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Evaluating measured value blocks, display groups 0...6 -Basic functions-
Evaluating measured value blocks, display groups 0...6 -Basic functions-
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Display group 1 -Basic functions-
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Read measured value block 1
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◂ Indicated on display
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xxxx rpm
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xx.x °C
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xx.x %
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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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Adjustment conditions
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10111111
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Lambda regulation values
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-15...15 %
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=> Page 01-114
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Coolant temperature
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75...85 °C
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=> Page 01-101
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
Significance of 8-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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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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Coolant temperature above 80 °C
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1
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Speed below 2000 rpm
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1
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Throttle valve closed
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1
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Lambda regulation OK.
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1
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Idling switch closed
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1
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Air conditioner compressor switched off
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1
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Catalytic converter hot (over 300 °C)
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1
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No faults recognised by self-diagnosis
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Evaluating display group 1, display zone 1 - Engine speed (idling speed)
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Appears on display
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Possible fault cause
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Fault elimination
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Less than specification
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- Throttle valve control part sticking or defective
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- Check throttle valve control part
=> Page 24-49
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- Air filter element obstructed by dirt
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- Renew air filter element
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Greater than
specification
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- Throttle valve control part sticking or defective
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- Interrogate fault memory, => Page 01-19
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- Large amount of unmetered air (cannot be compensated for by the idling stabilisation)
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- Check intake air system for leaks
=> Page 24-93
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- Check throttle valve control part
=> Page 24-49
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- Perform idling check => Page 24-96
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Evaluating display group 1, display zone 2 - Coolant temperature
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 80 °C
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- Engine too cold
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- If necessary carry out test drive
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- Coolant temperature sender or wiring to engine control unit
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- Check coolant temperature sender
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- Thermostat defective
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- Check thermostat
=> Repair group 19; Removing and installing parts of cooling system; Parts of cooling system engine side
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More than 110 °C
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- Radiator soiled
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- Clean radiator
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- Radiator fan not functioning
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- Check function
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- Thermostat defective
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- Check thermostat
=> Repair group 19; Removing and installing parts of cooling system; Parts of cooling system
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- Coolant temperature sender or wiring to engine control unit
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- Check coolant temperature sender
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Display group 2 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 2
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx.x %
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x.x ms
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xxx mbar
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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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Intake manifold pressure
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290...360 mbar
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=> Page 01-104
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Injection period
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2.0...4.0 ms
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=> Page 01-103
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Engine load
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12...18 %
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=> Page 01-113
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
Evaluating display group 2, display zone 3 - Injection period
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 2.0 ms
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- Large amount of fuel from the activated charcoal filter system
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- Check activated charcoal filter solenoid valve 1 => Page 01-72, Final control diagnosis
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- Incorrect injectors with greater throughput installed
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- Check injectors => Page 24-78
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- Check injector part number:
=> Parts micro-fiche
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More than 4.0 ms
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- Increased engine load due to electric consumers, air conditioner, gear selected or P.A.S. on full lock
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- Eliminate increased load (air conditioner, power assisted steering etc.)
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- Incorrect injectors with smaller throughput installed
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- Check injectors => Page 24-78
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- Check injector part number:
=> Parts micro-fiche
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Evaluating display group 2, display zone 4 - Intake manifold pressure
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 290 mbar
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- Large amount of unmetered air (air leak) between intake manifold and air cleaner
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- Rectify air leak
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More than 360 mbar
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- Gear selected (automatic gearbox)
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- Place selector lever in P or N
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- Engine loaded due to ancillaries
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- Eliminate load (air conditioner, power-assisted steering etc.)
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- Air filter element obstructed by dirt
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- Renew air filter element
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Display group 3 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 3
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx mbar
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xx°
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xx.x°BTDC
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1
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2
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3
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4
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◂ Display zones
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Specification
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Evaluation
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Ignition timing
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0...8 ° BTDC
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---
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Throttle valve angle (potentiometer 1 -G187)
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1...5 °
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=> Page 01-114
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Intake manifold pressure
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290...360 mbar
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=> Page 01-104
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
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Display group 4 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 4
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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.x °C
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xxx.x °C
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1
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2
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3
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4
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◂ Display zones
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Specification
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Evaluation
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Intake air temperature
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-10...50 °C
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=> Page 01-109
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Coolant temperature
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75...85 °C
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=> Page 01-108
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Voltage supply for engine control unit
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12.5...14.5 V
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=> Page 01-107
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
Note on display zone 3:
The engine control unit will use the intake air temperature as a replacement value for an engine start (start temperature - replacement value) as soon as there is a fault stored in the fault memory, which affects the coolant temperature sender (G62). The temperature then rises according to a model stored in the control unit. When the engine has reached normal working temperature a fixed replacement value will be displayed after a certain period. This fixed value is also dependent upon the intake air temperature.
Note on display zone 4:
The total temperature range is given as the specification. The displayed value must be above ambient temperature.
Evaluating display group 4, display zone 2 - Control unit voltage supply
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 12.500 V
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- Alternator defective, battery heavily discharged
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- Check alternator and battery voltage, charge battery:
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- Heavy battery load shortly after starting due to high charging current and current consumers
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=> Increase revs slightly for a few minutes and switch off current consumers
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- Transfer resistance in the current supply or the engine control unit earth connection
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- Check engine control unit voltage supply => Page 24-121
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- Current draw when ignition is off
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- Eliminate current draw
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More than 14.500 V
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- Voltage regulator on alternator defective
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- Check voltage regulator, replace if necessary:
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- Excess voltage due to jump starting or quick charging unit
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- Interrogate fault memory => Page 01-19
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Evaluating display group 4, display zone 3 - Coolant temperature
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Appears on display
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Possible fault cause
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Fault elimination
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Less than 75 °C
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- Engine too cold
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- If necessary carry out test drive
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- Coolant temperature sender or wiring to engine control unit
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- Check coolant temperature sender
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- Thermostat defective
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- Check thermostat
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Higher than 110 °C
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- Dirt on radiator
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- Clean radiator
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- Radiator fan not working
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- Check function
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- Thermostat defective
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- Check thermostat
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- Coolant temperature sender or wiring to engine control unit
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- Check coolant temperature sender
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Constant -40.0 °C
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- Wiring open circuit or short to positive
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- Check coolant temperature sender
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Constant 120.0 °C
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- Short to earth
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Evaluating display group 4, display zone 4 - Intake air temperature
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Appears on display
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Possible fault cause
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Fault elimination
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Constant -40.0 °C
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- Wiring open circuit or short to positive
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- Check intake air temperature sender
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Constant 120.0 °C
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- Short to earth
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Display group 5 -Basic functions-
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▪ Engine running at idling speed
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Read measured value block 5
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx.x %
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xxx km/h
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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 (idling, part throttle, enrichment, overrun)
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Idling
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---
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Road speed
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0 km/h
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---
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Engine load
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12...18 %
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=> Page 01-113
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
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Display group 6 -Basic function-
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▪ Engine running at idling speed
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Read measured value block 6
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx.x %
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xxx.x °C
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xx.x %
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1
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2
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3
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4
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◂ Display zones
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Specification
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Evaluation
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Elevation correction factor
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-30.0...5.0 %
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---
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Intake air temperature
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-40...120.0 °C
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=> Page 01-109
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Engine load
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12...18 %
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=> Page 01-113
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Engine speed (idling speed)
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630...830 rpm1)
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=> Page 01-100
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1) Up-to-date specifications:
=> Exhaust emissions test binder
Note on display zone 3:
The total temperature range is given as the specification. The displayed value must be above ambient temperature.
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