1997 Chevrolet Suburban Owner's Manual - Page 140
1997 Chevrolet Suburban Manual
Page 140 highlights
Malfunction Indicator Lamp (Service Engine Soon Light) (Gasoline Engine) Your vehicle is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. I NOTICE: If you keep driving your vehicle with this light on, after a while, your emission controls may not work as well, your fuel economy may not be as good and your engine may not run as smoothly. This could lead to costly repairsthat may not be covered by your warranty. This light should come on, as a check to show you it is working, when the ignition is on and the engine is not it repaired. running. If the light doesn't come on, have This lightwill also comeon during a malfunction in one of two ways: 0 SERVICE ENGINE SOON This system is called OBD I1 (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. (In Canada, OBD I1 is replaced by Enhanced Diagnostics.) The SERVICE ENGINE SOON light comes on toindicate 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 yourvehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. Light Flashing -- A misfire condition has been detected. A misfire increases vehicle emissions and may damage theemission control system on your vehicle. Dealer or qualified service center diagnosis and service is required. Light On Steady -- An emission control system malfunction has beendetected on your vehicle. Dealer or qualifiedservice center diagnosis and service may be required. 0 2-69