Malfunction Indicator LampCheck Engine LightA computer system called OBD II (On-BoardDiagnostics-Second Generation) monitors operation ofthe fuel, ignition, and emission control systems. It makessure that emissions are at acceptable levels for the lifeof the vehicle, helping to produce a cleaner environment.The check engine lightcomes on to indicatethat there is an OBD IIproblem and serviceis required.Malfunctions often are indicated by the system beforeany problem is apparent. This can prevent more seriousdamage to your vehicle. This system is also designedto assist your service technician in correctly diagnosingany malfunction.Notice: If you keep driving your vehicle with thislight on, after a while, the emission controlsmight not work as well, your vehicle’s fuel economymight not be as good, and the engine might notrun as smoothly. This could lead to costly repairsthat might not be covered by your warranty.Notice: Modifications made to the engine,transmission, exhaust, intake, or fuel system ofyour vehicle or the replacement of the original tireswith other than those of the same Tire PerformanceCriteria (TPC) can affect your vehicle’s emissioncontrols and can cause this light to come on.Modifications to these systems could lead to costlyrepairs not covered by your warranty. This couldalso result in a failure to pass a required EmissionInspection/Maintenance test. See Accessoriesand Modifications on page 5-3.This light comes on, as a check to show it is working,when the ignition is turned ON/RUN but the engine is notrunning. If the light does not come on, have it repaired.This light also comes on during a malfunction inone of two ways:• Light Flashing — A misfire condition has beendetected. A misfire increases vehicle emissionsand could damage the emission control systemon your vehicle. Diagnosis and service mightbe required.• Light On Steady — An emission control systemmalfunction has been detected on your vehicle.Diagnosis and service might be required.3-40
