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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-757 STEP 3. Using scan tool MB991958, check data list. CAUTION To prevent damage to scan tool MB991958, always turn the Reference Table a. Item 21: Engine Coolant Temperature Sensor. (4) Turn the ignition switch to the "LOCK" (OFF) position. YES : Go to Step 4. symptom is eliminated. STEP 4. Adjust the basic idle speed. − Basic Idle Speed Adjustment for the adjustment procedure Standard value: 700 ± 50 r/min Q: Is the idle speed normal? YES : Carry out the following cleaning or adjustment. a. Refer to On-vehicle Service − Clean the throttle valve area NO : The check is completed. INSPECTION PROCEDURE 11: When the engine is cold, it stalls at idle (die out). . COMMENT • In such cases as the above, the air/fuel mixture may be inappropriate when the engine is cold. . TROUBLESHOOTING HINTS (The most likely • Malfunction of the IAC system. • Malfunction of the throttle body. • Malfunction of the injector system. • Malfunction of the ignition system. DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: V.C.I • MB991827: USB Cable • MB991911: Main Harness B AK303629AB MB991911 MB991827 MB991824 16-PIN |