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Evaluating measured value blocks, display groups 0...6 -Basic functions-
Evaluating measured value blocks, display groups 0...6 -Basic functions-
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Display group 001 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 1
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.x °C
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x.x %
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xxxxxxxx
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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 zones
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Specification
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Evaluation
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Adjustment conditions for basic setting
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11111111
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Lambda regulator before catalyst
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-10.0...10.0 %
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=> Page 01-150
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Coolant temperature
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80...110 °C
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=> Page 01-131
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Significance of 8-digit number block for readiness code
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Significance if display = 1
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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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Significance
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1
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Coolant temperature above 80 °C
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1
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Speed below 2000 rpm
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1
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Throttle valve closed
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1
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Lambda regulation OK.
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1
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Idling switch closed
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1
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Air conditioner compressor switched off
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1
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Catalyst temperature above 350 °C
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1
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No faults recognised by self-diagnosis
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Evaluating display group 1, display zone 1 - Engine speed (idling 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 650 rpm
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- Throttle valve control part sticking or defective
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- Check throttle valve control part
=> Page 24-57
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- Large amount of unmetered air (cannot be compensated for by the idling stabilisation)
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- Check intake air system for leaks
=> Page 24-108
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More than 750 rpm
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- Idling switch not closed/defective
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- Interrogate fault memory, => Page 01-16
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- Large amount of unmetered air (cannot be compensated for by the idling stabilisation)
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- Check intake air system for leaks
=> Page 24-108
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- Throttle valve control part sticking/defective
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- Check throttle valve control part
=> Page 24-57
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- Supply voltage too low, engine tries to reduce charge difference through increased idling speed
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- Check alternator
=> Page 01-130
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- Air conditioner operating too long at idling speed
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- Switch off air conditioner, give throttle burst, possibly restart engine.
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Display group 2 -Basic functions- Air mass meter
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▪ Engine running at idling speed
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Read measured value block 2
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx %
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x.x ms
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x.x g/s
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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 zones
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Specification
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Evaluation
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Air mass taken in
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2.5...5.0 g/s
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=> Page 01-127
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Injection period
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1.0...4.0 ms
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=> Page 01-127
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Engine load
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12...26 %
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=> Page 01-136
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note on display zone 4:
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◆ Displayed is the air mass measured by the air mass meter.
Evaluating display group 2, display zone 3 - Injection period
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 1.00 ms
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- Large amount of fuel from the activated charcoal filter system
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- Check activated charcoal filter solenoid valve 1 => Page 01-89, Final control diagnosis
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- Incorrect injectors with greater throughput installed
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- Check injection rate => Page 24-89
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More than 4.0 ms
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- Increased engine load due to electric consumers, air conditioner, gear selected or P.A.S. on full lock
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- Eliminate increased load (air conditioner, power assisted steering etc.)
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Evaluating display group 2, display zone 4 - Air mass drawn in
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 2.5 g/s
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- Large amount of unmetered air between intake manifold and air mass meter
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- Rectify unmetered air
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More than 5.0 g/s
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- Gear selected (automatic gearbox)
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- Place selector lever in P or N
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- Engine loaded due to ancillaries
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- Eliminate load (air conditioner, power assisted steering etc.)
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Display group 3 -Basic function- Air mass meter
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▪ Engine running at idling speed
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Read measured value block 3
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⇒
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◂ Indicated on display
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xxxx rpm
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x.xx ms
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x.x %
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xx.x°BTDC
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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 zones
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Specification
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Evaluation
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Ignition angle
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6...15 ° BTDC
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---
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Throttle valve angle (potentiometer 1 -G187)
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0.2...4.0 %
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=> Page 01-136
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Air mass taken in
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2.5...5.0 g/s
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=> Page 01-127
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note on display zone 3:
Display values must be approx. 100 % when accelerator pedal is fully depressed.
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Display group 4 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 4
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.xxx V
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xxx.x °C
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xxx.x °C
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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 zones
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Specification
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Evaluation
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Intake air temperature
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-48...143.0 °C
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Coolant temperature
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80...110 °C
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=> Page 01-131
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Voltage supply for engine control unit
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12.0...15.0 V
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=> Page 01-130
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note on display zone 3:
The engine control unit will use the intake air temperature as a replacement value for an engine start (start temperature - replacement value) as soon as there is a fault stored in the fault memory, which affects the coolant temperature sender (G62). The temperature then rises according to a model stored in the control unit. When the engine has reached normal working temperature a fixed replacement value will be displayed after a certain period. This fixed value is also dependent upon the intake air temperature.
Note on display zone 4:
The total temperature range is given as the specification. The displayed value must be above ambient temperature.
Evaluating display group 4, display zone 2 - Control unit voltage supply
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Appears on display
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Possible fault cause
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Fault elimination
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less than 12.0 V
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- Alternator defective, battery heavily discharged
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- Check alternator and battery voltage, charge battery:
=> Electrical system folder
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- Battery heavily charged shortly after starting due to high charging current and current consumers
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- Increase revs slightly for a few minutes and switch off current consumers
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- Transfer resistance in the current supply or the engine control unit earth connection
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- Check engine control unit voltage supply => Page 24-142
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- Current draw when ignition is off
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- Eliminate current draw
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greater than 15.0 V
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- Voltage regulator on alternator defective
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- Check voltage regulator, renew if necessary:
=> Electrical system folder
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- Excess voltage due to jump starting or quick charging unit
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- Interrogate fault memory => Page 01-16
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Evaluating display group 4, display zone 3 - Coolant temperature
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 80 °C
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- Engine too cold
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- If necessary carry out test drive
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- Coolant temperature sender or wiring to engine control unit
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- Check coolant temperature sender
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Greater than 110 °C
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- Radiator soiled
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- Clean radiator
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- Radiator fan does not function
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- Check function:
=> Electrical system folder
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- Thermostat defective
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- Check thermostat
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- Coolant temperature sender or wiring to engine control unit defective
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- Check coolant temperature sender
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Constant -40.0 °C
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- Wiring open circuit or short to positive
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Constant 140 °C
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- Short to earth
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- Check coolant temperature sender
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Evaluating display group 4, display zone 4 - Intake air temperature
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Appears on display
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Possible fault cause
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Fault elimination
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Constant -40.0 °C
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- Wiring open circuit or short to positive
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Constant 140 °C
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- Short to earth
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- Check coolant temperature sender
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Display group 5 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 5
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx %
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xxx km/h
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Text
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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 zones
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Specification
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Evaluation
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Operating mode (idling, part throttle, enrichment, overrun)
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Idling
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---
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Road speed
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0 km/h
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---
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Engine load
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12...26 %
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=> Page 01-136
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Display group 6 -Basic function-
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▪ Engine running at idling speed
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Read measured value block 6
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx %
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xxx.x °C
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xx.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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◂ Display zones
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Specification
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Evaluation
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Elevation correction factor
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-50.0...10.0 %
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---
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Intake air temperature
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-48...143.0 °C
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=> Page 01-132
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Engine load
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12...26 %
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=> Page 01-136
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note on display zone 3:
The total temperature range is given as the specification. The displayed value must be above ambient temperature.
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