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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls And Fuel - 6.2L - DTC P0300 To DTC P1175 >> DTC P0420 or P0430 >> Conditions for Running the DTC

Conditions for Running the DTC

  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 (manual transmission only), 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 more than 2 minutes.
    • The vehicle has been driven at more than 1,000 RPM for more than 10 seconds.
    • The vehicle is in Closed Loop.
    • The vehicle has Fuel Trim Learn enabled.
    • The Engine Coolant Temperature (ECT) parameter is between 45-128°C (113-262°F).
    • The Barometric Pressure (BARO) parameter is more than 70 kPa.
    • The Catalytic Converter Calculated Temperature parameter is greater than or equal to 375°C (707°F).
    • The Intake Air Temperature (IAT) parameter is between -20 and +85°C (-4 and +185°F).
    • The battery voltage is more 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) parameter is 2 percent or less.
    • The short term fuel trim (FT) is between -10 and +10 percent.
    • This diagnostic attempts one test during each valid idle period when the above conditions have been met. This diagnostic attempts up to 6 tests during each drive cycle.
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