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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (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

WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.
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