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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-425 • 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 • The occurrence rate of engine misfiring within the 1,000 engine revolutions is more than 1.7 % . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − . . TROUBLESHOOTING HINTS (The most • Spark plug failed. • Ignition system related part(s) failed. • Low compression pressure. • ECM failed. DIAGNOSIS STEP 1. Check the No. 5 cylinder ignition coil spark. ignition coil. (4) Ground the spark plug side electrode securely. • When the engine is cranked, the spark plug should spark. Q: Did it spark? YES : Go to Step 3. STEP 2. Check the No. 5 cylinder spark plugs. − On-vehicle Service − Spark Plug Check And Cleaning . Q: Is the spark plug normal? YES : Refer to INSPECTION PROCEDURE 24 − Ignition Circuit System . NO : Replace the No. 5 cylinder spark plug. Then go to Step 5. STEP 3. Check the compression. − Compression Pressure Check Q: Are there any abnormalities? YES : Replace it. Then go to Step 5. AK700310AB Spark plug |