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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE> 13B-409 STEP 11. Check the trouble symptoms. (1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function − OBD-II Drive Cycle − Procedure 6 − Other Monitor (2) Check the diagnostic trouble code (DTC). YES : Replace the PCM. Then go to Step 12. Refer to GROUP 00, How to Use STEP 12. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Procedure 6 − Other Monitor (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. DTC P0171: System too Lean (bank 1) CAUTION If DTC P0171 has been set, TCL related DTC . Fuel Trim Circuit • Refer to DTC P0201− Injector Circuit − Cylinder 1 − Injector Circuit − Cylinder 3 − Injector Circuit − Cylinder 5. . CIRCUIT OPERATION • Refer to DTC P0201 P0203 , P0205 − Injector Circuit. . TECHNICAL DESCRIPTION • If a malfunction occurs in the fuel system, the fuel trim value becomes too large. • The PCM checks whether the fuel trim value is within a specified range. . DESCRIPTIONS OF MONITOR METHODS and air/fuel feedback integral value (short time . MONITOR EXECUTION . MONITOR EXECUTION CONDITIONS (Other Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Misfire monitor Sensor (The sensor below is determined to be normal) • Mass airflow sensor • Engine coolant temperature sensor • Intake air temperature sensor • Barometric pressure sensor • Throttle position sensor . |