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Measured value blocks
Evaluating measured value blocks, display groups 00 - 05
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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 (idling speed)
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23...27
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760...880 rpm1)
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Injection period
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2...4
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2...4.1 ms
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Throttle valve angle
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4...12
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1.9...5.7 <°
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Operating condition of Lambda control
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See measured value block 99
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Lambda learnt value at idling
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0...100
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-0.8...0.8 ms
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Lambda probe voltage
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0...50
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0.0...1.0 V
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Air mass drawn in
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14...30
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76...164 mg/lift
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Coolant temperature
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170...211
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80...110 °C
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Engine control unit supply voltage
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98...147
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10...15 V
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Intake air temperature
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84...158
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15...71 °C
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1)
Up-to-date specifications:
=> Exhaust emissions test binder
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Display group 1 -Basic functions-
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Read measured value block 1
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⇒
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[ltrif ] Indicated on 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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1
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2
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3
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4
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[ltrif ] Display zones
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Specification
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Evaluation
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Adjustment conditions for matching throttle valve
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00000010
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---
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Lambda probe voltage
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0.00...1.00 V
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Coolant temperature
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80...110 °C
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=> Page 01-70
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Engine speed (idling speed)
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760...880 rpm
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=> Page 01-69
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Evaluation: Engine speed display (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 760 rpm
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- Throttle valve control part sticking or defective
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- Check throttle valve control part
=> Page 24-34
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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 24-73
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More than 880 rpm
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- Idling switch not closed/defective
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- Interrogate fault memory, => Page 01-9
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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 24-73
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- Throttle valve control part sticking/defective
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- Check throttle valve control part
=> Page 24-34
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Evaluation: Coolant temperature display
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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 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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- Thermostat defective
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- Check thermostat
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More than 110 °C
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- Radiator soiled
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- Clean radiator
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- Radiator fan not functioning
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- Check function
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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
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- Check coolant temperature sender
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Note on display zone 4:
Significance of figures in 8-digit number block for the adjustment condition for matching throttle valves:
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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 identified by self-diagnosis 2)
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1
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Signal from automatic gearbox
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1
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Air conditioner switched on
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1
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Idling speed switch open 1)
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1
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Fault in Lambda control
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1
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Throttle valve open (angle check) 1)
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1
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Engine running 1)
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1
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Coolant temperature less than 80 °C
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1)
If there is a "1" in the appropriate position, matching the throttle valve control part is not possible.
2)
If a fault is recognised by the self-diagnosis, which may not as yet be stored in the fault memory. For diagnosis faults which affect the throttle valve control part, matching the throttle valve control part in the function "basic setting" will not be carried out.
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Display group 2 -Basic functions-
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Read measured value block 2
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⇒
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[ltrif ] Indicated on display
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xxxx rpm
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xxx mg/H
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xxx km/h
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xxxx
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1
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2
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3
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4
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[ltrif ] Display zones
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Specification
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Evaluation
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Engine operating condition
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0100
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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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Air mass drawn in (engine load)
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76...164 mg/H
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=> Page 01-72
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Engine speed (idling speed)
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760...880 rpm
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=> Page 01-69
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Evaluation: Air mass drawn in display (engine load)
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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 76 mg/H
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- Large amount of unmetered air between intake manifold and air mass meter
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- Eliminate unmetered air
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More than 164 mg/H
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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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Note on display zone 4:
Significance of figures in 4-digit number block for operating status of engine:
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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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Operating status of engine
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1
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Overrun
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1
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Idling
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1
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Part throttle
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1
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Full throttle
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Display group 3 -Basic functions-
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Read measured value block 3
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⇒
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[ltrif ] Indicated on display
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xxxx rpm
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xxx mg/H
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xx.x <°
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xxx %
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1
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2
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3
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4
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[ltrif ] Display zones
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Specification
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Evaluation
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Throttle valve positioner duty cycle
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-100...100 %
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---
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Throttle valve angle
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1.9...5.7 <°
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=> Page 01-74
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Air mass drawn in (engine load)
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76...164 mg/H
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=> Page 01-72
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Engine speed (idling speed)
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760...880 rpm
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=> Page 01-69
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Evaluation: Throttle valve angle display
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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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More than 5.7 <°
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- Matching to throttle valve control part not carried out
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- Perform matching of throttle valve control part => Page 01-9
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- Throttle valve potentiometer in throttle valve control part defective
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- Check throttle valve control part
=> Page 24-34
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- Accelerator cable adjustment
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- Adjust accelerator cable
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- Throttle valve sticking
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- Eliminate cause
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Display group 4 -Basic functions-
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Read measured value block 4
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⇒
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[ltrif ] Indicated on display
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xxxx rpm
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xxx mg/H
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x.xx 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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[ltrif ] Display zones
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Specification
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Evaluation
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Air mass drawn in
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1.8...3.2 g/s
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---
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Injection period
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2.0...4.10 ms
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=> Page 01-75
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Air mass drawn in (engine load)
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76...164 mg/H
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=> Page 01-72
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Engine speed (idling speed)
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760...880 rpm
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=> Page 01-69
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Evaluation: Display injection 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 2.00 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 01-57
, final control diagnosis
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- Incorrect injectors with greater throughput installed
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- Check injection rate => Page 24-62
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More than 4.10 ms
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- Increased engine load due to electric consumers, air conditioner, gear selected or P.A.S. steering on full lock
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- Eliminate increased load (air conditioner, power assisted steering etc.)
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Display group 5 -Basic functions-
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Read measured value block 5
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⇒
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[ltrif ] Indicated on display
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xxxx rpm
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xx.xx V
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xxx °C
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xxx °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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[ltrif ] Display zones
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Specification
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Evaluation
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Intake air temperature
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15...71 °C
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---
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Coolant temperature
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80...110 °C
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=> Page 01-70
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Engine control unit voltage supply
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10.00...15.00 V
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=> Page 01-77
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Engine speed (idling speed)
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760...880 rpm
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=> Page 01-69
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Evaluation: Engine control unit voltage supply
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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 10.00 V
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- Generator defective, battery heavily discharged
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- Check voltage, charge battery
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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 24-101
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- Current draw when ignition is off
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- Eliminate current draw
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More than 15.00 V
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- Voltage regulator in alternator defective
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- Check voltage, replace regulator if necessary
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- Excess voltage due to jump starting or quick charging unit
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- Interrogate fault memory => Page 01-9
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