|
Evaluating measured value blocks, display groups 0...9 -Basic functions-
Evaluating measured value blocks, display groups 0...9 -Basic functions-
|
Display group 1 -Basic functions-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 1
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xxx.x °C
|
xx.x %
|
xxxxxxxx
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Adjustment conditions for basic setting
|
1x111111
|
|
|
|
|
|
Lambda regulator before catalyst
|
-15.0...15.0 %
|
=> Page 01-119
|
|
|
|
Coolant temperature
|
80.0...110.0 °C
|
=> Page 01-93
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
Evaluating display group 1, display zone 1 - Engine speed (idling speed)
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than
specification
|
- Throttle valve control part sticking or defective
|
- Check throttle valve control part
=> Page 24-42
|
|
|
|
- Perform idling check => Page 24-91
|
|
More than specification
|
- Idling not recognised
|
- Interrogate fault memory, => Page 01-20
, Interrogating and erasing fault memory
|
|
|
- Large amount of unmetered air (cannot be compensated for by the idling stabilisation)
|
- Check intake air system for leaks
=> Page 24-88
|
|
|
- Throttle valve control part sticking/defective
|
- Check throttle valve control part
=> Page 24-42
|
|
|
|
- Perform idling check => Page 24-91
|
Significance of figures in 8-digit number block, display zone 4 - adjustment conditions
|
Significance when display = 1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
Significance
|
|
|
|
|
|
|
|
|
1
|
Coolant temperature above 80 °C
|
|
|
|
|
|
|
|
1
|
|
Speed below 2000 rpm
|
|
|
|
|
|
|
1
|
|
|
Throttle valve closed
|
|
|
|
|
|
1
|
|
|
|
Lambda regulation OK.
|
|
|
|
|
1
|
|
|
|
|
Idling recognised
|
|
|
|
1
|
|
|
|
|
|
Air conditioner compressor switched off
|
|
|
1
|
|
|
|
|
|
|
Catalyst hot (over 300 °C)
|
|
1
|
|
|
|
|
|
|
|
No faults recognised by self-diagnosis
|
|
Display group 2 -Basic functions-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 2
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xxx.x %
|
x.x ms
|
xxx mbar
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Intake manifold pressure
|
250...500 mbar
|
=> Page 01-89
|
|
|
|
|
Injection period
|
1.0...3.0 ms
|
=> Page 01-89
|
|
|
|
Engine load
|
12.0...30.0 %
|
=> Page 01-98
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
Evaluating display group 2, display zone 3 - Injection period
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than specification
|
- Large amount of fuel from the activated charcoal filter system
|
- Check activated charcoal filter solenoid valve 1 => Page 01-60
, Final control diagnosis
|
|
Larger than specification
|
- Increased engine load due to electrical consumers, air conditioner, gear selected or P.A.S. on full lock
|
- Eliminate increased load (air conditioner, power assisted steering etc.)
|
Evaluating display group 2, display zone 4 - Intake manifold pressure
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than specification
|
- Intake manifold pressure sender (G71) defective
|
- Check intake manifold pressure sender
|
|
Larger than specification
|
- Increased engine load due to electrical consumers, air conditioner, gear selected or P.A.S. on full lock
|
- Eliminate increased load (air conditioner, power assisted steering etc.)
|
|
|
- Intake manifold pressure sender (G71) defective
|
- Check intake manifold pressure sender
|
|
Display group 3 -Basic functions-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 3
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xxx mbar
|
xx.x %
|
xx.x°BTDC
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Ignition angle
|
-5.0...10.0 ° BTDC
|
---
|
|
|
|
|
Throttle valve angle
Throttle valve drive angle sender (G187)
|
0.8...4.5 %
|
=> Page 01-99
|
|
|
|
Intake manifold pressure
|
250...500 mbar
|
=> Page 01-89
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
|
Display group 4 -Basic functions-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 4
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xx.x V
|
xxx.x °C
|
xxx.x °C
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Intake air temperature
|
-48.0...142.5 °C
|
=> Page 01-94
|
|
|
|
|
Coolant temperature
|
80.0...110.0 °C
|
=> Page 01-93
|
|
|
|
Engine control unit voltage supply
|
11.5...15.0 V
|
=> Page 01-92
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
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 (below or above 20 °C).
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
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than specification
|
- Alternator defective, battery heavily discharged
|
- Check alternator and battery voltage, charge battery:
|
|
|
- Battery heavily loaded shortly after starting due to high charging current and current consumers
|
- Increase revs slightly for a few minutes and switch off current consumers
|
|
|
- Transfer resistance in the current supply or the engine control unit earth connection
|
- Check engine control unit voltage supply => Page 24-117
|
|
|
- Current draw when ignition is off
|
- Eliminate current draw
|
|
More than specification
|
- Voltage regulator on alternator defective
|
- Check voltage, replace regulator if necessary:
|
|
|
- Excess voltage due to jump starting or quick charging unit
|
- Interrogate fault memory => Page 01-20
, Interrogating and erasing fault memory
|
Evaluating display group 4, display zone 3 - Coolant temperature
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than specification
|
- Engine too cold
|
- If necessary carry out test drive
|
|
|
- Coolant temperature sender or wiring to engine control unit
|
- Check coolant temperature sender
|
|
More than specification
|
- Radiator soiled
|
- Clean radiator
|
|
|
- Radiator fan not functioning
|
- Check function
=> Current flow diagrams, Electrical fault finding and Fitting locations
|
|
|
- Thermostat sticking/defective
|
- Check thermostat:
|
|
|
- Coolant temperature sender or wiring to engine control unit
|
- Check coolant temperature sender
|
|
Constant 30.0 or
49.5 °C
|
- Wiring open/short circuit
|
- Check coolant temperature sender
|
Evaluating display group 4, display zone 4 - Intake air temperature
|
Appears on display
|
Possible fault cause
|
Fault elimination
|
|
Less than or greater than specification
|
- Intake air temperature sender (G42) defective
|
- Check intake air temperature sender
|
|
Constant 9.0 or
30.0 °C
|
|
|
|
Display group 5 -Basic functions-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 5
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xxx.x %
|
xxx km/h
|
Text
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Operating mode:
Idling, part throttle, enrichment, overrun, full throttle
|
Idling
|
---
|
|
|
|
|
Road speed
|
0 km/h
|
---
|
|
|
|
Engine load
|
12.0...30.0 %
|
=> Page 01-98
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
|
Display group 6 -Basic function-
|
|
▪ Engine running at idling speed
|
|
Read measured value block 6
|
⇒
|
◂ Indicated on display
|
|
|
|
xxxx rpm
|
xxx.x %
|
xxx.x °C
|
xx.x %
|
|
|
|
|
1
|
2
|
3
|
4
|
◂ Display zones
|
Specification
|
Evaluation
|
|
|
|
|
|
Elevation correction factor
|
-50.0...20.0 %
|
---
|
|
|
|
|
Intake air temperature
|
-48.0...142.5 °C
|
=> Page 01-94
|
|
|
|
Engine load
|
12.0...30.0 %
|
=> Page 01-98
|
|
|
Engine speed (idling speed)
|
800...900 rpm
|
=> Page 01-86
|
Note on display zone 3:
The total temperature range is given as the specification. The displayed value must be above ambient temperature.
|
