porsche Workshop Repair Guides

Porsche Workshop Service and Repair Manuals

Catalytic Converter|Description and Operation|Page 1347 > < Catalytic Converter|Description and Operation
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no fault of throttle position sensor

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no fault of canister purge valve

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no fault of canister purge valve power stage

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no fault of mass airflow sensor

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no fault of misfire detection

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no fault of engine coolant temperature sensor

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no fault of secondary air system

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no fault of upstream oxygen sensor

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no fault of downstream oxygen sensor

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no activity of forced oxygen removal

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modeled catalyst temperature within calibrated range

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modeled catalyst temperature gradient lies below calibrated threshold

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engine exhaust gas mass flow within calibrated range

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time after engine start exceeds calibrated threshold

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desired air-fuel ratio for catalyst diagnosis applied

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engine start temperature exceeds calibrated threshold

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diagnosis of catalyst not yet performed

Flowchart

Catalytic Converter|Description and Operation|Page 1347 > < Catalytic Converter|Description and Operation