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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L> 13B-209 • Intake air temperature is higher than -10 ° C (14 ° F). • Barometric pressure is higher than 76kPa (11 • Volume air flow sensor output frequency is 100 Judgment Criteria • Long-term fuel trim has continued to be lower or • Short-term fuel trim has continued to be lower Check Area • Under the closed loop air/fuel ratio control. • The left bank heated oxygen sensor (front) is Judgment Criteria • Long-term fuel trim has continued to be lower or • Short-term fuel trim has continued to be lower TROUBLESHOOTING HINTS (The most likely • Volume air flow sensor failed. • Injector (Number 2, 4, 6) failed. • Incorrect fuel pressure • Left bank heated oxygen sensor failed. • Engine coolant temperature sensor failed. • Intake air temperature sensor failed. • Barometric pressure sensor failed. • Exhaust leak. • Use of incorrect or contaminated fuel. • PCM failed. DIAGNOSIS Required Special Tools STEP 1. Using scan tool MB991502, check data list item 12: CAUTION To prevent damage to scan tool MB991502, always turn the 12, Volume Air Flow Sensor. (4) Warm up the engine to normal operating temperature: 80 °
C to 96 ° C (176 ° F to 205 ° F). • When idling, between 17 and 46 Hz (between 2.2 and • When 2,500 r/min, between 63 and 103 Hz (between (5) Turn the ignition switch to the "LOCK"(OFF) position. Q: Is the sensor operating properly? YES : Go to Step 2. − Volume Air Flow Circuit Range/Performance Problem( ), DTC P0102 − Volume Air Flow Circuit Low Input( ), DTC P0103 - Volume Air Flow Circuit High Input( AC003081 AB 16 PIN MB991502 |