P.13A-6 - LIL EVO

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13A-2ENGINE CONTROL RESISTOR, RELAY 13A-782ENGINE CONTROL RESISTOR, RELAY REMOVALAND INSTALLATION . . . . . . . . . . . . . . . . . 13A-782ENGINE CONTROL MODULE (ECM) 13A-783ENGINE CONTROL MODULE (ECM) REMOVAL ANDINSTALLATION. . . . . . . . . . . . . . . . . . . . . . 13A-783SPECIFICATIONS . . . . . . . . . . . . . . . 13A-783FASTENER TIGHTENINGSPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 13A-783GENERAL SPECIFICATIONS . . . . . . . . . . 13A-784SERVICE SPECIFICATIONS . . . . . . . . . . . 13A-784SEALANT AND ADHESIVE . . . . . . . . . . . . 13A-785
.The Multiport Fuel Injection System consists of sensors,actuators and the engine control module(ECM). The sensors detect the engine condition. Themodule controls the system based on signals fromthese sensors. The actuators work under the controlof the ECM. The ECM carries out activities such asfuel injection control, idle air control, and ignition timingcontrol. In addition, the ECM is equipped withseveral diagnostic test modes which simplify troubleshootingwhen a problem develops..FUEL INJECTION CONTROLThe ECM controls injection drive times and injectortiming to supply the optimum air/fuel mixture to theengine according to the continually-changing engineoperation conditions. A single injector is mounted atthe intake port of each cylinder. The fuel pump suppliespressurized fuel from the fuel tank to the fuelinjectors. The fuel pressure regulator controls thefuel pressure. Thus, the regulated fuel is distributedto each injector. Fuel is normally injected for eachcylinder every two rotations of the crankshaft. The firingorder is 1-3-4-2. Each cylinder has a dedicatedfuel injector. This is called "multiport". The ECM providesa richer air/fuel mixture by carrying out "openloop"control when the engine is cold or runningunder high load conditions. Thus, engine performanceis maintained. In addition, when the engine isunder normal operating temperature after warmingup,the ECM controls the air/fuel mixture according tothe heated oxygen sensor signal. This control is a"closed-loop" control. The closed-loop controlachieves the theoretical air/fuel mixture ratio wherethe catalytic converter can obtain the maximumcleaning performance..IDLE AIR CONTROLThe engine control module controls the amount of airthat bypasses the throttle valve according tochanges in idling conditions and engine load duringidling. Thus, idle speed is kept at an optimum speed.The ECM drives the idle air control (IAC) motoraccording to engine coolant temperature, A/C, andother electrical load. Thus, idle speed is kept at anoptimum speed. In addition, when the A/C switch isturned off and on while the engine is idling, the IACmotor adjusts the throttle valve bypass air amount.Thus, idle speed is maintained at constant speedregardless of various engine load conditions..MULTIPORT FUEL INJECTION (MFI)13A-3GENERAL DESCRIPTIONGENERAL DESCRIPTIONTSB RevisionM1131000100615IGNITION TIMING CONTROLThe ignition power transistor located in the ignitionprimary circuit turns on and off to control primary currentflow to the ignition coil. This maintains ignitiontiming at an optimum level regardless of variousengine operating conditions. The ECM determinesthe ignition timing according to engine speed, intakeair volume, engine coolant temperature, and atmosphericpressure..DIAGNOSTIC TEST MODE• When a fault is detected in any of the sensors oractuators related to emission control, the MalfunctionIndicator Lamp (SERVICE ENGINESOON) illuminates to warn the driver.• When a fault is detected in one of the sensors oractuators, a diagnostic trouble code correspondingto the fault is stored in the ECM.• The RAM data inside the ECM that is related tothe sensors and actuators can be read with thescan tool. In addition, the actuators can be controlledby the scan tool MB991502 (MUT-II) orMB991958 (MUT-III sub assembly) under certaincircumstances..OTHER CONTROL FUNCTIONSFuel Pump Control• Turns the fuel pump relay ON so that current issupplied to the fuel pump while the engine iscranking or running.A/C Compressor Clutch Relay Control• Turns the compressor clutch of the A/C ON andOFF.Fan Motor Control• The radiator fan and condenser fan speeds arecontrolled in response to the engine coolant temperatureand vehicle speed.Fuel Pressure Control• Supplies current to fuel pressure solenoid coil toraise the fuel pressure so that the fuel does notvaporize when the engine is started while it iswarm.Intake Charge Pressure Control• Control the intake charge pressure by controllingthe duty of the turbocharger wastegate solenoid.Generator Output Current Control• Prevents generator output current from increasingsuddenly and idle speed from dropping attimes such as when the headlights are turned on.
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P.13A-6 - LIL EVO

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