9-3 SE Sedan (9400) L4-2.0L Turbo (B204) HO (1999)
converter (oxygen sensor 2).
Once the conditions for the diagnosis have been fulfilled, the voltage changes from oxygen sensor 2 will be analysed. The catalytic converter is defective
if the voltage changes are too great with regard to engine load and speed.
Voltage changes from oxygen sensor 2 are corrected with respect to load and engine speed and totalled for 50 individual, approved periods for oxygen
sensor 1 *) Fault criteria are fulfilled if the total exceeds a calibrated value.
*) An approved period means that the sensor voltage pulse ratio is 30-80 % (+).
Conditions for diagnosis
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Diagnosis not yet performed during this trip
Catalytic converter heating:
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Vehicle speed >0 km/h
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Open throttle
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Engine speed (rpm) x load (kPa) =>60000
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Total acceleration >15 sec.
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Above conditions fulfilled for 120 sec.
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No period at idling speed >40 sec.
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No fuel shut-off >10 sec.
Evaluation of catalytic converter
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Vehicle speed 30-100 km/h.
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Open throttle
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Closed loop activated
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Engine speed (rpm) x load (kPa) = 60000 - 260000
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Engine coolant temperature >60C (>140F)
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Oxygen sensor 2>0.4 V on some occasion during this driving cycle
1
Measure: