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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-167 • Under the closed loop air/fuel control. • Monitoring time: 30seconds. Judgment Criteria • Multiport fuel injection system does not enter the TROUBLESHOOTING HINTS (The most likely • Left bank heated oxygen sensor (front) • Open circuit in left bank heated oxygen sensor • Open circuit in left bank heated oxygen sensor • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools STEP 1. Check the exhaust leaks. Q: Are there any abnormalities? YES : Go to Step 2. STEP 2. Check the intake system vacuum leak. Q: Are there any abnormalities? YES : Go to Step 3. STEP 3. Check connector B-24 at the left bank heated YES : Go to Step 4. Connector Inspection ( AK000212AB AK000212 CONNECTOR : B-24 |