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MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System) TSB Revision MULTIPORT FUEL SYSTEM (MFI) 13A-41 List of main compensations for throttle valve opening angle and idle speed control Initialize control After ignition switch turns OFF, ECM drives the throt- tle valve from fully closed position to fully open posi- tion and records the fully closed/open studied value of the throttle position sensor (main and sub) output signals. The recorded studied values are used as studied value compensation for compensating basic target opening angle when the engine is started next. MIVEC (Mitsubishi Innovative Valve Timing Electronic Control System) M2132023500405 MIVEC is a control system continuously varying the intake valve timing and exhaust valve timing. The opening and closing period of the valve does not change. MIVEC allows the optimum valve timing to be con- trolled in accordance with the engine operation and the idling stability to be improved, as well as the out- put and the torque to be better in all the operation ranges. Compensations Content Stable idle compensation (immediately after start) In order to stabilize idle speed immediately after start, target opening angle is kept big and then gradually reduced. Compensation values are set based on the engine coolant temperature. Engine speed feedback compensation (while idling) In case there is a difference between the target idle speed and actual engine speed, ECM compensates the throttle valve opening angle based on that difference. Barometric pressure compensation At high altitudes barometric pressure is less and the intake air density is low. So, the target opening angle is compensated based on barometric pressure. Engine coolant temperature compensation Compensation is made according to the engine coolant temperature. The lower the engine coolant temperature the greater the throttle valve opening angle. Electric load compensation Throttle valve opening angle is compensated according to electric load. The greater the electric load, the greater the throttle valve opening angle. Compensation when shift is in D range <TC-SST> When shift lever is changed from P or N range to some other range, throttle valve opening angle is increased to prevent reduction in engine speed. Compensation when A/C is functioning Throttle valve opening angle is compensated according to functioning of A/C compressor. While A/C compressor is being driven, the throttle valve opening angle is increased. Power steering pressure compensation Throttle valve opening angle is compensated according to power steering functioning. When power steering pressure rises and power steering pressure switch is ON, the throttle valve opening angle is increased. |