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Evaluating measured value blocks, display groups 70...89 -Reducing emissions-
Evaluating measured value blocks, display groups 70...89 -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 minimum 60 °C (display group 04, display zone 3)
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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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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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Idling speed regulator deviation during TBV diagnosis
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Lambda regulation deviation in TBV diagnosis
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Activated charcoal filter system solenoid valve 1 duty cycle
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0...100 %
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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- EGR-position 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 74
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◂ Indicated on display
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x.x V
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x.x V
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xx %
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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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Adaption condition (ADP runs, ADP OK or ADP ERROR)
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ADP OK
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---
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Actual potentiometer value
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0...100%
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---
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Max. stop
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3.0...4.8 V
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---
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Zero position
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0.3...1.5 V
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1)
Erase learnt values and adapt engine control unit to throttle valve control part and exhaust gas recirculation valve
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Notes on display group 74:
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◆ Adaption of exhaust gas recirculation valve takes place when ignition is switched on.
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◆ When selecting function 04 "basic settings" of display group 74, the engine control unit is adapted to the exhaust gas recirculation valve. This process must be carried out if another exhaust gas recirculation valve (or a complete engine) or another engine control unit has been fitted.
Engine code AVU
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Display group 75 -Exhaust gas recirculation
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▪ Engine running at idling speed
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▪ Control unit in mode 04-Basic settings
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Read measured value block 75
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◂ Indicated on display
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xxxx rpm
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xxx %
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xxx.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 test on / test off /
Sys. OK / Sys. n.OK
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Sys. OK
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---
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Valve stroke difference
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-10...25 %
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---
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Degree opened potentiometer value
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0...100 %
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Engine speed (idling speed)
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640...900 rpm
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=> Page 01-113
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Display group 77 -Reducing emissions- Secondary air system diagnosis
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▪ Control unit in mode 04-Basic setting
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- Depress brake pedal
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▪ Vehicle stationary, engine runs at increased idling speed
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Read measured value block 77
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◂ Indicated on display
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xxx rpm
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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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---
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Irrelevant
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Irrelevant
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Engine speed (idling speed)
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Approx. 1400 rpm
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=> Page 01-113
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Engine code AVU
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Display group 89 -Trip recorder- Exhaust gas warning lamp lights up
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▪ Engine running at idling speed
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Read measured value block 89
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⇒
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◂ Indicated on display
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xxxx km
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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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Condition "tank empty" (OK. / too low)
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Distance travelled with exhaust warning lamp "MIL" on
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Note:
Significance of exhaust gas warning lamp => Page 01-8
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