1997 Chevrolet S10 Pickup Owner's Manual - Page 107

Malfunction Indicator Lamp (Service Engine Soon Li-ght)' Yaw vehicle is eq-uipped with a computer which monitors .operation of the fuel, igniti.on and ernis-sion control systems. NOTICE: If you keep driving yourvehicle with this-light a not on, ,after while,- your ernitision controls may work as:well, your fuel economy may not asbe good and your engine may not run smoothly. as. This could lead to. costly repairs that not be may covered by your warranty. This light should ceme on, as a check to show you it is working, when the ignition ison and the engine is not running. If the light doesn't come an, have-itrepaired. This light will also come on during a malfuncti-onin one of two ways: SERVICE ENGINE SOON This .systemis called OBD I1 (On-Board Diagnostics-Second Generation) and. is intended to .assurethat ernisstons are.at acceptable levels,fo.r the l-ifeof the vehicle, helping to produce a clearier environment, (In Canada,:OBD I1 is replaced by Enhanced Diqgnostics.) The SERVICE ENGINE SOON light comes on to indicate that there is a-problem..ancl service is require-d. Malfunctions often will be indicated by the system before .anyproble,mis apparent. This may prevent more serious.damage t o your vehicle. This system is al-sodesigned to assistyour servi:ce:technician i correctly di-agnosing anymalfunction. n Light Flashing -- A misfire condition has been detected. A misfire increases vehicle-emis-sions and may damage the emission control-system on your vehicle. Dealer or qualified service center diagnosis and service is'required. L&ht On: Steady .An erni,ssion control system -malfunction has been detected on your vehicle. Dealer or qualified service center diagnosis.and service may b:e required.