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MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS TSB Revision MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE> 13A-47 FAIL-SAFE FUNCTION REFERENCE TABLE M1131153001010 When the main sensor malfunctions are detected by MALFUNCTION ITEM CONTROL CONTENTS DURING MALFUNCTION Mass airflow sensor Uses the throttle position sensor signal and engine speed signal (crankshaft Intake air temperature Controls as if the intake air temperature is 25 °C (77°F). Engine coolant Controls as if the engine coolant temperature is 80 °C (176°F). (This control will be continued until the ignition switch is turned to "LOCK" (OFF) position even Intake camshaft position • Engine runs in learned pattern until engine stops. • Does not control variable valve timing (V.V.T.). Exhaust camshaft Does not control variable valve timing (V.V.T.). Barometric pressure Controls as if the barometric pressure is 101 kPa (30 in.Hg). Knock sensor Switches the ignition timing from ignition timing for high octane to ignition timing Linear air-fuel ratio • Does not control air-fuel ratio closed loop. • Controls linear air-fuel ratio sensor heater off. Heated oxygen sensor Performs the closed loop control of the air/fuel ratio by using only the signal of Generator FR terminal No generator output suppression control is performed for the electrical load (to Misfire detection The ECM stops supplying fuel to the cylinder with the highest misfire rate if a Accelerator pedal • Detects the amount of the accelerator pedal travel through the use of the accelerator pedal position sensor (sub) signal, but rendering it only as being • Prohibits the operation of the auto-cruise control. • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronically controlled throttle valve system if the accelerator pedal position sensor (sub) is also Accelerator pedal • Detects the amount of the accelerator pedal travel through the use of the accelerator pedal position sensor (main) signal, but rendering it only as • Prohibits the operation of the auto-cruise control. • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronically controlled throttle valve system if the accelerator pedal position sensor (main) is also |