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Evaluating measured value blocks, display groups 10...29 -Ignition-
Evaluating measured value blocks, display groups 10...29 -Ignition-
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Display group 10 -Ignition-
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▪ Engine running at idling speed
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Read measured value block 10
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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 %
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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...10 ° BTDC
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---
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Throttle valve angle (potentiometer 1 -G187)
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0...11 %
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Engine load
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10...20 %
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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 10, display zone 2 - Engine load
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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 10 %
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- Lesser values can only occur when driving in overrun
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Greater than 20 %
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- Poor idling (not running on all cylinders)
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- Check injectors => Page 28-1
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- Electric consumers switched on
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- Switch off electric consumers
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- Steering wheel is being turned
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- Do not turn steering wheel
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- Gear selected (automatic gearbox)
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- Place selector lever in P or N
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Evaluating display group 10, display zone 3 - Throttle valve angle
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Appears on display
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Possible fault cause
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Fault elimination
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More than 11 %
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- Engine control unit not adapted to throttle valve control part
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- Adapt engine control unit to throttle valve control part => Page 24-133
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- Throttle valve potentiometer in throttle valve control part defective
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- Check throttle valve control part
=> Page 24-49
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- Throttle valve sticking
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- Eliminate cause
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- Dirt in air filter element
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- Renew air filter element
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Display group 11 -Ignition-
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▪ Engine running at idling speed
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Read measured value block 11
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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 %
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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...10 ° BTDC
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---
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Intake air temperature
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-
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-
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Coolant temperature
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-
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-
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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 group14 -Ignition- Misfire recognition total
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▪ Whilst driving
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Read measured value block 14
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.x %
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xxx
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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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Misfire recognition
(activated, blocked)
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activated
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---
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Misfire count (total)1)
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0
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=> Page 01-117
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Engine load
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12.0...100.0 %
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---
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Engine speed
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630...5700 rpm
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---
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1) When the engine is idling, the misfire count is returned to zero if no misfires are detected for approx. 3 minutes.
Evaluating display group 14, display zone 3 - Total number of misfires
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Appears on display
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Possible fault cause
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Fault elimination
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More than 0
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- Spark plug defective
- Spark plug connector defective
- Ignition transformer defective
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- Check spark plugs and ignition/HT wiring with connector => Page 28-12
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- Injector defective
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- Check injectors
=> Page 24-78
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- Exhaust gas recirculation valve dirty or sticking
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- Check exhaust gas recirculation valve => Page 01-72, Final control diagnosis
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Display group 15 -Ignition- Misfire recognition Cyl. 1 to Cyl. 3
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▪ Whilst driving
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Read measured value block 15
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◂ Indicated on display
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xxx
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xxx
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xxx
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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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Misfire recognition
(activated, blocked)
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activated
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---
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Misfire Cyl. 31)
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0
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=> Page 01-120
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Misfire Cyl. 21)
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0
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=> Page 01-120
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Misfire Cyl. 11)
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0
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=> Page 01-120
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1) When the engine is idling, the misfire count is returned to zero if no misfires are detected for approx. 3 minutes.
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Display group 16 -Ignition- misfire recognition Cyl. 4
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▪ Whilst driving
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Read measured value block 16
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◂ Indicated on display
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xxx
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---
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---
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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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Misfire recognition
(activated, blocked)
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activated
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---
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Misfire Cyl. 41)
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0
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=> Page 01-120
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1) When the engine is idling, the misfire count is returned to zero if no misfires are detected for approx. 3 minutes.
Evaluating display group 15 display zones 1 to 3 or display group 16 display zone 1 - Misfire recognition Cyl. 1 to Cyl. 4
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Appears on display
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Possible fault cause
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Fault elimination
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More than 0
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- Spark plug defective
- Spark plug connector defective
- Ignition transformer defective
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- Check spark plugs and ignition/HT wiring with connector => Page 28-12
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- Injector defective
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- Check injectors
=> Page 24-78
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- Exhaust gas recirculation valve dirty or sticking
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- Check exhaust gas recirculation valve => Page 01-72, Final control diagnosis
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Display group 22 -Ignition- Knock control
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▪ Whilst driving
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Read measured value block 22
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⇒
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◂ Indicated on display
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xxxx rpm
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x.xx %
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xx.x °CA
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xx.x °CA
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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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Cyl. No. 2 retardation of ignition timing by knock control
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0...14 °CA
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=> Page 01-123
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Cyl. No. 1 retardation of ignition timing by knock control
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0...14 °CA
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=> Page 01-123
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Engine load
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15...100 %
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---
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Engine speed
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630...5700 rpm
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---
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Note on display zones 3 and 4:
The display value should be 0.0 °CA at idling speed.
14°is the maximum possible retardation
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Display group 23 -Ignition- Knock control
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▪ Whilst driving
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Read measured value block 23
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⇒
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◂ Indicated on display
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xxxx rpm
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x.xx %
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xx.x °CA
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xx.x °CA
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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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Cyl. No. 4 retardation of ignition timing by knock control
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0...14 °CA
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=> Page 01-123
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Cyl. No. 3 retardation of ignition timing by knock control
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0...14 °CA
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=> Page 01-123
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Engine load
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15...100 %
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---
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Engine speed
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630...5700 rpm
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Note on display zones 3 and 4:
The display value should be 0.0 °CA at idling speed.
14°is the maximum possible retardation
Evaluating display groups 22/23, display zones 3 and 4 - Retardation of ignition
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Appears on display
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Possible fault cause
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Fault elimination
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All cylinders 14 °CA
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- Knock sensor defective
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- Check knock sensors => Page 28-18
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- Connector corroded
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- Knock sensor incorrectly tightened
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- Loosen knock sensor and tighten to 20 Nm
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- Ancillary components on engine loose
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- Tighten ancillary components
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- Poor fuel quality
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- Change type of fuel
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One cylinder deviates greatly from the others
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- Connector corroded
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- Check knock sensors => Page 28-18
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- Mechanical engine damage
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- Check compression pressures:
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- Ancillary components on engine loose
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- Tighten ancillary components
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Display group 28 -Ignition- knock control
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▪ Whilst driving
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Read measured value block 28
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.x %
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xxx.x °C
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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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Knock sensor test result
(Test On / Test OFF / Sys. OK. / Sys. n.OK.
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Sys. OK.
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---
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Coolant temperature
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60...110 °C
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=> Page 01-108
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Engine load
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50...70 %
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---
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Engine speed
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2000...4000 rpm
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---
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