1994 GMC Safari Owner's Manual - Page 262

Malfunction Indicator Lamp (SERVICE ENGINE SOON ) This light on your instrument cluster lets you know when your emission system needs service. The light will come on briefly when you start your engine to let you know that the system working. If it does not come on is when you start your engine, or if it comes on and stayson while you're driving, your system may needservice. Your vehicle should stillbe driveable, but you should have your system serviced right away. Loading Your Vehicle This iscalled the GVWR (Gross Vehicle Weight Rating). GVWR The includes the weight of the vehicle, all occupants, fuel and cargo. The CertificationRirelabel also tells you the maximum weightsfor the front and rear axles, called Gross Axle Weight Rating (GAWR). To find out the actual loads on your front and rear axles, you need to goto a weigh station and weighyour vehicle. Your dealer can help you with this. Be sure to spread out your load equally on both sides of the centerline. Never exceed the GVWRfor your vehicle, or the Gross Axle Weight Rating (GAWR) for either the front or rear axle. 6-44