1997 Chevrolet Express Van Owner's Manual - Page 116

1 NOTICE: If you keepdriving your vehicle withthis 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 smoothly. as This could leadto costly repairs that may not be covered by your warranty. If the LightIs Flashing The followingmay prevent more serious damage to your vehicle: 0 Reducing vehicle speed. Avoiding hard accelerations. Avoiding steep uphill grades. If you are towing a trailer, reduce the amount of cargo being hauled as soon as it is possible. 0 0 l This light should come on, as a check to show you it is working, when the ignition is on and the engine is not running. If the light doesn't come on, haverepaired. it This light will also come on during a malfunction in one of two ways: I f the light stops flashingand remains on steady, see "If the Light Is On Steady" following. If the light continuesto flash, when it is safe todo so, stop the vehicle. Find a safe place to park your vehicle. Turn the key off, wait at least 10 seconds and restart the engine. If the light remains on steady, see "If the Light Is On Steady" following. If the light is still flashing, follow the previous steps, and drive the vehicle your to dealer or qualified service center for service. 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 is 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.