1997 Pontiac Trans Sport Owner's Manual - Page 204

Malfunction Indicator Lamp (Service Engine Soon Light) SERVICE ENGINE SOON environment. (In Canada,OBD I1 is replaced by Enhanced Diagnostics.)The SERVICE ENGINE SOON light comeson and a chime will sound to indicate that there is a problem and service required. Malfunctions is by often will be indicated the system before any problem is apparent. This may prevent moreserious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. CHECK 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 as good and your engine may not run smoothly. This could lead to costly repairs that may not be covered by your warranty. Domestic Canadian Your Pontiac is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. This systemis called OBD I1 (On-Board Diagnostics-Second Generation) and intended to is assure that emissions at acceptable levels for life are the of the vehicle, helpingto produce a cleaner 2-103