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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4A9> 13A-118 Code No. P0301: No. 1 Cylinder Misfire Detected OPERATION • Refer to Code No. P0201: No. 1 Injector System FUNCTION • If a misfire occurs while the engine is running, the engine speed changes for an instant. • The engine-ECU <M/T> or engine-CVT-ECU <CVT> checks for such changes in engine TROUBLE JUDGMENT Check Conditions • Engine speed is 500 − 4,500 r/min. • Engine coolant temperature is −10°C or higher. • The intake manifold pressure is above 30 kPa <M/T>. • Barometric pressure is 76 kPa or higher <CVT>. • Volumetric efficiency is between 30 % and 55 % <CVT>. • Adaptive learning is complete for the vane which generates a crankshaft position signal. • While the engine is running, excluding gear shift- ing, deceleration, sudden acceleration/decelera- • The throttle deviation is −0.06 V/10 ms to +0.06 V/10 ms. Judgment Criteria (change in the angular accel- eration of the crankshaft is used for misfire • Misfire has occurred more frequently than the limit during the last 200 revolutions (when the cat- °C or higher). or • Misfire has occurred 15 times or more in the last 1,000 revolutions (that has been equivalent to PROBABLE CAUSES • Ignition system related part(s) failed • Low compression pressure • Failed engine-ECU <M/T> or engine-CVT-ECU <CVT> DIAGNOSIS PROCEDURE STEP 1. Visual check of ignition spark. • Remove the spark plug and install it to the ignition coil. • Connect the ignition coil connector. • Remove all injector connector. • At the engine start, check each spark plug pro- duces a spark. Q: Is the check result normal? YES : Go to Step 2 . NO : Check ignition circuit system (Refer to STEP 2. Connector check: A-102 No. 1 injector Q: Is the check result normal? YES : Go to Step 3 . NO : Repair or replace the connector. STEP 3. Check No. 1 injector itself. • Check Injector itself (Refer to ). Q: Is the check result normal? YES : Go to Step 4 . NO : Replace the No. 1 injector. AK402147 M 1 2 A-102 (G) Connector: A-102 AC A-102 Harness side connector Main Index Group TOC |