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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-129 STEP 1. Using scan tool MB991502, check data list item 59: CAUTION To prevent damage to scan tool MB991502, always turn the 59, Heated Oxygen Sensor (rear). • Warming up the engine. When the engine is revved, 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 heated oxygen backprobing. • Warming up the engine. When the engine is revved, the (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 AK000291 C-19 CONNECTOR 1 2 3 4 5 6 AC AK000293 C-41 CONNECTOR 71 72 73 91 74 75 92 76 77 82 83 84 85 86 AC |