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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 253 (Engine Control System & Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0231 To DTC P0690) >> DTC P0420 or P0430 >> Conditions for Running the DTC

Conditions for Running the DTC

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  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 vehicle has been driven at more than 900 RPM for more than 20 seconds above 43 km/h (27 mph).
    • The vehicle is in Closed Loop.
    • The fuel level is greater than 10 percent.
    • The vehicle has Fuel Trim Learn enabled.
    • The Engine Coolant Temperature (ECT) parameter is between 70-128°C (158-262°F).
    • The Barometric Pressure (BARO) parameter is more than 70 kPa.
    • The Catalytic Converter Calculated Temperature parameter is greater than or equal to 500°C (932°F) for more than 1 minute.
    • The Intake Air Temperature (IAT) parameter is between -20 and +100°C (-4 and +212°F).
    • The battery voltage is more than 11 volts.
  2. DFCO Conditions
    • The DFCO period is greater than 1.75 seconds.
    • The heated oxygen sensor (HO2S) 1 is less than 300 mV prior to DFCO exit.
    • The HO2S 2 is less than 300 mV for 2 seconds prior to DFCO exit.
  3. DFCO Exit Conditions
    • The throttle position (TP) sensor travel is less than 30 percent.
    • The equivalence ratio is greater than 1.
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