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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-767 STEP 9. Check the positive crankcase ventilation system. − Positive Crankcase Ventilation System − Positive Crankcase Ventilation System Check . Q: Is the positive crankcase ventilation system? YES : Go to Step 10. is eliminated. STEP 10. Check the evaporative emission control system. − Evaporative Emission Control System − Purge Control System Check (Purge Flow Check) Q: Is the purge control system normal? YES : Check the following items, and repair or replace the defective items. a. Check if the injectors are clogged. Then confirm that the malfunction symptom is eliminated. NO : Repair it. Then confirm that the malfunction symptom is eliminated. Inspection procedure 18: Transient, mass emission tailpipe test failure . COMMENT • The test is failed when the air/fuel ratio is not con- trolled to the ideal air/fuel ratio. This occurs due NOTE: If the three-way catalyst temperature is low . TROUBLESHOOTING HINTS (The most • Malfunction of air/fuel ratio control system. • Malfunction of the fuel pump system. • Malfunction of the ignition system. • Poor compression. • Malfunction of the EGR system. • Improper operation of the PCV valve • Malfunction of the evaporative emission control system • Deteriorated catalyst. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991910: Main Harness A STEP 1. Check the exhaust gas with the engine at normal sufficiently? |