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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 condition
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On or off
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---
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Engine speed (idling speed specification)
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HS approx. 670...760 rpm
AT approx. 800...860 rpm
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---
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Engine speed (idling speed)
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640...900 rpm
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internal, temperature dependent calculated value).
HS = Manual gearbox; AT = Automatic gearbox
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
Engine code AVU
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Display group 53 -Speed regulation- Increase in idling speed due to load on alternator
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▪ Engine running at idling speed
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Read measured value block 53
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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.xx V
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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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Load on alternator
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0...100 %
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---
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Voltage
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11.5...15.0 V
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---
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Engine speed (idling speed specification)
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HS approx. 670...760 rpm
AT approx. 800...860 rpm
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---
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Engine speed (actual value)
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640...900 rpm
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=> Page 01-113
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internal, temperature dependent calculated value). HS = Manual gearbox; AT = Automatic gearbox
Note on display zone 3:
If the supply voltage for the engine control unit drops below 10.5...9 Volt, the idling speed is raised in stages to 860 rpm.
Notes on display zone 4:
The displayed value depends on the electrical consumers switched on at the time, i.e. rear window heater, blower, seat heating etc.
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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, full load)
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---
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---
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Engine speed
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640...6500 rpm
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=> Page 01-113
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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 01-155
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Idling stabilisation learning value
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-10...10 %
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---
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Idling regulator
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-10...10 %
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---
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Engine speed (idling speed)
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640...900 rpm
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=> Page 01-113
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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 5 digit number block
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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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1
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Power assisted steering pressure switch on
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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 %
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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 01-155
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Idling speed regulator
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-10...20 %
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---
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Engine speed (idling speed specification)
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HS approx. 670...760 rpm
AT approx. 800...860 rpm
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---
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Engine speed (idling speed)
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640...900 rpm
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=> Page 01-113
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Note on display zone 2:
The specified engine speed from the engine control unit is displayed (control unit internal, temperature dependent calculated value).
HS = Manual gearbox; AT = Automatic gearbox
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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...9
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---
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Throttle valve angle (potentiometer 2 -G188)
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100...0 %
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---
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Throttle valve angle (potentiometer 1 -G187)
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0...100 %
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---
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1)
Erase learnt values and adapt engine control unit to throttle valve control part and exhaust gas recirculation valve => Page 24-128
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Note on display group 60:
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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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◆ The counter counts up to 9 in display zone 3 during the adaption.
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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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---
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Notes on display group 62:
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◆ The potentiometers 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 value from accelerator pedal position 2 (G185) has to display half the value of sender 1 at all times.
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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 specifications do not fully reach the max. min. figures.
Engine code AVU
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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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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 modes (ERROR, actuate, ADP. runs, ADP. OK)
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ADP. OK
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=> Page 24-135
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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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Note on display zone 2:
If "actuate" appears in the display, depress the accelerator pedal fully and hold it in this position. The test is complete once "ADP. OK" appears in the display.
Vehicles with cruise control system (CCS)
Engine code APF
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Display group 66 -Cruise control system
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▪ Engine running at idling speed
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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 01-161
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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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x000
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=> Page 01-161
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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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x
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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 1
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Cruise control system operational
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◆ Checking clutch pedal switch signal => Page 24-152
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◆ Checking brake light and brake pedal switch signal => Page 24-154
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
Vehicles with cruise control system (CCS)
Engine code AVU
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Display group 66 -Cruise control system
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▪ Engine running at idling speed
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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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xxxxxxxx
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km/h
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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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Switch position of CCS control switch
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xxxxxxxx
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=> Page 01-164
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Specified road speed (last value stored by CCS)
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---
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---
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Switch position of brake, clutch and CCS
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xxxx1xxx
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=> Page 01-163
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Road speed (actual)
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0 km/h
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---
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Significance of figures in 8-digit display, display zone 2, switch for brake, clutch and CCS.
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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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Brake pedal depressed (brake light switch)
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1
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Brake pedal depressed (brake pedal switch)
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1
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Clutch pedal depressed or always 1 for automatic gearbox
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1
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Cruise control system has been authorized
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0
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Vacant
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0
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Vacant
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0
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Vacant
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0
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Vacant
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Notes:
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◆ Checking clutch pedal switch signal => Page 24-152
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◆ Checking brake light and brake pedal switch signal => Page 24-154
Significance of figures in 8-digit display, display zone 4, control switch for CCS
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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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0
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CCS slide switch at OFF (only when in detent)
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0
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CCS slide switch at OFF (not in detent or in detent) or when multi-function steering wheel OFF button is depressed
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1
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SET button depressed
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1
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CCS slide switch at RES or when multi-function steering wheel RES button is depressed
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0
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Vacant
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0
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Vacant
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0
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Vacant
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0
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Vacant
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Notes:
Checking control switches for cruise control system:
=> Electrical system; Repair group 27
Checking multi-function steering wheel:
=> Radio, Telephone, Navigation Self-diagnosis; Repair group 01
Function of cruise control system:
=> Owner's Manual in vehicle
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