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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- Operating condition
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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 (idling speed specification):
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700 rpm
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---
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Engine speed (idling speed)
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650...750 rpm
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Note on display zone 3 and 4:
A/C-High = Air conditioner demands high heating or cooling performance. A/C-Low = Air conditioner not turned on.
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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 54 -Speedregulation-
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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, partial load, enrichment, overrun, full load)
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---
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---
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Engine speed
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650...2520 rpm
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---
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Note on display zone 2:
The operating mode is displayed according to engine speed or load. At a higher engine speed, "overrun" is displayed when throttle valve is closed only up to 1450 rpm, and then again at idle.
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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/min
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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 mode
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xxxxx
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=> Page 01-160
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Idling regulator learnt value
Air conditioning on (A/C High)
Air conditioning off (A/C Low)
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-5.0...5.0 %
-5.0...5.0 %
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---
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Idling regulator
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-5.0...10.0 %
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---
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note on display zone 3:
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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X
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Not relevant
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1
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Not relevant
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X
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Not relevant
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1
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Driving range (gear) selected
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1
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Air conditioner compressor switched on
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1) Not displayed in 4-digit number block
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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/min
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xxxx/min
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x.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 01-160
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Idling regulation
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-5.0...10.0 %
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---
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Engine speed (idling speed specification):
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700 rpm
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---
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Engine speed (idling speed)
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650...750 rpm
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=> Page 01-125
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Note:
The rpm in display zone 1 (measured rpm) is the actual engine speed.
The rpm in display zone 2 (specified rpm) is a theoretical engine speed calculated by the engine control unit.
At idle, the engine control unit always tries to adapt the actual engine speed to the specified engine speed.
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Display group 60 -Speedregulation- Adaption of electronic accelerator system
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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...93 %
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1) Adapting engine control unit to throttle valve control part => Page 24-153.
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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◆ If the voltage supply is interrupted (battery disconnected) the adaption (matching) must be carried out again => Page 24-146 Procedure after voltage supply open circuit.
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◆ During adaption, the counter counts from 0 to 8 in display zone 3 .
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Display group 61 -Speedregulation- 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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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 01-160
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Throttle valve angle (potentiometer 1 -G187)
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0...100 %
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---
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Supply voltage for engine control unit
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12.0...15.0 V
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=> Page 01-130
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Engine speed
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650...6500 rpm
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---
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Note:
The engine control unit calculates the angle sender voltage value as a percent of 5 Volts and displays this percentage. (5-Volt supply voltage equals 100 %).
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Display group 62 -Speedregulation- 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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4...49 %
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---
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Accelerator pedal position sender 1 -G79
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12...97 %
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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...93 %
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---
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Note:
The engine control unit calculates the potentiometer voltage value as a percent of 5 Volts and displays this percentage. (5-Volt supply voltage equals 100 %).
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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 1 -G79 (learnt kickdown)
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80...100 %
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---
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Accelerator pedal position sender 1 -G79
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70...97 %
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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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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 control switch
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00000011
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=> Page 01-167
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Specified road speed (last value stored by CCS)
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---
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---
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Brake and CCS switch positions
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00001000
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=> Page 01-167
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Road speed (actual)
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0 km/h
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Significance of the figures in the 8-digit display, display zone 2, brake and CCS switches
Note:
Only the last four digits of the 8-digit display are described in the following table.
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1
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0
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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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Constant 0 for vehicles with automatic gearbox
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Cruise control system operational
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◆ Check brake light and brake pedal switches => Page 24-173
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◆ Set cruise control system to operational with log-in code 11463; deactivate with log-in code 16167.
=> Electrical system; Repair group 27
Significance of the figures in the 8-digit display, display zone 4, CCS control switches
Note:
Only the last four digits of the 8-digit display are described in the following table.
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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 (locked only; not locked = 1)
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CCS sliding switch at off (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
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