2001 Chevrolet Malibu Owner's Manual - Page 123

Low Coolant Warning Light This light comes on briefly when you turn your ignition on. Malfunction Indicator Lamp (Check Engine Light) If this light comes on and stays on, the vehicle should promptly be pulled off the road and the coolant level checked. The coolant level could be too low. See "Engine Coolant" in the Index. If there are visible signs of steam, see "Engine Overheating" in the Index before opening the hood. Have your vehicle serviced as soon as you can. United States Canada Your vehicle is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The CHECK ENGINE light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. 2-58