1998 Chevrolet Lumina Owner's Manual - Page 133

This system is called OBD1 (On-Board 1 Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helpingto produce a cleaner environment. The SERVICE ENGINE SOON light comes onto indicate that there a problem and service is is required. Malfunctions often will be indicated by the system before any problem is apparent. may This prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. This light should come as a check to show you is on, it working, when the ignition is on and engine is not the running. If the light doesn't come on, have it repaired. This light will also come on during a malfunction one in of two ways: 0 Light Flashing-- A misfire condition has been detected. A misfire increases vehicle emissions and may damage the emission control system on your vehicle. Dealer or qualified service center diagnosis and service may be required. Light On Steady-- An emission control system malfunction has been detected on your vehicle. Dealer or qualified service center diagnosis and service may be required. 0 NOTICE: If you keep driving your vehicle with this light If the Light Is Flashing on, after a while, your emission controls may not The following may prevent more serious damage to work as well, your fuel economy may not be as your vehicle: good and your engine may not run smoothly. as This could lead to costly repairs that may not be 0 Reducing vehicle speed. covered by your warranty. Avoiding hard accelerations. Avoiding steep uphill grades. 0 If you are towing a trailer, reduce the amount of cargo being hauled as soon as is possible. it 2-57