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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE> 13B-233 CIRCUIT OPERATION • A voltage corresponding to the oxygen concen- tration in the exhaust gas is sent to the ECM (ter- • Terminal No. 2 of the right bank heated oxygen sensor (front) is grounded with ECM (terminal • The ECM applies an off set voltage of 0.5 volt to terminal No. 2 of the right bank oxygen sensor . TECHNICAL DESCRIPTION • The right bank heated oxygen sensor (front) detects the concentration of oxygen in the • When the right bank heated oxygen sensor (front) begins to deteriorate, the heated oxygen • The ECM also checks for the right bank heated oxygen sensor (front) rich learn switching fre- . DESCRIPTIONS OF MONITOR METHODS Right bank heated oxygen sensor (front) rich/lean . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Heated oxygen sensor (front) heater monitor • Misfire monitor • Fuel system monitor Sensor (The sensor below is determined to be normal) • Engine coolant temperature sensor • Mass airflow sensor • Intake air temperature sensor • Barometric pressure sensor • Throttle position sensor • Accelerator pedal position sensor . |