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Home >> Subaru >> 2006 >> Outback R >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H6DO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Enable Condition

Enable Condition

ENABLE CONDITION REFERENCE CHART

Secondary Parameters Enable Conditions
Battery voltage > 10.9 V
Atmospheric pressure > 75.1 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature ≥75°C(167°F)
Catalyst warm-up counter (Map 2) ≥8800
Misfire detection every 200 rotations < 5 times
Sub feedback In operation
Evaporative system diagnosis Not in operation
Time of difference (< 0.10) between actual and target lambda 1000 milliseconds or more
Vehicle speed ≥ 70 km/h (43 MPH)
Amount of intake air 10 ←→ 40 g (0.35 ←→ 1.41 oz)/s
Rear oxygen output change from lower than to higher than 600 mV Experienced after fuel cut
Load change absolute value < 0.02 g (0.007 oz)/rev
Total time of canister purge operation ≥ 5 sec.
Learning value of evaporation gas density ≤0.2
After engine starting ≥ 205 sec.

Map 2 

Add the following value every 512 milliseconds.

EVAPORATION GAS DENSITY

Intake amount of air (g(oz)/s) 0(0) 3.2 (0.113) 6.4 (0.226) 9.6 (0.339) 12.8 (0.451) 16 (0.564) 19.2 (0.677) 22.4 (0.790) 25.6 (0.903) 28.8 (1.016) 32 (1.129) 35.2 (1.242)
Total value for warm-up counter -19 -8 11 19 30 44 61 81 104 130 159 161