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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-745 STEP 9. Check the positive crankcase ventilation system. Crankcase Ventilation System − Positive Crankcase Ventilation Q: Is the positive crankcase ventilation system? YES : Check the following items, and repair or replace the defective items. a. Vacuum leak. c. Clogged exhaust system. d. Check if fuel is contaminated. f. Check if the foreign materials (water, kerosene, etc.) got into fuel. Then confirm that the malfunction symptom is eliminated. NO : Repair it. Then confirm that the malfunction symptom is eliminated. Inspection procedure 15: Acceleration shock . COMMENT • There may be an ignition leak accompanying the increase in the spark plug demand voltage during . TROUBLESHOOTING HINTS (The most • Malfunction of the ignition system. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (M.U.T.-III Sub Assembly) • MB991824: V.C.I. NOTE: To protect the TC-SST, the TC-SST-ECU outputs, into |