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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-538 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 °C (1,742 °F)]. or • Misfire has occurred in 15 or more of the last 1,000 revolutions (corresponding to 1.5 times the or • Misfire has occurred in 10 or more of the last 1,000 revolutions (corresponding to 1.5 times the . OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 . . TROUBLESHOOTING HINTS (The most • Ignition system related part(s) failed. • Low compression pressure. • PCM failed. DIAGNOSIS STEP 1. Check the No. 4 cylinder ignition coil spark. No. 4 cylinder ignition coil. (3) 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. 4 cylinder spark plug. CAUTION Do not attempt to adjust the gap of the iridium plug. Clean- Standard value: 0.7 − 0.8 mm (0.028 − 0.031 inch) Limit: 1.0 mm (0.039 inch) Q: Is the plug gap at the standard value? YES : Refer to, INSPECTION PROCEDURE 31 − Ignition Circuit System NO : Replace the No. 4 cylinder spark plug. Then go to Step 5. AKX00432 SPARK PLUG AB AKX01327AB IRIDIUM PLATINUM |