2001 Pontiac Aztek Owner's Manual - Page 171

If the traction control system warning light comes on and stays on for an extended period of time when the system is turned on, your vehicle needs service. Malfunction Indicator Lamp (Service Engine Soon Light in the United States or Check Engine Light in Canada) Engine Coolant Temperature Gage This gage shows the engine coolant temperature. If the gage pointer moves into the red area, your engine is too hot! 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 SERVICE ENGINE SOON or 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. It means that your engine coolant has overheated. If you have been operating your vehicle under normal driving conditions, you should pull off the road, stop your vehicle and turn off the engine as soon as possible. See "Engine Overheating" in the Index. 2-87