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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-409 STEP 3. Using scan tool MB991958, check data list item 2: CAUTION To prevent damage to scan tool MB991958, always turn the 2, Crankshaft Position Sensor. (4) Check the waveform of the crankshaft position sensor while keeping the engine speed constant. • The pulse width should be constant. Q: Is the sensor operating properly? YES : Go to Step 4. − Crankshaft Position Sensor Circuit STEP 4. Using scan tool MB991958, check data list item 26 26<bank 1> and 27 <bank2>, Long-Term Fuel Trim. • The fuel trim should be between −12.5 and +12.5 per- cent when the engine is 2,500 r/min (during closed loop) Q: Is the specification normal? YES : Go to Step 5. − System too Lean (bank 1) , DTC P0172 − System too Rich (bank 1) , DTC P0174 − System too Lean (bank 2) , DTC P0175 − System too Rich (bank 2) . AK700568AB MB991824 MB991827 MB991910 Data link |