Conditions for Running

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The engine load must be stable.
DTCs P0420 and P0430 are not set.
The barometric pressure is more than 74 kPa.
The engine coolant temperature (ECT) is between 70-120° C (158-248° F).
The engine has been running for more than 10 minutes.
The engine is in Closed Loop fuel control.
The battery voltage is more than 10-18 volts.
The intake air temperature (IAT) is between -7 and +85° C (+20 and +185° F).
The difference between the engine speed and the desired engine speed is less than 200 RPM.