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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-797 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 EGR 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? STEP 2. Check the following items. a. Check all vacuum hoses and connectors. lems. Q: Are they normal? YES : Go to Step 3. symptom is eliminated. STEP 3. Check the driveability. YES : Go to Step 4. . |