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Evaluating measured value blocks, display groups 14...99
Evaluating measured value blocks, display groups 14...99
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Display group 14 -Knock control-
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Read measured value block 14
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⇒
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◂ Indicated on display
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xxxx rpm
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x.xx ms
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xx.x °CA
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xx.x °CA
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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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Cyl. No. 2 retardation of ignition timing by knock control
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0...15.0 °CA
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---
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Cyl. No. 1 retardation of ignition timing by knock control
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0...15.0 °CA
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---
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Engine load
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0...10.00 ms
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---
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Engine speed
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0...6800 rpm
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---
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Display group 15 -Knock control-
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Read measured value block 15
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⇒
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◂ Indicated on display
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xxxx rpm
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x.xx ms
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xx.x °CA
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xx.x °CA
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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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Cyl. No. 4 retardation of ignition timing by knock control
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0...15.0 °CA
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---
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Cyl. No. 3 retardation of ignition timing by knock control
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0...15.0 °CA
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---
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Engine load
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0...10.00 ms
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---
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Engine speed
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0...6800 rpm
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---
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Notes on display groups 14 and 15:
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◆ The knock control is active from an engine load above 40 %.
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◆ The current ignition timing retardation is displayed when 40 % engine load is exceeded, if below 40 % the last value used will displayed as a constant.
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◆ If pinking is audible but ignition retardation is not noticeable, increase the revs to above 3500 rpm for 5 seconds to initiate the knock sensor fault recognition (diagnosis).
Notes continued:
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◆ If the ignition timing retardation of one cylinder deviates greatly from the others, the following faults are possible:
- Loose sub-assemblies
- Corrosion on the connector
- Engine damage (e.g. oil being burnt due to defective piston)
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◆ If the ignition timing retardation is excessive on all cylinders the following faults are possible:
- Corrosion on the connector
- Knock sensor tightened to incorrect tightening torque (correct tightening torque is 20 Nm)
- Wiring open circuit
- Knock sensor defective
- Loose sub-assemblies
- Poor quality fuel (below 95 RON)
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Display group 16 -knock control-
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Read measured value block 16
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⇒
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◂ Indicated on display
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xxxx V
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x.xxx V
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x.xxx V
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x.xxx V
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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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Cyl. No. 4, knock sensor voltage signal
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0.400...1.400 V
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---
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Cyl. No. 3, knock sensor voltage signal
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0.400...1.400 V
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---
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Cyl. No. 2, knock sensor voltage signal
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0.400...1.400 V
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---
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Cyl. No. 1, knock sensor voltage signal
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0.400...1.400 V
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---
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Notes on display group 16:
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◆ If no wiring or connector fault is determined when checking the knock sensor, check the engine for loose ancillaries or engine damage -see display groups 14 and 15-.
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◆ At high engine speeds the displayed signal voltage for the knock sensors can reach 5.1 Volt.
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◆ If there is more than 50 % difference between the smallest and largest knock sensor signal, the cause could be corrosion on the connector.
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Display group 18 -Altitude adaption-
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Read measured value block 18
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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.xx ms
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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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Altitude correction factor
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-50.0...10.0 %
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---
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Engine load, throttle valve angle
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---
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---
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Engine load
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0.50...1.50 ms
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Engine speed (idling speed)
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780...860 rpm
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=> Page 01-79
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Notes on display group 18, display zone 4:
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◆ The Motronic control unit compares the air mass meter load signal with a load value that is calculated from the throttle valve angle and engine speed. The difference between the two values equates to the altitude correction value.
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◆ - 30 % correspond to an ambient pressure of approx. 700 mbar (30 % below 1000 mbar)
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◆ 15 % correspond to an ambient pressure of approx. 1150 mbar (15 % above 1000 mbar)
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Display group 19 -Torque reduction for automatic gearbox-
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Read measured value block 19
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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 <°
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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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2...18 ° BTDC
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---
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Operating condition
x 1 x = No retardation of ignition
x 0 x = Ignition retardation
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_ x 1 _ _ _ _ x
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---
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Engine load
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0.50...1.50 ms
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=> Page 01-80
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Engine speed (idling speed)
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780...860 rpm
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=> Page 01-79
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Notes on display group 19:
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◆ How the retardation of the ignition timing reduces the engine torque and thereby the shift jerk during a gear shift can be assessed in this display group.
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◆ Due to the very short signals the retardation of the ignition timing is not always recognised and therefore not displayed on V.A.G. 1551/1552.
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◆ Checking ignition timing retardation during gear shift => Page 24-123
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Display group 20 -Operating modes-
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Read measured value block 20
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⇒
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◂ Indicated on display
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xxxx rpm
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Text
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Text
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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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Air conditioner compressor operating mode ON/OFF
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Compr. ON or
Compr. OFF
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---
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Air conditioner operating mode
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A/C-High or
A/C-Low
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---
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Automatic gearbox operating mode (gear selected signal)
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Neutral or
gear selected ON
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---
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Engine speed (idling speed)
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780...860 rpm
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=> Page 01-79
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Notes on display zone 2:
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◆ Neutral = Selector lever in P or N
Gear selected ON = Selector lever in 2/3/4/R/D
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◆ "Neutral" is displayed for vehicles with manual gearbox.
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◆ Checking gear selected signal
Notes on display zone 3:
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◆ A/C-High = Air conditioner demands too high a heating or cooling output
A/C-Low = Air conditioner not switched on.
Notes on display zone 4:
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◆ "Compr. OFF" is always displayed on vehicles without air conditioner.
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◆ Checking signal from and to air conditioner compressor
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Display group 21 -Lambda control-
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Read measured value block 21
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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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xxx.x °C
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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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Lambda control operating mode
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λ-Reg. OFF or
λ-Reg. ON
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---
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Coolant temperature
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-40...125 °C
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---
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Engine load
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0.50...1.50 ms
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=> Page 01-80
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Engine speed (idling speed)
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780...860 rpm
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=> Page 01-79
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Notes on display group 21:
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◆ At a starting temperature of below 15 °C (intake air temperature) the engine control unit will not switch the Lambda regulation on until a coolant temperature of 55 °C is reached.
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◆ For a starting temperature above 15 °C (intake air temperature) the Lambda regulation will commence functioning when the probes are recognised as being operationally ready.
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◆ If the Lambda regulation is switched off the engine runs controlled by the engine map.
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Display group 23 -Adaption of throttle valve control part-
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Read measured value block 23
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⇒
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◂ Indicated on display
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xxxxxx
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xx.x %
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xx.x %
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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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Max. stop of throttle valve positioner
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18.0...54.0 %
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---
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Emergency running stop of throttle valve positioner
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60.0...91.0 %
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---
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Min. stop of throttle valve positioner
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72.0...95.0 %
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---
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Learning requirement display
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100000
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=> Page 01-114
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Note on display zone 1:
If the specification is not obtained, match throttle valve control part to engine control unit => Page 24-111.
Note on display zones 2, 3 and 4:
Displayed is the stop value learnt at the last matching.
Note on all display zones:
If the specification still is not obtained after performing the matching: Check wiring for open and short circuits also the connectors for soiling and corrosion. Only when no wiring fault is found should the throttle valve control part be replaced.
Significance of figures in 6 digit number block, display zone 1 - Learning requirements 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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Significance
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Learning sequence of throttle valve positioner sender (G127) min. stop
0 = Learning sequence performed, learning sequence OK.
1 = Learning sequence not performed, learning sequence not OK.
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Learning sequence of throttle valve positioner sender (G127) max. stop
0 = Learning sequence performed, learning sequence OK.
1 = Learning sequence not performed, learning sequence not OK.
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Learning sequence of throttle valve potentiometer (G69) min. stop
0 = Learning sequence performed, learning sequence OK.
1 = Learning sequence not performed, learning sequence not OK.
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Learning sequence of throttle valve potentiometer (G69) max. stop
0 = Learning sequence performed, learning sequence OK.
1 = Learning sequence not performed, learning sequence not OK.
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Not relevant
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Matching throttle valve potentiometer (G69) to throttle valve sender (G127)
0 = Matching must be performed
1 = Matching performed, matching OK.
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Display group 24 -knock control-
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Read measured value block 24
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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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xx.x°BTDC
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xx.x °CA
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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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Sum of cyls. No. 1...4 ignition retardation angles
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0...45.0 °CA
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---
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Ignition timing
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20°ATDC...42°BTDC
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---
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Engine load
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0...10.00 ms
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---
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Engine speed
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0...6800 rpm
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---
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Notes on display group 24:
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◆ To prevent engine damage the knock control must retard the ignition timing as soon as pinking is recognised.
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◆ Retarding the ignition will though increase the exhaust gas temperature. There is a danger that the catalyst will overheat.
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◆ To prevent this overheating, the mixture is enrichened to lower the exhaust gas temperature when at full load the sum retardation of approx. 10 °CA is reached.
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Display group 25 -Charge pressure control-
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Read measured value block 25
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⇒
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◂ Indicated on display
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x.xx ms
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x.xx ms
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x.xx ms
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xx %
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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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Charge pressure limitation solenoid valve duty cycle
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0...99 %
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---
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Actual engine load (regulated via charge pressure to specified engine load)
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0.50...8.00 ms
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---
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Specified engine load after correction (reduced via knock control, altitude adaption and coolant temperature)
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0.00...8.00 ms
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---
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Specified engine load (mapped value via accelerator pedal position)
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3.00...8.00 ms
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---
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Display roup 95 -Basic functions-
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Read measured value block 95
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.x ms
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xx.x°BTDC
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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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Coolant temperature
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80...110 °C
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=> Page 01-86
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Ignition angle
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12.0 ° BTDC1)
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=> Page 01-81
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Engine load
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0.50...1.50 ms
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=> Page 01-80
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Engine speed (idling speed)
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780...860 rpm
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=> Page 01-79
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1) When selecting the display group 95 under function 04 "Basic setting" the engine control unit will set a fixed ignition timing of approx. 12.0 °BTDC at idling speed.
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Display group 98 -Matching throttle valve control part-1)
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Read measured value block 98
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⇒
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◂ Indicated on display
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x.xxx V
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x.xxx V
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Text
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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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Adapting mode
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ADP. is running or
ADP. OK. or
ADP ERROR
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---
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Engine operating condition
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Idling
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---
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Throttle valve positioner sender voltage (G127)
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0.0...5.0 V
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---
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Throttle valve potentiometer voltage (G69)
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0.0...5.0 V
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---
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1) Matching engine control unit to throttle valve control part => Page 24-111.
Note on display group 98:
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◆ Matching the throttle valve control part is performed with ignition switched on.
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◆ Engine control unit is matched to throttle valve control unit when selecting display group 98 under function 04 "Basic setting". This adaption (matching) must always be carried out when another throttle valve control part (or another complete engine) or another engine control unit is fitted.
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◆ If the voltage supply is interrupted (battery disconnected) the adaption (matching) must be carried out again => Page 24-104 Procedure after voltage supply open circuit.
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Display group 99 -Lambda regulation-
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Read measured value block 99
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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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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
|
Evaluation
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Lambda regulation operating mode
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λ-Reg. OFF or
λ-Reg. ON
|
---
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Lambda regulator
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-10.0...10.0 %
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=> Page 01-92
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Coolant temperature
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-40...125 °C
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---
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Engine speed
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0...6800 rpm
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---
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Notes on display zone 4:
-
◆ For a defined fault finding the Lambda regulation is switched off when selecting display group 99 under "Basic setting" or switched on under "Read measured value block".
When the function 04 "Basic setting" is exited the Lambda regulation is automatically active again.
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◆ It is possible to switch between the function 04 "Basic setting" and the function 08 "Read measured value block" by pressing the keys 4 and 8 on V.A.G 1551/1552.
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