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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-359 • Barometric pressure is higher than 76 kPa (22.4 in.Hg). • The engine load is with in the positive torque load. • Adaptive learning is complete for the vane which generates a crankshaft position signal. • While the engine is running, excluding sudden acceleration/deceleration and fuel shut-off opera- Judgement Criterion (change in the angular acceleration of the crankshaft is used for mis- • Misfire has occurred more frequently than allowed during the last 200 revolutions [when the °C (1,832 °F)]. or • Misfire has occurred in 2.0 percent or more of the last 1,000 revolutions (corresponding to 1.5 times . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Pattern 15 . TROUBLESHOOTING HINTS (The most • Ignition system related part(s) failed. • Low compression pressure. • ECM failed. DIAGNOSIS STEP 1. Visual check on ignition spark of No. 3 cylinder. YES : Go to Step 3. STEP 2. Check the No. 3 cylinder spark plug. − On-vehicle Service − Spark Plug Check And Cleaning . Q: Is the spark plug normal? YES : Refer to, Symptom Procedures 24 − Ignition Circuit System NO : Replace the No. 3 cylinder spark plug. Then go to Step 5. STEP 3. Check the compression. − Compression Pressure Check Q: Are there any abnormalities? YES : Repair or replace it. Then go to Step 5. AKX00432 Spark plug AC |