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Self-diagnosis
Specified display values
Display group 00 on idling (warm engine, coolant temperature not less than +85 °C)
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Read measured value block 0
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⇒
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◂Indicated on display
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190
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44
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78
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191
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9
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128
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129
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137
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127
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128
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Learned value for mixture formation 118...138 O.K.
(=> Display group 08, Page 01-72)
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Learned value for mixture formation 118...138 OK
(=> Display group 08, Page 01-72)
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Control value for mixture formation 78...178 OK
(=> Display group 07, Page 01-71)
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Learned value for idle stabilisation 112...144 OK
(=> Display group 04, Page 01-68)
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Control value for idle stabilisation 112...144 OK. (=> Display Group 05, Page 01-69)
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Throttle angle 0...12 OK (=> Display group 01, Page 01-65)
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Battery voltage 146...212 OK. (=> Check supply voltage, Page 24-67)
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Engine speed: 76...96 OK. (=> Check idling speed, Page 24-9)
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Engine load 10...40 OK. (=> Display Group 01, Page 01-65)
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Coolant temperature: 170...204 OK. (=> Display Group 03, Page 01-67)
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Display group 01 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 1
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⇒
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◂ Indicated on display
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860 rpm
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1.15 ms
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3 <°
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12.0°before TDC
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Ignition timing
▪ 12.0°before TDC OK
▪ < 12.0°before TDC Engine loaded => Switch off consumption units
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Throttle angle
▪ 0...5 <°: OK.
▪ > 5 <°: No adaptation of the throttle valve control unit
▪ Throttle cable incorrectly adjusted => Adjust
▪ Throttle valve control unit defective => Renew
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Engine load (injection period per crankshaft revolution)
▪ 0.50...1.50 ms: OK
▪ < 0.50 ms: Unmetered air downstream of airflow meter => Check intake system
▪ Fuel pressure too high => Check - Page 24-13
▪ > 1.50 ms: Engine loaded => Switch off consumption units
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 02 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 2
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⇒
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◂ Indicated on display
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860 rpm
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1.15 ms
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2.37 ms
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3.7 g/s
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Intake airflow
▪ 1.8...4.0 g/s: OK
▪ < 1.8 g/s: Unmetered air downstream of airflow meter
▪ => Check
▪ > 4.0 g/s: Engine loaded => Switch off consumption units
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Injection period (per working stroke)
▪ 1.00...3.00 ms: OK
▪ < 1.00 ms: High proportion from tank breather system => Page 24-53
▪ > 3.00 ms: Engine loaded => Switch off consumption units
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Engine load (injection period per crankshaft revolution)
▪ 0.50...1.50 ms: OK
▪ < 0.50 ms: Unmetered air downstream of airflow meter => Check intake system
▪ Fuel pressure too high => Check - Page 24-13
▪ > 1.50 ms: Engine loaded => Switch off consumption units
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 03 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 3
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⇒
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◂ Indicated on display
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860 rpm
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13.580 V
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93.6°C
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37.9 °C
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Intake air temperature (at sensor for intake air temperature -G42)
▪ In the event of a line break, a constant temperature of 19.5 °C will be displayed as a substitute value.
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Coolant temperature (at coolant temperature sensor -G62)
▪ 80...105°C: OK
▪ < 80 °C: Run engine until warm
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Battery voltage
▪ 10.000...14.500 V: OK
▪ Outside tolerance: Check supply voltage from engine control unit => Page 24-67
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 04 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 4
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⇒
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◂ Indicated on display
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3 <°
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0.27 g/s
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- 0.04 g/s
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Idling
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Operating status
▪ Idling: OK
▪ Other display: Check idling speed switch => Page 24-59
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Learned value for idling stabilisation for automatic gearbox with gear engaged
▪ - 1.70 1.70 g/s: OK
▪ Less than - 1.70 g/s: Unmetered air downstream of throttle valve
▪ => Check
▪ higher than + 1.70 g/s: Engine loaded => Switch off consumption units
▪ Intake system blocked => Check
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Learned value for idling stabilisation with manual gearbox and with automatic gearbox with no gear engaged
▪ - 1.10 + 1.10 g/s: OK
▪ Less than - 1.10 g/s: Unmetered air downstream of throttle valve => Check
▪ higher than + 1.10 g/s: Engine loaded => Switch off consumption units
▪ Intake system blocked => Check
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Throttle angle
▪ 0...5 <°: OK
▪ > 5 <°: No adaptation of throttle valve control unit => Page 24-57
▪ Throttle cable incorrectly adjusted => Adjust
▪ Throttle valve control unit defective => Renew
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Display group 05 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 5
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⇒
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◂ Indicated on display
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860 rpm
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860 rpm
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0.7 %
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3.7 g/s
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Intake airflow
▪ 1.8...4.0 g/s: OK
▪ < 1.8 g/s: Unmetered air downstream of airflow meter
▪ => Check
▪ > 4.0 g/s: Engine loaded => Switch off consumption units
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Control value for idling stabilisation (idling speed control)
▪ - 10...+ 10 %: OK
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Required engine speed demanded by engine control unit
▪ 820...900 rpm: OK.
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Engine speed (actual)
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 06 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 6
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⇒
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◂ Indicated on display
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860 rpm
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0.7 %
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0.3 %
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12°before TDC
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Ignition timing
▪ 12.0°before TDC OK
▪ < 12.0°before TDC Engine loaded => Switch off consumption units
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Control value for mixture formation (lambda control)
▪ - 10...+ 10 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Control value for idling stabilisation (idling speed control)
▪ - 10...+ 10 %: OK.
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 07 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 7
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⇒
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◂ Indicated on display
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- 0.7 %
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0.755 V
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6 %
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0.87
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Correction factor for mixture formation with active fuel tank breather system
▪ < 1.00: Tank breather supplying rich mixture, lambda control reduces the quantity injected
▪ = 1.00: No fuel tank breather function or fuel tank breather supplying ideal mixture (λ = 1)
▪ > 1.00: Tank breather supplying lean mixture, lambda control increases the quantity injected
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Signal ratio of solenoid valve 1 for activated charcoal filter -N80
▪ 0 %: Solenoid valve closed
▪ 99 %: Solenoid valve open
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Lambda probe voltage (relative to reference earth: 260...300 mV)
▪ Voltage constantly fluctuates back and forth between 0.1 V and 1.0 V: OK.
▪ - 0.1...+ 0.3 V: Large amount of residual oxygen, mixture too lean
▪ 0.7...1.0 V: Small amount of residual oxygen, mixture too rich
▪ Constant 0.45...0.50 V: Lambda probe not functioning
▪ => Test lambda control - Page 24-39.
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Control value for mixture formation (lambda control)
▪ - 10...+ 10 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Display group 08 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 8
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⇒
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◂ Indicated on display
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2.37 ms
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0.4 %
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0.1 %
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TB active
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Tank breather
▪ TB active. Solenoid valve for active carbon canister is pulsed
▪ Tank breather active: Solenoid valve 1 for active carbon canister closed
▪ λ-Adaptation: Mixture formation learning process in progress (solenoid valve 1 for active carbon canister closed)
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Learned value for mixture formation at part load (multiplicative)
▪ - 12...+ 12 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Control value for mixture formation at idling speed (additive)
▪ - 12...+ 12 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Injection period (per engine cycle)
▪ 1.00...3.00 ms: OK
▪ < 1.00 ms: High proportion from tank breather system => Page 24-53
▪ > 3.00 ms: Engine loaded => Switch off consumption units
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Display group 09 on idling (warm engine, coolant temperature not less than +85°C)
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Read measured value block 9
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⇒
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◂ Indicated on display
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860 rpm
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- 0.7 %
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0.755 V
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0.4 %
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Learned value for mixture formation at idling speed (additive)
▪ - 12...+ 12 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Lambda probe voltage (relative to reference earth: 260...300 mV)
▪ Voltage constantly fluctuates between 0.1...+ 0.3 V and 0.7...1.0 V: OK.
▪ - 0.1...+ 0.3 V: Large amount of residual oxygen, mixture too lean
▪ 0.7...1.0 V: Small amount of residual oxygen, mixture too rich
▪ Constant 0.45...0.50 V: Lambda probe not functioning
▪ => Test lambda control - Page 24-39.
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Control value for mixture formation (lambda control)
▪ - 10...+ 10 %: OK
▪ Outside tolerance: Check lambda control => Page 24-39
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 10 on idling (warm engine, coolant temperature not less than +85 °C)
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Read measured value block 10
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◂ Indicated on display
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9 %
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0.87
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17
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0.02
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Air from fuel tank breather system as a proportion of total airflow
▪ 0.00: Tank breather not active
▪ 0.30: 30 % of the intake air is from tank breather
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Fill level of active carbon canister
▪ - 3 %: No petrol vapour in active carbon canister
▪ + 32 %: Active carbon canister completely filled with petrol vapour
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Correction factor for mixture formation with active fuel tank breather system
▪ < 1.00: Tank breather supplying rich mixture, lambda control reduces the quantity injected
▪ = 1.00: (λ = 1)No tank breather supplies ideal mixture (λ = 1)
▪ > 1.00: Tank breather supplying lean mixture, lambda control increases the quantity injected
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Signal ratio of solenoid valve 1 for active carbon canister -N80
▪ 0 %: Solenoid valve closed
▪ 99 %: Solenoid valve open
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Display group 13 at full throttle (test drive in 3rd gear, coolant temperature not less than +85°C)
Warning: The V.A.G 1551 fault reader must be operated by a second person!
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Read measured value block 13
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◂ Indicated on display
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2.3 °KW
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1.9 °KW
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2.5 °KW
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2.4 °KW
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Ignition timing retard, 0.0...12.0 °KW: OK.
▪ Deviation of Cylinders relative to one another less than 6.0 °KW: OK
▪ Deviation greater than 6.0 °KW: loose ancillaries, mechanical damage, corrosion on connectors
▪ All cylinders greater than 12.0 °KW: poor fuel, knock sensor defective, loose ancillaries
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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 16 at idling speed
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Read measured value block 16
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⇒
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◂ Indicated on display
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0.800 V
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0.840 V
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0.800 V
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0.760 V
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Knock sensor signals of all cylinders
▪ Deviation of cylinders relative to one another less than 0.500 V: OK
▪ Deviation greater than 0.500 V. loose ancillaries, mechanical damage, corrosion on connectors
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Knock sensor signal, cylinder 4
▪ 0.400...1.400 V: OK
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Knock sensor signal, cylinder 3
▪ 0.400...1.400 V: OK
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Knock sensor signal, cylinder 2
▪ 0.400...1.400 V: OK
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Knock sensor signal, cylinder 1
▪ 0.400...1.400 V: OK
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Display Group 18 at idling speed
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Read measured value block 18
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⇒
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◂ Indicated on display
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860 rpm
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1.15 ms
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2.15 ms
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- 0.7 %
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Correction factor for mixture formation based on air density (altitude)
▪ No specified result
▪ - 30.0 %: corresponding to an air pressure of approx. 700 mbar (30 % under 1000 mbar)
▪ + 20.0 %: corresponding to an air pressure of approx. 1200 mbar (20 % under 1000 mbar)
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Engine load (injection period per crankshaft revolution) after altitude correction
▪ No specified result
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Engine load (injection period per crankshaft revolution)
▪ 0.50...1.50 ms: OK
▪ < 0.50 ms: Unmetered air downstream of airflow meter => Check intake system
▪ Fuel pressure too high => Check - Page 24-13
▪ > 1.50 ms: Engine loaded => Switch off consumption units
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Engine speed
▪ 820...900 rpm: OK
▪ Outside tolerance: Check idling speed => Page 24-9
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Display group 23 with ignition switched on (engine not running)
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Read measured value block 23
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◂ Indicated on display
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100000
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84.3 %
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75.2 %
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23.9 %
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Upper stop of throttle valve actuator
▪ 18...54 %: OK
▪ Outside tolerance: Perform adaptation of the throttle valve control unit
▪ .
▪ Throttle valve control unit defective
▪ => Renew
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Emergency running stop for throttle valve actuator
▪ 60...91 %: OK
▪ Outside tolerance: Perform adaptation of the throttle valve control unit
▪ => Page 24-57
▪ -Throttle valve control unit defective => Renew
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Lower stop of throttle valve actuator
▪ 72...95 %: OK
▪ Outside tolerance: Perform adaptation of the throttle valve control unit
▪ => Page 24-57 Throttle valve control unit defective => Renew
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Learning demand display
▪ 100000: OK
▪ Other display: Perform adaptation of the throttle valve control unit => Page 24-57
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Display group 25 at full load (test drive in 3rd at approx. 4000 rpm, coolant temperature not less than +85°C)
Warning: The V.A.G 1551 fault reader must be operated by a second person!
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Read measured value block 25
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◂ Indicated on display
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7.40 ms
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7.10 ms
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7.05 ms
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67 %
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Signal ratio (actuation) of the solenoid valve for boost pressure control -N75
▪ No specified result
▪ Constant 5 %: Boost pressure controlled => Interrogate the fault memory
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Actual engine load (regulated by boost pressure to specified engine load)
▪ As specified engine load after correction, display zone 2 (Tolerance
▪ ±0.50 ms) OK
▪ Outside tolerance: Fault in boost pressure control => Page 24-32
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Specified engine load after correction (reduced driver requirement due to knock control, altitude adaptation and coolant temperature)
▪ 3.00...8.00 ms: OK
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Specified engine load before correction (driver's requirement indicated via accelerator pedal)
▪ 3.00...8.00 ms: OK
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Display group 27 at full throttle (test drive in 3rd gear, coolant temperature not less than +85°C)
Warning: The V.A.G 1551 fault reader must be operated by a second person!
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Read measured value block 27
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⇒
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◂ Indicated on display
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1.40 ms
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5.10 ms
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2890 rpm
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67 %
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Signal ratio (actuation) of the solenoid valve for boost pressure control -N75
▪ No specified result
▪ Constant 5 %: Boost pressure controlled => Interrogate the fault memory
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Engine speed
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Engine load (injection period per crankshaft revolution)
▪ 0.50...8.00 ms: OK
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Reduction in the specified engine load due to knock control
▪ < 5.00 ms: OK
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Display group 99 on idling (warm engine, coolant temperature not less than +85 °C)
For fault search, it is possible to jump between "basic setting" and "read measurement value block" by pressing keys 4 and 8. This specifically switches the lambda control off and on.
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Read measured value block 99
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⇒
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◂ Indicated on display
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860 rpm
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93.5 °C
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- 0.7 %
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λ-Control ON
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Lambda control switched on
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Control value for mixture formation (lambda control)
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Coolant temperature
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Engine speed
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Basic setting 99
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⇒
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◂ Indicated on display
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860 rpm
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93.5 °C
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0.0 %
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λ-Control OFF
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Lambda control switched off
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Control value for mixture formation (lambda control)
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Coolant temperature
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Engine speed
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