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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-127 CIRCUIT OPERATION • Power is supplied from the MFI relay (terminal 1) • The ECM (terminal 60) <M/T> or PCM (terminal TECHNICAL DESCRIPTION • The ECM <M/T> or PCM <A/T> checks whether 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) • ECM failed. <M/T> • PCM failed. <A/T> DIAGNOSIS Required Special Tools ACX02476 CONNECTOR : B-17 HEATED OXYGEN AD AK000280 C-49 C-56 ECM<M/T> CONNECTORS:C-56<M/T>,C-50<A/T> BG AK000226 AK000226AB CONNECTOR : A-21X MFI RELAY |