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MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L> 13A-121 CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal 1) • The PCM (terminal 3) controls continuity to the TECHNICAL DESCRIPTION • The PCM checks whether the heater current is DTC SET CONDITIONS Check Conditions • Engine coolant temperature is higher than 20 ° C (68 ° F). • While the heated oxygen sensor (front) heater is • Battery positive voltage is at between 11 and 16 Judgment Criteria • Heater current of the heated oxygen sensor • One monitor during one drive cycle TROUBLESHOOTING HINTS (The most likely • Open or shorted heated oxygen sensor (front) • Open circuit in heated oxygen sensor (front) • PCM failed. DIAGNOSIS Required Special Tools ACX02476 CONNECTOR : B-15 AF HEATED OXYGEN AK000280 CONNECTOR : C-39 PCM AW AK000555AB CONNECTOR : A-21X MFI RELAY |