Conditions for Running

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Suburban, and 2003 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Coolant Temperature (ECT) is more than 135°F (57°C).
The engine is running in Closed Loop fuel control.
The engine has been running for more than 160 seconds.
The battery voltage is between 10-18 volts.