A3 Mk1
Testing lambda control
Testing operation
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→ Display readout: |
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Do not proceed with the test until the coolant temperature shown in display zone 2 has reached at least 80 °C. Display zone 3 will show the voltage of the lambda probe signal.
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→ Display readout: |
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Display zone 4 will show the status of the Lambda control. Relevance of figures in 8 digit number block in display zone 4 (see also Page 01-103):
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→ Display readout: |
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If the lambda control has reached one of its stop limits (i.e. if the "Lambda control at stop limit" space contains a "1"), the "Mixture status" space will indicate which of the stops the lambda control is at. |
→ Display readout: |
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If the Lambda control has reached a stop limit and the "Mixture status" space is showing a "1" continuously, this means that the Lambda control is at the maximum leaning down limit but the Lambda probe is still registering "Mixture too rich". |
→ Display readout: |
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If the Lambda control has reached a stop limit and the "Mixture status" space is showing a "0"continuously, this means that the Lambda control is at the maximum enrichment limit but the Lambda probe is still registering "Mixture too lean". Note: If the Lambda control remains at either of the stop limits ("too rich" or "too lean") for a certain period of time a fault will be recorded in the fault memory.
The mixture adaptation system has learning ability, i.e. the lambda control can recognise differences between various engines (injector nozzle delivery, compression, fuel pressure etc.) and compensates by adjusting the pre programmed basic injection periods in the map in the control unit. The injection periods are extended or reduced until a "λ = 1" mixture composition is achieved. |
→ Display readout: |
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Display zone 2 shows the Lambda learned value for idling.
Display zone 3 shows the Lambda learned value for part throttle.
Specifications: => Page 01-88. |