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Self-diagnosis
Display group overview, engine codes AFT, AKS
Evaluation of display group 00
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Display group 00 (decimal displayed value)
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▪ Engine running at idling speed
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Read measured value block 0
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[ltrif ] Indicated on display
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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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x
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x
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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[ltrif ] Display zones
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Specification
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Corresponds to
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Engine speed
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24...28
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768...896 rpm1)
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Injection period
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2...4
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2...4 ms
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Throttle valve angle
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5...11
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2.5...4.7 <°
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Operating condition
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not relevant
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Learnt value for Lambda control (additive)
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0...20
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0...0.64 ms
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Lambda probe voltage
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10...50
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0.2...1.0 V
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Engine load signal
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30...45
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11.7...17.5 %
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Coolant temperature
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120...150
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80...110 °C
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Engine control unit voltage supply
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115...161
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12...16.5 V
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Intake air temperature
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70...160
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4.5...72 °C
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1)
Up-to-date specifications:
=> Exhaust emissions test binder
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Display zones
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1
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2
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3
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4
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Display group 01
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Display
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xxxx rpm
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xxx °C
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x.xx V
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xxxxxxxx
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780...880 rpm2)
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80...110 °C
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0.2...1.0 V
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00000010
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Indicated
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Engine speed
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Coolant temperature
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Lambda probe voltage
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Adjustment conditions1)
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Display group 02
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Display
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xxxx rpm
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xx.xx ms
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xx.xx V
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xxx °C
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780...880 rpm2)
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2...4 ms
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12...16.5 V
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20...70 °C
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Indicated
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Engine speed
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Injection period
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Battery voltage
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Intake air temperature
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Display group 03
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Display
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xxxx rpm
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xxx %
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xx.x <°
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xxx %
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780...880 rpm2)
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12...17 %
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3.0...4.5 <°
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10...20 %
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Indicated
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Engine speed
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Engine load signal
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Throttle valve angle
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Throttle valve positioner duty cycle (idling control)
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1)
Relevance of numbers in 8 digit number block
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2)
Up-to-date specifications:
=> Exhaust emissions test binder
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Display zones
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1
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2
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3
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4
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Display group 04
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Display
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xxxx rpm
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xxx %
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xxx km/h
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xxxxxxxx
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780...880 rpm3)
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12...17 %
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0 km/h
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01000000
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Indicated
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Engine speed
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Engine load signal
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Speed signal
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Engine operating condition1)
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Display group 05
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Display
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xxxx rpm
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xxx %
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x.xx ms
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xxxxxxxx
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780...880 rpm3)
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7...9 %
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---
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0000101x
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Indicated
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Engine speed
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Duty cycle valve for activated charcoal filter
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Consumption signal
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Operating condition Lambda control2)
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1)
Relevance of numbers in 8 digit number block => Page 01-65
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2)
Relevance of figures in 8 digit number block => Page 01-66
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3)
Up-to-date specifications:
=> Exhaust emissions test binder
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Display zones
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1
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2
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3
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4
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Display group 06
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Display
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x.xx ms
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x.xx
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x.xx
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x.xx
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0.00...0.60 ms
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0.90...1.10
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0.90...1.10
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0.90...1.10
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Indicated
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Learnt value for Lambda control at idling (Additive)
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Learnt value for Lambda control in part load / full load (Multiplicative)
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Learnt value for throttle valve positioner duty cycle (idling speed control)
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Learnt value for throttle valve positioner duty cycle on automatic gearbox (idling speed control)
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Display group 07
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Display
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xx
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xx
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x.xx
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xxxxxxxx
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57...60 or 1
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5...8
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0.80...1.20
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00000000
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Indicated
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Coordination Hall sender to engine speed sender
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Coordination Hall sender to engine speed sender
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Altitude correction value
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Operating condition throttle valve control part1)
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1)
Relevance of figures in 8 digit number block => Page 01-66
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Evaluating display group 00
Engine codes AFT, AKS
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Display zone: 1Intake air temperature
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 601)
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Intake air temperature sender
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- Check intake air temperature sender => Page 24-76
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More than 1101)
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Display zone: 2Battery voltage
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 115
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Alternator defective
Battery discharged/defective
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- Check control unit voltage supply => Page 24-90
Check alternator
Check battery
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- Consumer switched on
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- Switch off consumer
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More than 161
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Voltage regulator defective
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- Check voltage regulator
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1)
Depends upon ambient temperature and time vehicle is parked.
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Display zone: 3Coolant temperature
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 120
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Coolant temperature sender
Thermostat defective (open)
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- Check thermostat => Repair group 19
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More than 150
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Coolant temperature sender
- Fan defective
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- Check coolant temperature sender => Page 24-72
Check fan
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Display zone: 4Engine load signal
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 30
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Unmetered air
- Air cleaner dirty
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- Check intake air system for leaks => Page 24-108
Check air cleaner
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More than 45
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Consumer switched on
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- Switch off consumer
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Display zone: 5Lambda probe voltage
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Constant 79
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Lambda control blocked
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- Check Lambda probe and Lambda control => Page 24-41
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in lower specification range
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Unmetered air
Insufficient fuel
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- Check intake air system for leaks (unmetered air) => Page 24-108
Check amount of fuel in tank
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Display zone: 6Learnt value for Lambda control at idling (Additive)
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Adaption figure
more than 201)
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Oil dilution
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- Change oil or carry out a fast drive on country roads
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Fuel pressure too high
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- Check fuel pressure regulator
=> Page 24-104
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- Fuel pressure too low
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- Fuel return pipe blocked / kinked
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- Check return pipe => Repair group 20
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Injector leaking
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- Check injectors => Page 24-98
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- Injector not opening or only opening partially
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Lambda probe heating
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- Check Lambda probe heating
=> Page 24-48
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- Unmetered air in air intake system or exhaust manifold/front pipe
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- Check intake air system for leaks (unmetered air) => Page 24-108
Check exhaust system => Repair group 26
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1)
It is not possible to establish from adaption value, whether the idling mixture is being adapted in rich or lean direction.
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Display zone: 8Throttle valve angle
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 5
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Unmetered air in air intake system or exhaust manifold/front pipe
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- Check intake air system for leaks (unmetered air) => Page 24-108
Check exhaust system => Repair group 26
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More than 11
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Basic setting of throttle valve control part has not been performed
Throttle valve control part defective
Throttle cable adjustment
- Consumer switched on
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- Perform basic setting => Page 24-59
Adjust throttle cable => Repair group 20
Switch off consumer
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Display zone: 9Injection period
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 2
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Fuel pressure regulator defective/hose fallen off
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- Check fuel pressure regulator => Page 24-104
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More than 4
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Consumer switched on
Lambda control on limit
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- Switch off consumer
Check Lambda probe and Lambda control => Page 24-41
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Display zone:10Engine speed
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V.A.G 1551 display
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Possible fault cause
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Fault elimination
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Less than 24
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Throttle valve control part defective
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- Check throttle valve control part => Page 24-59
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More than 28
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Throttle valve control part defective
Unmetered air
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- Check throttle valve control part => Page 24-108
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Continuation of all engine codes
Relevance of figures in 8 digit number block for adjustment conditions and operating condition.
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Significance when displayed digit = 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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x
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x
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x
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x
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Adjustment conditions (display group 01)
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Engine operating condition (display group 04)
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1
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Fault recognized by self-diagnosis1)
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Overrun
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1
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Signal from automatic gearbox
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Idling
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1
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Air conditioner compressor switched on
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Part load
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1
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Idling switch open
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Full load
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1
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Fault in the Lambda control
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Not relevant
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1
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Throttle valve opened
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Not relevant
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1
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Engine running
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Not relevant
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1
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Coolant temperature below 80 °C
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Not relevant
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1)
Fault recognized by self-diagnosis that may not as yet be stored in the fault memory.
Relevance of figures in 8 digit number block for Lambda control and throttle valve control part.
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Relevance when displayed digit = 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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x
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x
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x
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x
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Lambda control operating condition
(display group 05)
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Throttle valve control part operating condition (display group 07)
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1
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Coding for Syncro
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Mechanical emergency running
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1
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Not relevant
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Not relevant
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1
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Not relevant
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Adaption necessary
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1
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Lambda control at limit
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Adaption necessary
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1
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Lambda control active
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Not relevant
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1
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Fault in fault memory
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Adaption terminated (battery voltage too low)
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1
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Lambda probe operationally ready
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Adaption terminated (time exceeded)
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1
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Rich mixture (0 = lean mixture)
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Idling switch open
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‒ Additional measures see Repair procedures:
Notes:
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◆ Press ⇒ button to end read measured value block.
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◆ After terminating read measured value block input 06 for "End output" function and confirm with Q.
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