Conditions for Running the DTC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0068, P0013, P0014, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0122, P0123, P0125, P0128, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0300, P0301-P0306, P0326, P0327, P0332, P0336, P0340, P0341, P0442, P0446, P0452, P0453, P0455, P0496, P0502, P0506, P0507, P0601, P0602, P0604, P0606, P0641, P0651, P1133, P1134, P1137, P1138, P1516, P1621, P1680, P1681, P2101, P2120, P2125, P2135, P2138, P2176 are not set.
The engine speed is more than 1,000 RPM for a minimum of 34 seconds.
The engine speed is within 150 RPM of the desired idle.
The engine coolant temperature (ECT) is between 70-125° C (158-257° F).
The barometric pressure (BARO) is more than 75 kPa.
The vehicle is in Closed Loop.
The intake air temperature (IAT) is between -20.5 and +80° C (-5 and +176° F).
The battery voltage is more than 11 volts.
The engine run time is more than 9 minutes.
The vehicle speed is less than 4.8 km/h (3 mph).
The engine load must be stable.
The numbers of test attempts per trip are less than 12.
The predicted catalyst temperature is between 475-675° C (887-1247° F).
Test the catalyst by performing the following procedures:
- Idle the engine and place the vehicle in Drive, or depress the clutch pedal for a manual transmission vehicle, to activate the diagnostic. Within 60 seconds, the air fuel ratio will become lean, below 14.1, for up to 7 seconds, and then may become rich, above 15.3, for up to 7 seconds.
- Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.