|
|
TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) 13A-151 YES : Replace engine-ECU <M/T> or engine-A/T-ECU <A/T>. NO : Intermittent malfunction (Refer to GROUP − How to Use Troubleshooting/Inspection Service Points ). Code No. P0304: No. 4 Cylinder Misfire Detected OPERATION • Refer to Code No. P0204 No. 4 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-A/T-ECU <A/T> checks for such changes in engine speed. TROUBLE JUDGMENT Check Conditions • Engine speed is 500 − 6,500 r/min. • Engine coolant temperature is −10°C or higher. • Barometric pressure is 76 kPa or higher. • Volumetric efficiency is between 30% and 55 %. • Adaptive learning is complete for the vane which generates a crankshaft position signal. • While the engine is running, excluding gear shifting, deceleration, sudden • The throttle deviation is −0.06 V/10 ms to +0.06 V/10 ms. Judgment Criteria (change in the angular acceleration of the crankshaft is used for • Misfire has occurred more frequently than the limit during the last 200 revolutions (when the °C or higher). or • Misfire has occurred 15 times or more in the last 1,000 revolutions (that has been equivalent to PROBABLE CAUSE • Ignition system related part(s) failed • Low compression pressure • Failed engine-ECU <M/T> • Failed engine-A/T-ECU <A/T> DIAGNOSIS PROCEDURE STEP 1. Check the ignition coil spark. Q: Is the check result normal? YES : Go to Step 2 . NO : Check ignition Circuit System (Refer to STEP 2. Connector check: B-105 No. 4 injector Q: Is the check result normal? YES : Go to Step 3 . NO : Repair or replace. STEP 3. Check No. 4 injector itself. • Check Injector itself (Refer to Q: Is the check result normal? YES : Go to Step 4 . NO : Replace No. 4 injector. AK300978 M 1 2 AM B-105 (GR) Harness side connector Connector: B-105 |