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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-259 . CIRCUIT OPERATION • A voltage corresponding to the oxygen concen- tration in the exhaust gas is sent to the ECM (ter- • Terminal No. 4 of the heated oxygen sensor (rear) is grounded with ECM (terminal No. 41). • The ECM applies an offset voltage of 0.5 volt to terminal No. 4 of the heated oxygen sensor . TECHNICAL DESCRIPTION • The output signal of the linear air-fuel ratio sensor is compensated by the output signal of the • The ECM checks for the heated oxygen sensor (rear) output voltage. . DESCRIPTIONS OF MONITOR METHODS Heated oxygen sensor (rear) output voltage does not change during specified go/stop operations . MONITOR EXECUTION Continuous . MONITOR EXECUTION CONDITIONS Other Monitor (There is no temporary DTC stored in memory for the item monitored below) • Linear air-fuel ratio sensor monitor • Linear air-fuel ratio sensor heater monitor • Heated oxygen sensor (rear) heater monitor • Heated oxygen sensor offset voltage monitor Sensor (The sensor below is determined to be normal) • Mass airflow sensor • Engine coolant temperature sensor • Intake air temperature sensor • Barometric pressure sensor . AK900665 D-37 (B) Rear heater duct (RH) Heated oxygen AB Connector: D-37 |