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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-273 STEP 13. Replace the injector. Diagnostic Function − OBD-II Drive Cycle − Pattern 21 (3) Check the diagnostic trouble code (DTC). YES : Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> NO : The inspection is complete. STEP 14. Test the OBD-II drive cycle. Diagnostic Function − OBD-II Drive Cycle − Pattern 21 (2) Check the diagnostic trouble code (DTC). YES : Retry the troubleshooting. DTC P0172: System too Rich . Fuel Trim Circuit • Refer to DTC P0201 − Injector Circuit-Cylinder 1 , DTC P0202 − Injector Circuit-Cylinder , DTC P0203 − Injector Circuit-Cylin- , DTC P0204 − Injector Cir- cuit-Cylinder 4 . CIRCUIT OPERATION • Refer to DTC P0201 − Injector Circuit-Cylinder 1 , DTC P0202 − Injector Circuit-Cylinder , DTC P0203 − Injector Circuit-Cylin- , DTC P0204 − Injector Cir- cuit-Cylinder 4 . TECHNICAL DESCRIPTION • If a malfunction occurs in the fuel system, the fuel trim value becomes too small. • The ECM checks whether the fuel trim value is within a specified range. . DESCRIPTIONS OF MONITOR METHODS Air/fuel learning value (long time fuel trim) and air/fuel feedback integral value (short time fuel . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS 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 . |