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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-381 • Adaptive learning is complete for the vane which generates a crankshaft position signal. • While the engine is running, excluding rough road driving <M/T>, sudden acceleration/deceleration Judgement Criteria (change in the angular accel- eration of the crankshaft is used for misfire • Misfire has occurred more frequently than allowed during the last 200 revolutions [when the (1,832° F)]. or • Misfire has occurred in 2.0 percent or more of the last 1,000 revolutions (corresponding to 1.5 times . FAIL-SAFE AND BACKUP FUNCTION • The supply of fuel to the misfiring cylinder can possibly be cut. . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Pattern 14 . . TROUBLESHOOTING HINTS (The most • Ignition system related part(s) failed. DIAGNOSIS STEP 1. Visual check on ignition spark of No. 4 cylinder. YES : Go to Step 3. STEP 2. Check the No. 4 cylinder spark plug. Spark Plug Check And Cleaning . Q: Is the spark plug normal? YES : Refer to, Symptom Procedures 26 − Ignition Circuit System NO : Replace the No. 4 cylinder spark plug. Then go to Step 5. STEP 3. Check the compression. . Q: Are there any abnormalities? YES : Repair or replace it. Then go to Step 5. AK704268 AB Spark plug |