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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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[ltrif ] 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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[ltrif ] 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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860 rpm
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---
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Engine speed (idling speed)Four wheel driveFront wheel drive
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620...740 rpm
710...680 rpm
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Note on display zone 2:
The specified engine speed from engine control unit (calculated in control unit) is displayed. In exceptional cases the idling speed can be adapted => Page . The idling speed figures with gear selected are then automatically modified.
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 =>Page
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Display group 54 -Idling control-
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▪ Whilst driving
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Read measured value block 54
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⇒
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[ltrif ] 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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[ltrif ] 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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620...2520 rpm
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Note on display zone 1:
Tester shuts down above 2520 rpm.
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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[ltrif ] 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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[ltrif ] 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 01-102
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Idling regulator learning value
Air conditioner on (A/C High)
Air conditioner off (A/C Low)
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-6.0...6.0 %
-3.0...3.0 %
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---
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Idling regulator
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-4.30...12.20 %
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---
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Engine speed (idling speed)Four wheel driveFront wheel drive
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620...740 rpm
710...680 rpm
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=> Page 01-57
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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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1
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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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[ltrif ] 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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[ltrif ] 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 01-102
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Idling regulator
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-4.30...12.20 %
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---
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Engine speed (idling speed specification):
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860 rpm
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---
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Engine speed (idling speed)Four wheel driveFront wheel drive
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620...740 rpm
710...680 rpm
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=> Page 01-57
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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 -Idling regulation- 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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[ltrif ] 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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[ltrif ] 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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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 24-109
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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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◆ If the voltage supply is interrupted (battery disconnected) the adaption (matching) must be carried out again => Page 24-119
Procedure after voltage supply open circuit.
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◆ The counter counts up to 9 in display zone 3 during the adaption.
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Display group 61 -Idling 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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[ltrif ] Indicated on display
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xxxx/min
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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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[ltrif ] 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 01-102
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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 01-65
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Engine speed
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630...6800 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 -Idling 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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[ltrif ] 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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[ltrif ] 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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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 %).
Vehicles with automatic gearboxes
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Display group 63 -Speed control- 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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[ltrif ] 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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[ltrif ] Display zones
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Specification
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Evaluation
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Operating mode (ERROR, depress, ADP running, ADP O.K.
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ADP O.K.
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---
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Gas pedal position
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Kick down
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---
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Throttle valve angle (potentiometer 2 -G188)
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94...4 %
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---
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Throttle valve angle (potentiometer 1 -G187)
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12...97 %
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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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Read measured value block 66
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⇒
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[ltrif ] 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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[ltrif ] 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 01-109
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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 01-109
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Road speed (actual)
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0 km/h
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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 brake depressed
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Cruise control system operational
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◆ Checking clutch pedal switch => Page
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◆ Checking brake light and brake pedal switch => Page
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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1
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1
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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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