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Evaluating measured value blocks, display groups 70...79 -Reducing emissions-
Evaluating measured value blocks, display groups 70...79 -Reducing emissions-
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Display group 70 -Reducing emissions- Activated charcoal filter system diagnosis (tank breathing system)
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▪ Engine running at idling speed
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▪ Coolant temperature at least 40 °C
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▪ Control unit in mode 04-Basic settings
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Read measured value block 70
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⇒
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◂ Indicated on display
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xxx %
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xx.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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Result of diagnosis (Test ON / OFF or TBV OK / n.OK)
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TBV OK
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Lambda regulation deviation in TVV diagnosis
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-7...7 %
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Activated charcoal filter system solenoid valve 1 duty cycle
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0...80 %
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Note:
TBV means fuel tank breathing valve (activated charcoal filter system solenoid valve 1). The diagnosis can only be initiated once per engine start.
Notes on display zone 2:
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◆ Lambda regulator deviation in negative range: Activated charcoal filter full
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◆ Lambda regulator deviation in positive range: Activated charcoal filter empty
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Display group 74 -Reducing emissions- Adapting exhaust gas recirculation system 1)
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▪ Ignition on, engine not running
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▪ Control unit in mode 04-Basic settings
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Read measured value block 74
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◂ Indicated on display
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x.xxx V
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x.xxx V
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x.xxx V
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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, ADP. runs, ADP. OK
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ADP. OK
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Exhaust gas reduction potentiometer
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0.000...5.000 V
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---
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Learnt value upper limit
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0.000...5.000 V
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---
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Learnt value lower limit
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0.000...5.000 V
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1) Adapt engine control unit to exhaust gas recirculation valve .
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Display group 77 -Reducing emissions- Secondary air system diagnosis
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▪ Engine running at idling speed
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▪ Lambda probe before catalyst diagnosis OK (=> display group 34)
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▪ Intake air temperature maximum 5...75 °C
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▪ Coolant temperature at least 60 °C
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▪ Control unit in mode 04-Basic settings
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Read measured value block 77
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⇒
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◂ Indicated on display
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xxxx rpm
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xx.x g/s
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x.x g/s
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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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Result of diagnosis (Test ON/ OFF, Syst. OK / n.OK)
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Syst. OK
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Secondary air system air mass
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Air mass drawn in
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2.2...11.1 g/s
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Engine speed
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ca. 1 400 rpm
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Notes on display zone 1:
The engine speed is raised in function 04 - Basic setting
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