control:
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x
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x
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x
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x
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x
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x
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x
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x
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"1" signifies:
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1
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Fault recorded in memory during diagnosis; interrogate fault memory .
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0
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Not allocated
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0
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Not allocated
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1
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Restricted operation mode
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1
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Lambda control at stop limit
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1
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Lambda control switched on
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1
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Lambda probe functioning
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1
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Mixture status:
1 = rich mixture
0 = lean mixture
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Note:
For a more detailed explanation of the 8-digit number block, see Display Group 99 .
Display Group 21: Adaption status of throttle valve control part (see Display Group 98)
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Read measured value block 21
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⇒
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◂ Indicated on display
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0000
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70...93
%
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67...87
%
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6...39
%
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Max. stop of throttle valve
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Emergency running stop of throttle valve
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Min. stop of throttle valve
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Adaption status of throttle valve control part
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Note on display zone 1:
Relevance of figures in 4-digit number block for adaption status of throttle valve control part:
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"1" signifies:
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x
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x
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x
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x
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Adaption status of throttle valve control part
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1
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A fault has occurred during adaption of the throttle valve control part; interrogate fault memory
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1
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No current in throttle valve control part (no duty cycle)
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1
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Adaption terminated because battery voltage is too low (less than 8V)
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1
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Idling speed switch open (switch position check)
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Note:
Measured value block 21 is for information only and has no relevance for fault-finding in the workshop.
Display Group 22: Position of camshaft in relation to crankshaft
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Read measured value block 22
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⇒
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◂ Indicated on display
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760...960
rpm
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100...280
mg/stroke
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27...29
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87...89
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Number of teeth on crankshaft-mounted sender wheel when Hall sender switches from + to -
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Number of teeth on crankshaft-mounted sender wheel when Hall sender switches from - to +
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Intake air mass - see Display Group 00
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Engine speed - see Display Group 00
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Notes on display zones 3 and 4:
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◆ The engine speed sender on the crankshaft transmits both an engine speed signal and a reference mark signal. The reference mark signal is generated by a gap in the sender wheel.
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◆ The Hall sender rotor ring on the camshaft has a 180°division so that for one half of each camshaft revolution it covers the window on the Hall sender and for the other half-revolution the window is exposed.
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◆ To synchronise the components when starting, the engine control unit records the instant when the rotor ring begins to cover the window (signal change from - to + ) and the instant when it begins to expose the window (signal change from + to - ).
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◆ When the reference mark signal on the crankshaft is detected, the engine control unit counts the number of teeth on the crankshaft-mounted sender wheel. As soon as it has counted between 27 and 29 teeth after the gap, the signal sent by the Hall sender on the camshaft should change from - to + (rotor ring begins to cover window). After between 87 and 89 teeth, with the crankshaft already making its second revolution, the Hall sender signal should change from + to - (rotor ring begins to expose window).
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◆ If the signal does not change within the tooth ranges specified above, this may mean that the toothed belt has slipped.
Display Group 97
This Display Group is for factory use only.
The values shown have no relevance for fault-finding in the workshop.
Display Group 98: Adaption of throttle valve control part
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Read measured value block 98
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⇒
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◂ Indicated on display
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3.70...4.75
V
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2.28...4.75
V
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0000
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00
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Adaption status
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Adaption status of throttle valve control part
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Voltage of throttle valve positioner potentiometer -G88
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Voltage of throttle valve potentiometer -G69
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Note on display zone 3:
Relevance of figures in 4-digit number block for adaption status of throttle valve control part:
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Significance when display = 1
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x
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x
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x
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x
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Adaption status of throttle valve control part
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1
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A fault has occurred during adaption of the throttle valve control part; interrogate fault memory
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1
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No current in throttle valve control part (duty cycle = 0)
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1
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Adaption terminated because battery voltage is too low (less than 8V)
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1
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Idling speed switch open (switch position check)
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Note on display zone 4:
Relevance of figures in 2-digit number block for adaption status:
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Significance when display = 1
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x
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x
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Adaption status
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1
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A fault has occurred during adaption of the throttle valve control part; interrogate fault memory => Page 01-10
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1
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Adaption of throttle valve control part in progress
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Display Group 99: Operating status of lambda control
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Read measured value block 99
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⇒
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◂ Indicated on display
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760...960
rpm
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80...105
° C
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-25...25
%
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0XXX011X
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Operating status of lambda control 1)
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Lambda control
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Coolant temperature
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Engine speed
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1) The spaces marked with an "X" may contain either a 0 or a 1.
Note on display zone 4:
Significance of figures in 8-digit number block for operating status of Lambda control:
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x
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x
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x
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x
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x
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x
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x
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x
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Significance when display = 1
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1
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Fault recorded in memory during diagnosis; interrogate fault memory .
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0
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Not allocated
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0
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Not allocated
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1
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Restricted operation mode
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1
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Lambda control at stop limit
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1
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Lambda control switched on
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1
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Lambda probe functioning
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1
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Mixture status:
1 = rich mixture
0 = lean mixture
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Notes on 8-digit number block:
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◆ The 8-digit number block is composed of eight separate elements known as "bits".
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◆ A sequence of bits (e.g. the sequence of eight in the 8-digit number block) is read from right to left. In the above example, the first bit indicates the mixture status, and the eighth bit indicates whether a fault has been recorded in the fault memory.
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◆ If the fifth bit is a "1" (Restricted operation mode), this means that the lambda control is currently operating within a constant engine load range (e.g. idling or driving at a constant engine speed).
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◆ Continued on next page
Notes on 8-digit number block in Display group 99, display zone 4 (cont.):
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◆ Normally the first bit (Mixture status) should fluctuate constantly between "0" and "1".
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◆ If the fourth bit is a "1" (Lambda control at stop limit), the first bit (Mixture status) will indicate which stop limit the lambda control is working at, i.e. rich or lean.
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◆ If the first bit remains constantly at "1", this means that the lambda control is at the "lean" stop limit but that the lambda probe is still registering a "rich" mixture.
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◆ If the first bit remains constantly at "0", this means that the lambda control is at the "rich" stop limit but that the lambda probe is still registering a "lean" mixture.
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◆ The functions of the lambda probe and the lambda control are counterposed, i.e. when the lambda probe is registering "rich" the lambda control must lean down the mixture, and when the lambda probe is registering "lean" the lambda control must enrich the mixture.
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◆ The lambda control cannot be switched off manually.
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