mobilmail написал(а):
На заведенном двигателе сигнал от лямбды постоянно меняется в диапазоне от 0 до 0.8В.
Если верить ельзе на моторе AUD стоит ШДК, а не триггерная лямбда. "Живость" определяется к-том динамики гр 34 поле 3. " у новой ШДК, ниже 0.5 -труп.
Evaluating measured value blocks, display grps 30...49, 99 -Lambda regulation-
Evaluating measured value blocks, display grps 30...49, 99 -Lambda regulation-
Display group 30 -Lambda regulation-
▪ Engine running at idling speed
Read measured value block 30
⇒
◂ Indicated on display
xxx
xxx
---
---
1
2
3
4
◂ Display zones
Specification
Evaluation
Status of Lambda regulation after catalyst1)
▪ Catalyst temperature at least 400.0 °C
▪ (=>display group 34, display zone 2)
111
=> Page 01-111
Status of Lambda regulation before catalyst
111
=> Page 01-111
1) Only engines conforming to EU 4 standard (engine code AKP, AUC, AUD)
Notes on display zones 1 and 2:
◆ The first position in 3-digit number block fluctuates between 0 and 1 (Lambda probe heating off and on).
◆ Depending on status of Lambda regulation 0 or 1 is displayed alternately in 3-digit number block.
◆ The bits in display zones 1 and 2 are set to 1, when the catalyst temperature has exceeded 400.0 °C (=> display group 34, display zone 2).
Significance of figures in 3-digit number block, display zones 1 and 2 - status of Lambda regulation before and after catalyst
Significance if display = 1
1
2
3
Significance
1
Lambda regulation active
1
Lambda probe operationally ready
1
Lambda probe heating on
Display group 32 -Lambda regulation- Lambda learnt values before catalyst
▪ Engine running at idling speed
Read measured value block 32
⇒
◂ Indicated on display
xx.x %
xx.x %
---
---
1
2
3
4
◂ Display zones
Specification
Evaluation
Lambda learnt value at part load (multiplicative) before catalyst
-10.0...10.0 %
=> Page 01-114
Lambda learnt value at idling speed (additive) before catalyst
-10.0...10.0 %
=> Page 01-114
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.
◆ High values indicate that the engine is running too lean and therefore the Lambda regulation enriches the mixture.
◆ If there is no voltage supply to the control unit all the values learnt will be cancelled.
◆ 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.
◆ 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.
Initiating learning process: Control unit in mode 04, Basic settings
◆ Learning conditions for idling: Idling, coolant temperature min. 75 °C, intake air temperature max. 90 °C
◆ Learning conditions for part load: coolant temperature min. 75 °C, intake air temperature max. 90 °C
Evaluating display group 32, display zones 1 and 2 - Lambda learnt values before catalyst
Appears on display
Possible fault cause
Fault elimination
Low Lambda learnt values
- Low learnt values at idling but with normal learnt values at part throttle: possible oil dilution (high level of fuel in oil)
- Disappears after motorway drive or oil change
- Injector leaking
- Check injector =>Page 24-76
- Fuel pressure too high
- Check fuel pressure regulator and holding pressure => Page 24-86
- Tank venting valve for activated charcoal filter permanently open
- Check tank venting valve
=> Page 01-56, final control diagnosis
- Lambda probe heating defective or Lambda probe soiled
- Check Lambda probe heating before catalyst =>Page 24-34
Appears on display
Possible fault cause
Fault elimination
High Lambda learnt values
- High learnt values at idling speed, not so high learnt values at part throttle: possible unmetered air in area of intake manifold
- Check intake air system for leaks
=>Page 24-91
- Injector blocked
- Check injectors =>Page 24-76
- Fuel pressure too low
- Check fuel pressure regulator and holding pressure => Page 24-86
- Unmetered air at exhaust manifold gasket
- Lambda probe heating defective or Lambda probe soiled
- Check Lambda probe heating before catalyst =>Page 24-34
Display group 33 -Lambda regulation- Lambda regulation values before catalyst
▪ Engine running at idling speed
Read measured value block 33
⇒
◂ Indicated on display
xx.x %
x.xxx V
---
---
1
2
3
4
◂ Display zones
Specification
Evaluation
Lambda probe voltage before catalyst
1.000...2.000 V
---
Lambda regulator before catalyst
-10.0...10.0 %
=> Page 01-117
Notes on display zone 1:
◆ 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 01-18.
Evaluating display group 33, display zone 1 - Lambda regulator before catalyst
Appears on display
Possible fault cause
Fault elimination
Outside tolerance range
- Minus range: Mixture too rich, Lambda control weakens mixture
- Positive range: Mixture too lean, Lambda control enriches mixture
- Wait 30 seconds until the display has stabilised
- Unmetered air
- Check intake system for leaks
=> Page 24-91
- Injector defective
- Check injectors =>Page 24-76
- Lambda learnt value on limit
- Check Lambda learnt value in display group 32
Only engines conforming to EU 4 standard (engine code AKP, AUC, AUD)
Display group 34 -Lambda regulation- Lambda probe diagnosis before catalyst (checking ageing via amplitude duration monitoring)
▪ Control unit in mode 04-Basic setting
- Depress brake pedal
▪ Vehicle stationary, engine runs at increased idling speed
Read measured value block 34
⇒
◂ Indicated on display
xxxx rpm
xxx.x °C
x.xx
Text
1
2
3
4
◂ Display zones
Specification
Evaluation
Result of Lambda probe before catalyst ageing check
(Test OFF / test ON / B1-P1 OK / B1-P1 n.OK)
B1-P1 OK
---
Amplitude duration Lambda probe before catalyst
0.7... 2.00
---
Catalyst temperature
min. 400.0 °C
---
Engine speed
Amplitude duration Lambda probe before catalyst
0.7... 2.00
При заправке скачут обороты, а при выкл двигле потом оч. плохо заводится. чё делать????????
