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The scan tool indicates Diagnostic Trouble Code (DTC) P0303: Cylinder 3 misfire detected.Description Misfire detection is accomplished by monitoring the crankshaft speed with the crankshaft speed fluctuation (CKF) sensor which is attached to the crankshaft.If misfiring strong enough to damage the catalyst is detected, the MIL will blink during the time of its occurrence, and DTC P0301, P0302, P0303 or P0304 will be stored. Then, after the misfire has ceased, the MIL will come on.If misfiring that increases emissions is detected during two consecutive driving cycles, the MIL will come on, and DTC P0301, P0302, P0303 or P0304 will be stored.NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then recheck for the misfire DTC.P0106*4, P0107, P0108, P1 128*3, *5, P1 129*3, *5: MAP sensorP0131, P0132: HO2SP0171, P0172: Fuel supply systemP0335, P0336: CKF sensorP0401, P1491, P1498: EGR systemP0441: EVAP system Insufficient purge flow*6P1359, P1361, P1362: TDC sensorP1381, P1382: CYP sensor*4: '96 models*6: '96 D16Y5 engine, '96 D16Y7 engine, '96 D16Y8 engine (sedan), '97 D16Y5 engine, '97 D16Y7 engine (coupe: KA, KC models, sedan KA, KC, KL (DX) models, hatchback: all models), '97 D16Y8 engine (sedan: KA, KC models)Possible Cause