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Evaluating measured value blocks, display groups 30...49 -Lambda regulation-
Evaluating measured value blocks, display groups 30...49 -Lambda regulation-
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Display group 30 -Lambda regulation-
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▪ Engine running at idling speed
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Read measured value block 30
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◂ Indicated on display
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xxx
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xxx
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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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Status of Lambda regulation after catalyst
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111
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Status of Lambda regulation before catalyst
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111
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=> Page 01-113
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Note on display zone 2:
The 3rd digit of the 3 digit number block is set to 1 first in part load/throttle range.
Significance of figures in 3-digit number block, display zones 1 and 2 - status of Lambda regulation before and after catalyst
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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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Significance
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1
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Lambda regulation active
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1
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Lambda probe operationally ready
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1
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Lambda probe heating on
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Display group 31 -Lambda regulation- constantly operating Lambda probes
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▪ Engine running at idling speed
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Read measured value block 31
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◂ Indicated on display
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x.xxxx
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x.xxxx
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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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Lambda specification Bank 1
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0.9900...1.0100
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---
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Lambda actual Bank 1
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0.9600...1.0400
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---
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Display group 32 -Lambda regulation- Lambda learnt values before catalyst
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▪ Engine running at idling speed
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Read measured value block 32
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◂ Indicated on display
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xx.x %
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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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Lambda learnt value at part load (multiplicative)
before catalyst
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-10.0...10.0 %
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=> Page 01-116
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Lambda learnt value at idling speed (additive)
before catalyst
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-10.0...10.0 %
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=> Page 01-116
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Notes on display zones 1 and 2:
Low values indicate that the engine is running too rich and therefore the Lambda regulation is leaning the mixture.
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◆ High values indicate that the engine is running too lean and therefore the Lambda regulation enriches the mixture.
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◆ add = additive - The effects of the fault (e.g. unmetered air) will reduce as the engine speed increases. The injection period will be modified by a fixed amount for additive learnt values. This amount is not dependent upon the basic injection period.
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◆ mul = multiplicative - The effects of the fault (e.g. faulty injector) will increase as the engine speed increases. A multiplicative learnt value is a proportional change to the injection period. This change is dependent on the basic injection period.
Evaluating display group 32, display zones 1 and 2 - Lambda learnt values before catalyst
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Appears on display
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Possible fault cause
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Fault elimination
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Low Lambda learnt values
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- Low learnt values at idling but with normal learnt values at part throttle: possible oil dilution (high level of fuel in oil)
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- Disappears after motorway drive or oil change
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- Injector leaking
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- Check injector
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- Activated charcoal filter solenoid valve 1 permanently open
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- Check activated charcoal filter solenoid valve 1 => Page 01-60
, Final control diagnosis
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- Lambda probe heating defective or Lambda probe soiled
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- Check Lambda probe heating
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Appears on display
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Possible fault cause
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Fault elimination
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High Lambda learnt values
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- High learnt values at idling speed, not so high learnt values at part throttle: possible unmetered air in area of intake manifold
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- Check intake air system for leaks
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- Injector blocked
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- Check injectors
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- Fuel pressure too low
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- Check fuel pressure regulator and holding pressure => Page 24-83
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- Lambda probe heating defective or Lambda probe soiled
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- Check Lambda probe heating
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- Unmetered air at exhaust manifold gasket
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- Check exhaust system for leaks:
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Display group 33 -Lambda regulation- Lambda regulation values before catalyst
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▪ Engine running at idling speed
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Read measured value block 33
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◂ Indicated on display
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xx.x %
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x.x V
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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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Lambda probe voltage before catalyst
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1.4...1.6 V
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---
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Lambda regulation before catalyst
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-15.0...15.0 %
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=> Page 01-119
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Notes on display zone 1:
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◆ The display must fluctuate around 0.0 %. If constant 0.0 % is displayed, the Lambda regulation has switched from regulation to control, because there is a fault in the Lambda regulation. Interrogate fault memory => Page 01-20
, Interrogating and erasing fault memory.
Notes on display zone 2:
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◆ The voltage signal "rich mixture (low level of residual oxygen)" is below 1.5 V.
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◆ The voltage signal "lean mixture (high level of residual oxygen)" is above 1.5 V.
Evaluating display group 33, display zone 1 - Lambda regulator before catalyst
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Appears on display
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Possible fault cause
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Fault elimination
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Outside tolerance range
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- Minus range: Mixture too rich, Lambda control weakens mixture
- Positive range: Mixture too lean, Lambda control enriches mixture
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- Wait 30 seconds until the display has stabilised
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- Injector defective
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- Check injectors=> Page 24-70
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- Lambda learnt value on limit
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- Check Lambda learnt value in display group 32
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Display group 34 -Lambda regulation- Lambda probe diagnosis before catalyst (checking ageing via amplitude duration monitoring)
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▪ Engine running at idling speed
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▪ Control unit in mode 04-Basic setting
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- Depress brake pedal
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Read measured value block 34
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◂ Indicated on display
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xxxx rpm
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xxx.x °C
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x.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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Result of Lambda probe before catalyst ageing check
(Test OFF / test ON / B1-P1 OK / B1-P1 n.OK)
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B1-P1 OK
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=> Page 01-121
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Dynamic factor of Lambda probe before catalyst
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1.0... 4.0
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---
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Catalyst temperature
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at least 340.0 °C
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Engine speed (idling speed)
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800...900 rpm
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=> Page 01-86
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Note on display zone 2:
Value calculated from engine speed and engine load.
Evaluating display group 34, display zone 4 - Lambda probe diagnosis before catalyst
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Appears on display
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Possible fault cause
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Fault elimination
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Lambda probe before catalyst not OK:
B1-P1 n.OK.
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- Fault stored in fault memory
- Lambda probe before catalyst defective
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- Read out fault memory
Perform test again, if the result is the same:
Check Lambda probe basic voltage before catalyst => Page 24-103
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Display group 41 -Lambda regulation- Lambda probe heating
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▪ Engine running at idling speed
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Read measured value block 41
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◂ Indicated on display
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Text
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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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Lambda probe heater after catalyst
(Htg.aC.OFF / Htg.aC.ON)
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Htg.aC.ON
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Lambda probe after catalyst internal resistance
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to 300 ω
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Lambda probe heater before catalyst
(Htg.bC.OFF / Htg.bC.ON)
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Htg.bC.ON
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Note on display zone 3:
This value is temperature dependent. Specifications are for an engine at operating temperature.
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Display group 34 -Lambda regulation- Diagnosis of Lambda probe after catalyst
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▪ Engine running at idling speed
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▪ Control unit in mode 04-Basic setting
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- Depress brake pedal
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Read measured value block 43
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◂ Indicated on display
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xxxx rpm
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xxx.x °C
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x.xx 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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Result of diagnosis of Lambda probe after catalyst
(Test OFF / Test ON / B1-P2 OK / B1-P2 n.OK)
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B1-P2 OK
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=> Page 01-124
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Lambda probe voltage
Lambda probe after catalyst
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0.00...1.00 V
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=> Page 01-124
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Catalyst temperature
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at least 340.0 °C
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---
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Engine speed (idling speed)
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800...900 rpm
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=> Page 01-86
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Note on display group 60:
The Lambda regulation after catalyst is the primary system and is used to guide the Lambda regulation before catalyst. It corrects light rich and lean displacements of the Lambda probe before catalyst by means of map-dependent correction displacements (max. + / - 2.5 %).
Evaluating display group 43, display zone 3 - Lambda probe voltage, Lambda probe after catalyst
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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 1.10 V
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- Short to positive via:
- Lambda probe, probe wiring, earth wiring, engine control unit
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- Check Lambda probe basic voltage after catalyst => Page 24-110
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Constant 0.00 V
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- Short to earth via:
- Lambda probe, probe wiring, earth wiring, engine control unit
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- Check Lambda probe wiring Lambda probe after catalyst
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Constant between
0.39...0.50 V
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- Open circuit via:
- Lambda probe, probe wiring, earth wiring, engine control unit
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Evaluating display group 43, display zone 4 - Lambda probe diagnosis after catalyst
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Appears on display
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Possible fault cause
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Fault elimination
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Lambda probe after catalyst not OK.:
B1-P2 n.OK.
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- Fault stored in fault memory
- Lambda probe after catalyst defective
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- Read out fault memory
Perform test again, if the result is the same:
Check Lambda probe basic voltage after catalyst => Page 24-111
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Display group 46 -Lambda regulation- Catalyst diagnosis (conversion test)
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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 46
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⇒
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◂ Indicated on display
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xxxx rpm
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xxx.x °C
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x.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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Result of catalyst conversion test
(Test OFF / test ON / Cat B1 OK/Cat B1 n.OK)
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Cat B1 OK
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Catalyst effect
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min. 1%
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=> Page 01-126
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Catalyst temperature
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at least 340.0 °C
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Engine speed
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1300...1500 rpm
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Evaluating display group 46, display zone 3 - Catalyst efficiency
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Appears on display
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Possible fault cause
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Fault elimination
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Smaller than 1 %
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- Catalyst defective
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- Read out fault memory
Perform test again, if the result is the same:
Replace catalyst
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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 TVV OK / n.OK)
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TVV OK
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=> Page 01-128
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Idling speed regulation deviation for TW diagnosis
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-50...50 %
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Lambda regulation deviation for TW diagnosis
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-50...50 %
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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
Evaluating display group 70, display zone 4 - Tank venting system diagnosis
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Appears on display
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Possible fault cause
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Fault elimination
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Check has not been performed or is not complete:
Test OFF
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- Fault stored in fault memory
- Conditions for performing diagnosis have not been achieved
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- Read fault memory
Check test prerequisites, repeat test
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Tank venting system
not functioning correctly:
TW n.OK.
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- Fault stored in fault memory
- Hose connections between tank vent valve and intake pipe not connected/leaking
- Hose connections between tank vent valve and intake pipe blocked/not through flow
- Tank vent valve defective
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- Read fault memory
Fit hose/renew
Check activated charcoal filter solenoid valve 1 => Page 01-60
, Final control diagnosis
Check hose for through flow, replace if necessary, repeat test
Exchange tank vent, repeat test
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