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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-435 . OBD-II DRIVE CYCLE PATTERN . TROUBLESHOOTING HINTS (The most likely • Throttle position sensor failed. • Open or shorted throttle position sensor (sub) cir- cuit, harness damage, or connector damage. • PCM failed. DIAGNOSIS Required Special Tools: • MB991958: Scan tool (MUT-III Sub Assembly) • MB991824: V.C.I. • MB991827: USB Cable • MB991911: Main Harness B • MB991658: Test Harness Set STEP 1. Using scan tool MB991958, check data list item 14: CAUTION To prevent damage to scan tool MB991958, always turn the terminals No. 1, No. 2, No. 3, and No. 4. (6) Set scan tool MB991958 to the data reading mode for item 14, Throttle Position Sensor (sub). • Output voltage should be between 2.2 and 2.8 volts when the throttle valve is fully closed with your finger. • Output voltage should be 4.0 volts or more when the throttle valve is fully open with your finger. (7) Turn the ignition switch to the "LOCK"(OFF) position. YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use NO : Go to Step 2. STEP 2. Check harness connector B-05 at throttle position YES : Go to Step 3. Connector Inspection . Then go to Step 11. AK302970 AB MB991911 MB991824 MB991827 AK201174 1 6 5 4 3 2 B-05(B) CONNECTOR: B-05 HARNESS AB |