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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-109 STEP 1. Using scan tool MB991502, check data list item 39: CAUTION To prevent damage to scan tool MB991502, always turn the 39, Heated Oxygen Sensor Bank 1, Sensor 1 (right front). • Warming up the engine. When the engine is revved, the • Warming up the engine. When the engine is idling, the (4) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the sensor operating properly? YES : It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ ). NO : Go to Step 2. STEP 2. Check the sensor output voltage at right bank backprobing. • Warming up the engine. When the engine is 2,500 r/min, (4) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the voltage normal? YES : Go to Step 3. STEP 3. Check the sensor output voltage at PCM backprobing. • Warming up the engine. When the engine is 2,500 r/min, (4) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the voltage normal? YES : Go to Step 4. AC003081 AB 16 PIN MB991502 AKX01541 B-33 CONNECTOR 2 4 1 3 AI AKX01533 AKX01533 717273 74 78 7980 818283 8485 86 87 88 89 75 76 77 98 97 96 95 94 93 92 91 90 C-41 CONNECTOR AE |