A3 Mk1
Checking lambda control
Checking lambda probe heater -Z29 for lambda probe downstream of catalytic converter
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Special tools and workshop equipment required
Test requirements: |
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder Test sequence
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If specified value is not attained:
If specified value is attained:
Checking voltage supply for lambda probe heating |
Note: Points at which Lambda probe heating is switched on and off by engine control unit can be observed in "Reading measured value block" function, display group number 041 and display zone 4. If no voltage is present: |
If no voltage is present:
=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder |
If voltage supply is OK:
If no voltage is present:
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If wiring is OK but there is no earth connection for the Lambda probe heating:
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