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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-211 • Short-term fuel trim has continued to be higher TROUBLESHOOTING HINTS (The most likely • Volume air flow sensor failed. • Injector (Number 2, 4, 6) failed. • Incorrect fuel pressure • Air drawn in from gaps in gasket, seals, etc. • Left bank heated oxygen sensor failed. • Engine coolant temperature sensor failed. • Intake air temperature sensor failed. • Barometric pressure sensor failed. • Use of incorrect or contaminated fuel. • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools STEP 1. Check the exhaust leaks. Q: Are there any abnormalities? YES : Go to Step 2. STEP 2. Check the intake system vacuum leak. Q: Are there any abnormalities? YES : Go to Step 3. STEP 3. 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 4. − Volume Air Flow Circuit Range/Performance Problem ( ), DTC P0102 − Volume Air Flow Circuit Low Input ( ), DTC P0103 - Volume Air Flow Circuit High Input ( AKX01177 16 PIN MB991502 AB |