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EC-266 < DTC/CIRCUIT DIAGNOSIS > [VQ35DE] P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE DTC Logic INFOID:0000000009720000 DTC DETECTION LOGIC When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crank- The misfire detection logic consists of the following two conditions. 1. One Trip Detection Logic (Three Way Catalyst Damage) 2. Two Trip Detection Logic (Exhaust quality deterioration) DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following procedure Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE-I 1. Start engine and warm it up to normal operating temperature. 2. Turn ignition switch OFF and wait at least 10 seconds. 3. Turn ignition switch ON. 4. Turn ignition switch OFF and wait at least 10 seconds. 5. Restart engine and let it idle for approximately 15 minutes. 6. Check 1st trip DTC. Is 1st trip DTC detected? Sensor Input signal to ECM ECM function Crankshaft position sensor (POS) Engine speed On board diagnosis of misfire DTC No. Trouble diagnosis name DTC detecting condition Possible cause P0300 Multiple cylinder misfires detected Multiple cylinders misfire. • Improper spark plug P0301 No. 1 cylinder misfire detected No. 1 cylinder misfires. P0302 No. 2 cylinder misfire detected No. 2 cylinder misfires. P0303 No. 3 cylinder misfire detected No. 3 cylinder misfires. P0304 No. 4 cylinder misfire detected No. 4 cylinder misfires. P0305 No. 5 cylinder misfire detected No. 5 cylinder misfires. P0306 No. 6 cylinder misfire detected No. 6 cylinder misfires. |