1995 Chevrolet S10 Pickup Owner's Manual - Page 106

Malfunction Indicator Lamp (SERVICE ENGINE SOON Light) Your vehicle is equipped with an onboard computerwhich monitors operation of the emission control system. This systemcalled OBD I1 is (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life the vehicle, helping to of produce a cleaner environment. The "SERVICE ENGINE SOON' light comes on to indicate when service isrequired. Malfunctions often will be indicated by the system beforeany problem is apparent, which may prevent more serious damage to your vehicle. This systemis also designed to assist your service technician in correctly diagnosing any malfunction. The "SERVICE ENGINE SOON, light should come on,as a checkto show you it is working, when the ignition is on and the engine is running. This not light will also come during a malfunction in one of two ways: 0 Light on steady - indicates a systemmalfunction has been detected. Drive the vehicle to the dealer for service at your first opportunity. Light flashing- indicates a misfirehas been detected which may damage the emission control system. The damage be reduced by may lowering thevehicle speed, reducing the amount of cargo being hauled or trailered, avoiding hard acceleration, or by avoiding steepuphill grades. If these actions are effective, the light will stop flashingand remain on steady. Drive the vehicleto a dealer for service. If the light continues to flash, stop the vehicle. Wait for a steady light to come on, then drive thevehicle to a dealer for service. 0 These following conditions also cause the "SERVICE ENGINE may SOON" light to comeon: Low FueVOut of Fuel -As the vehicle startsto run out of fuel the "SERVICE ENGINE SOON" light may come on as aresult of an engine misfire. Filling your gasoline tank should correct this condition. Make sure to install the gas capfully. It will require afew driving trips to turn the light off. Poor Quality Fuel- Be sureto fuel your vehicle with quality fuel. Your engine may not run efficiently on poor fuel. Poor fuel may cause stalling, hesitation or misfire. These conditionsmay go away when the engineis warned-up. However, poor quality fuel may cause the"SERVICE ENGINE SOON, light to come on. Have a dealer check the vehicle. If no problems are found, you may want to change to another brand of fuel. Driving Through Standing Water - Driving your vehicle through puddles of deep standingwater may result in a temporary misfire condition. This condition will usually correct itself shortly after the electrical system dries out. It will require afew driving trips to turn the lightoff. 2-61