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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-1005 INSPECTION PROCEDURE 23: 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 likely • Malfunction of air/fuel ratio control system. • Malfunction of the EGR system. • Deteriorated catalyst. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-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? STEP 2. Check the following items. a. Check all vacuum hoses and connectors. lems. c. Check the exhaust system for missing or damaged parts. Q: Are they normal? YES : Go to Step 3. symptom is eliminated. STEP 3. Check the driveability. YES : Go to Step 4. . |