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TROUBLESHOOTING MULTIPORT FUEL INJECTION (MPI) <4A9> 13A-18 FAIL-SAFE FUNCTION REFERENCE TABLE When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by Malfunctioning item Control contents during malfunction Intake air temperature Controls as if the intake air temperature is 25 °C. Barometric pressure Controls as if the barometric pressure is 101 kPa. Throttle position sensor • Controls the throttle valve position through the use of the throttle position sensor (sub) signal. • Renders the amount of accelerator pedal travel as being approximately one-half the normal opening angle. • Prohibits the operation of the engine speed feedback control. • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the throttle position sensor (sub) is also malfunctioning. Throttle position sensor • Controls the throttle valve position through the use of the throttle position sensor (main) signal. • Renders the amount of accelerator pedal travel as being approximately one-half the normal opening angle. • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the throttle position sensor (main) is also malfunctioning. 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 • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronic-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 being • Cuts off fuel when the engine speed exceeds 3,000 r/min. • Suppresses the engine output by stopping the electronic-controlled throttle valve system if the accelerator pedal position sensor (main) is also Engine coolant Controls as if the engine coolant temperature is 80 °C. (This control will be continued until the ignition switch is turned to the "LOCK" (OFF) position even Camshaft position Injects fuel into the cylinders in the order 1-3-4-2 with irregular timing. (After the Oxygen sensor <front> Air/fuel ratio closed loop control is not performed. oxygen sensor (front) installed on the front side of the catalytic converter. Detonation sensor The ignition timing is set having enough time against knocking. Main Index Group TOC |