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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Control System & Fuel System - 5.3L - DTC P0420 To DTC P3449) >> DTC P0420 >> Conditions for Running the DTC

Conditions for Running the DTC

WARNING: This page is about a different variant/trim than selected.
  1. Driving Conditions
    • DTCs P0030, P0031, P0036, P0037, P0038, P0068, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0220, P0300, P0315, P0326, P0327, P0336, P0340, P0341, P0442, P0446, P0452, P0453, P0455, P0496, P0500, P0502, P0506, P0507, P0601, P0602, P0606, P0641, P0722, P0723, P1133, P1134, P1516, P1621, P2135, P2138, P2176 are not set.
    • The engine has been running for greater than 2 minutes.
    • The vehicle has been driven at greater than 1,000 RPM with the mas air flow (MAF) greater than 18 g/s for greater than 30 seconds.
    • The vehicle is in Closed Loop.
    • The vehicle has Fuel Trim Learn enabled.
    • The engine coolant temperature (ECT) is between 45-128°C (113-262°F).
    • The barometric pressure (BARO) is greater than 70 kPa.
    • The catalytic converter calculated temperature is greater than or equal to 420°C (788°F).
    • The intake air temperature (IAT) is between -20 and +85°C (-4 and +185°F).
    • The battery voltage is greater than 11 volts.
  2. Idle Conditions
    • The vehicle speed is less than 3.2 km/h (2 mph).
    • For automatic transmissions, the transmission is in Reverse, Drive, or Low.
    • The throttle position (TP) is less than 2 percent.
    • The short term fuel trim (FT) is between -10 and +10 percent.
    • This diagnostic attempts one test during each valid idle period until a pass or fail decision has been reached when the above conditions have been met. This diagnostic attempts up to 6 completed tests during each drive cycle.
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