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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) 13A-477 . CIRCUIT OPERATION • The ECM (terminal No. 114) supplies a 5 volts reference voltage to the fuel tank differential pres- • The ECM (terminal No. 112) receives a voltage signal proportional to the pressure in the fuel tank . TECHNICAL DESCRIPTION • To determine whether the fuel tank differential pressure sensor is defective, the ECM monitors • The ECM judges if the fuel tank differential pres- sure sensor output voltage is normal. NOTE: In rare cases, this DTC may be also set . DESCRIPTIONS OF MONITOR METHODS Fuel tank differential pressure sensor output voltage . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Evaporative emission purge solenoid monitor Sensor (The sensors below are determined to be normal) • Mass airflow sensor . |