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Evaluating measured value blocks, display groups 50...69 -Speed regulation-
Evaluating measured value blocks, display groups 50...69 -Speed regulation-
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Display group 50 -Speed regulation- Idling speed boost
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▪ Engine running at idling speed
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Read measured value block 50
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⇒
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◂ Indicated on display
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xxxx rpm
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xxxx rpm
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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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Engine speed (specified idling speed):
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820 rpm
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---
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Engine speed (idling speed)
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750...860 rpm
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internally calculated value).
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 conditioning compressor
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Display group 51 -RPM- Gear shift intervention
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▪ Engine running at idling speed
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Read measured value block 51
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⇒
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◂ Indicated on display
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xxxx rpm
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xxxx rpm
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x
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xx.x 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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Engine control unit voltage supply
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11.5...14.5 V
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Driving range (automatic only)
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0...6
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---
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Engine speed (specified idling speed):
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820 rpm
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---
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Engine speed (idling speed)
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750...860 rpm
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=> Page 01-102
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internally calculated value).
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Display group 54 -Speed regulation-
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▪ Whilst driving
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Read measured value block 54
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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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xxx %
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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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◂ Display zones
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Specification
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Evaluation
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Throttle valve angle (potentiometer 1 -G187)
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0...100 %
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---
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Accelerator pedal position sender 1 -G79
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0...100%
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---
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Operating mode (idling, part load, enrichment, overrun)
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---
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---
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Engine speed
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750...6500 rpm
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---
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Display group 55 -Speed regulation- Idling stabilisation
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▪ Engine running at idling speed
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Read measured value block 55
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.xx %
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xx.xx %
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xxxxx
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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 condition
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xxxxx
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=> Page 01-135
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Idling stabilisation learning value
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-10...10 %
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---
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Idling speed regulator
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-10...10 %
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---
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Engine speed (idling speed)
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750...860 rpm
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=> Page 01-102
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Note on display zone 3:
Displayed is the amount that the idling speed stabilisation has moved away from the prescribed average. For a new engine the values lie in the positive range, because of the higher friction and in the negative range with an engine that has run-in.
Significance of figures in 5-digit number block, display zone 4 - operating modes
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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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Significance
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1
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Air conditioner compressor switched on
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1
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Driving range (gear) selected
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1
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Air conditioning system switched on
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x
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Not relevant
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x
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Not relevant
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Display group 56 -Speed regulation- Idling speed stabilisation
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▪ Engine running at idling speed
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Read measured value block 56
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⇒
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◂ Indicated on display
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xxxx rpm
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xxxx rpm
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xx.x %
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xxxxx
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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
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xxxxx
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=> Page 01-135
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Idling speed regulator
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-10...10 %
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---
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Engine speed (specified idling speed):
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820 rpm
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---
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Engine speed (idling speed)
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750...860 rpm
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=> Page 01-102
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internally calculated value).
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Display group 60 -Speed regulation- Adaption EPC system 1)
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▪ Ignition on, engine not running
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▪ Control unit in mode 04 basic setting
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Read measured value block 60
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⇒
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◂ Indicated on display
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xx %
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xx %
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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
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Evaluation
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Adaption condition (ADP runs, ADP OK or ADP ERROR)
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ADP OK
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---
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Learning step counter
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0...8
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---
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Throttle valve angle (potentiometer 2 -G188)
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97...3 %
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---
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Throttle valve angle (potentiometer 1 -G187)
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3...97 %
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1) Adapt engine control unit to throttle valve control part and exhaust gas recirculation valve => Page 24-111.
Note on display group 60:
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◆ The throttle valve control unit potentiometers are opposed. The value from both potentiometers must always add up to approx. 100 %.
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◆ Matching the throttle valve control part is performed with ignition switched on.
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◆ Engine control unit is adapted to throttle valve control unit when selecting display group 60 under function 04 "Basic setting". This adaption 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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◆ The specifications indicated in display zones 1 and 2 do not fully reach the max. min. figures.
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◆ During adaption, the counter in display zone 3 counts up to 8.
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Display group 61 -Speed regulation- Electronic accelerator system
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▪ Whilst driving
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Read measured value block 61
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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 %
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xxxxx
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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
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xxxxx
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=> Page 01-135
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Throttle valve drive -G186 activation
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0...100 %
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---
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Voltage supply for engine control unit
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11.5...14.5 V
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=> Page 01-107
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Engine speed
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750...6500 rpm
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---
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Display group 62 -Speed regulation- Electronic accelerator system
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▪ Ignition on, engine not running
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Read measured value block 62
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⇒
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◂ Indicated on display
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xx %
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xx %
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xx %
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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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Accelerator pedal position sender 2 (G185)
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3.0...48.0 %
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---
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Accelerator pedal position sender 1 (G79)
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6.0...96.0 %
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---
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Throttle valve angle (potentiometer 2 -G188)
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97...3 %
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---
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Throttle valve angle (potentiometer 1 -G187)
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3...97 %
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Notes on display group 62:
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◆ The potentiometer for the throttle valve control part and the accelerator pedal sender are featured in pairs for reasons of safety. The engine control unit constantly checks the plausibility of the potentiometers.
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◆ The throttle valve control unit potentiometers are opposed. The value from both potentiometers must always add up to approx. 100 %.
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◆ The value from accelerator pedal position 2 (G185) has to display half the value of sender 1 at all times.
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◆ The specifications do not fully reach the max. min. figures.
Vehicles with automatic gearboxes
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Display group 63 -Speed regulation- Kick down adaption
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▪ Ignition on, engine not running
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▪ Control unit in mode 04 basic setting
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▪ Accelerator pedal fully depressed
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Read measured value block 63
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⇒
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◂ Indicated on display
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xx %
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xx %
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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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Operating mode (ERROR, actuate, ADP. runs, ADP. OK
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ADP. OK
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---
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Kick-down switch
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Kick-down
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---
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Accelerator pedal position sender 2 -G185
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---
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---
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Accelerator pedal position sender 1 -G79
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---
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---
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Vehicles with cruise control system (CCS)
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Display group 66 -Cruise control system
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▪ Engine running at idling speed
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▪ CCS operating switch locked in OFF
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Read measured value block 66
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⇒
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◂ Indicated on display
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km/h
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xxxx
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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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◂ Display zones
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Specification
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Evaluation
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Switch position of CCS controls switch
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0000
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=> Page 01-142
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Specified road speed (last value stored by CCS)
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---
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---
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Brakes, clutch and CCS switches position
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1000
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=> Page 01-142
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Road speed (actual)
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0 km/h
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---
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Significance of the figures in the 4 digit display, display zone 2, brakes, clutch and CCS switches position
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1
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1
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1
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1
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Significance
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Brake depressed (brake light switch)
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Brake depressed (brake pedal switch)
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Clutch depressed or, on automatic gearbox, always 0
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Cruise control system operational
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Note on 4 digit display:
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◆ Checking clutch pedal switch => Page 24-126
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◆ Checking brake light and brake pedal switch => Page 24-129
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◆ Set cruise control system to operational with log-in code 11463; deactivate with log-in code 16167.
Significance of the figures in the 4 digit display, display zone 4, CCS control switches
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1
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1
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0
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0
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Significance
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CCS sliding switch at off (switch locked only)
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CCS sliding switch at off (switch not locked or locked)
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SET button depressed
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CCS sliding switch at RES
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Checking control switches for cruise control system:
=> Electrical system; Repair group 27
Function of cruise control system:
=> Owner's Manual in vehicle
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