Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Legacy 2000-2003 Approved Subaru Legacy 2000 2000 Service Manual MECHANISM AND FUNCTION SECTION Fuel Injection System MSA5TCD00L18169

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MSA5TCD00L18169


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                      LEGACY (W2260BE_SGML Complete)



2-7      [M6A0]                 MECHANISM AND FUNCTION
6. Control System


6. Control System
A: GENERAL
The ECM (Engine Control Module) receives signals sent from various sensors and switches to
judge the engine operating condition and emits output signals to provide the optimum control and/
or functioning of various systems.
Major items governed by the ECM are as follow:
D Fuel injection control
D Ignition system control
D Idle air control
D Canister purge control*
D Radiator fan control
D Fuel pump control
D Air conditioner cut control
D On-board diagnosis function
*: Canister purge control is described under "Chapter 2-1 Emission Control".




                                                26
                LEGACY (W2260BE_SGML Complete)



                                            MECHANISM AND FUNCTION                                              [M6B1]      2-7
                                                                                                              6. Control System


B: INPUT AND OUTPUT SIGNALS
1. MT VEHICLES
                                     Unit                                                 Function
                 Intake manifold pressure sensor         Detects the amount of intake air (Measure the absolute pressure).
                 Intake air temperature sensor           Detects the temperature of intake air.
                 Throttle position sensor                Detects the throttle position.
                                                         Detects the amount of oxygen in exhaust gases at the above of front
                 Front oxygen (A/F) sensor
                                                         catalytic converter.
                                                         Detects the density of oxygen in exhaust gases behind the front cat-
                 Rear oxygen sensors
                                                         alytic converter.
                 Crankshaft position sensor              Detects crankshaft position.
                 Camshaft position sensor                Detects the relative cylinder positions.
                 Engine coolant temperature sensor       Detects the engine coolant temperature.
                 Knock sensor                            Detects engine knocking.
                 Vehicle speed sensor 2                  Detects vehicle speed.
Input
Inp t signal
                 Ignition switch                         Detects ignition switch operation.
                 Starter switch                          Detects the condition of engine cranking.
                 Neutral position switch (MT)            Detects gear position being in the neutral.
                 Heater circuit of front and rear oxy-   Detects the abnormal for heater circuit of front and rear oxygen sen-
                 gen sensor                              sor.
                 A/C switch                              Detects the ON-OFF operation of the A/C switch.
                 Fuel temperature sensor                 Detects the temperature of the fuel in fuel tank.
                 Fuel level sensor                       Detects the level of the fuel in fuel tank.
                 Fuel tank pressure sensor               Detects the evaporation gas pressure in fuel tank.
                 Small light switch                      Detects the ON-OFF operation of the light switch.
                 Blower fan switch                       Detects the ON-OFF operation of the blower fan switch.
                 Rear defogger switch                    Detects the ON-OFF operation of the rear defogger switch.
                 Fuel Injector                           Inject fuel.
                 Ignition signal                         Turns primary ignition current ON or OFF.
                 Fuel pump relay                         Turns the fuel pump relay ON or OFF.
                 A/C control relay                       Turns A/C control relay ON or OFF.
                 Radiator fan control relay              Turns radiator fan control relay ON or OFF.
                 Idle air control solenoid valve         Adjusts the amount of idle air flowing through the throttle valve.
Out ut
Output signal
                 Malfunction indicator lamp              Indicates trouble.
                 Purge control solenoid valve            Controls the purge of evaporative gas absorbed by canister.
                 Power supply                            Control the ON/OFF switching of main relay.
                 Pressure control solenoid valve         Controls the evaporation gas pressure in fuel tank.
                                                         Closes the evaporation line between the fuel tank and canister to
                 Drain valve
                                                         detect the leak of evaporation gases.




                                                             27
                         LEGACY (W2260BE_SGML Complete)



2-7      [M6B2]                        MECHANISM AND FUNCTION
6. Control System


2. AT VEHICLES
                                    Unit                                                 Function
                Intake air temperature and pressure     Detects the temperature of intake and amount of intake air (Measure
                sensor                                  the absolute pressure).
                                                        Detects the amount of intake air (Measure the atmospheric pres-
                Atmospheric pressure sensor
                                                        sure).
                Throttle position sensor                Detects the throttle position.
                                                        Detects the amount of oxygen in exhaust gases at the above of front
                Front oxygen (A/F) sensor
                                                        catalytic converter.
                                                        Detects the density of oxygen in exhaust gases behind the front cat-
                Rear oxygen sensor
                                                        alytic converter.
                Crankshaft position sensor              Detects crankshaft position.
                Camshaft position sensor                Detects the relative cylinder positions.
                Engine coolant temperature sensor       Detects the engine coolant temperature.
                Knock sensor                            Detects engine knocking.
                Vehicle speed sensor 2                  Detects vehicle speed.
Input signal
        g       Ignition switch                         Detects ignition switch operation.
                Starter switch                          Detects the condition of engine cranking.
                Park/Neutral position switch            Detects shift positions.
                Torque control signal                   Controls the engine torque.
                Heater circuit of front and rear oxy-   Detects the abnormal for heater circuit of front and rear oxygen sen-
                gen sensor                              sor.
                Diagnostics of AT                       Detects the self-diagnostics of AT.
                A/C switch                              Detects the ON-OFF operation of the A/C switch.
                Fuel temperature sensor                 Detects the temperature of the fuel in fuel tank.
                Fuel level sensor                       Detects the level of the fuel in fuel tank.
                Fuel tank pressure sensor               Detects the evaporation gas pressure in fuel tank.
                Small light switch                      Detects the ON-OFF operation of the light switch.
                Blower fan switch                       Detects the ON-OFF operation of the blower fan switch.
                Rear defogger switch                    Detects the ON-OFF operation of the rear defogger switch.
                Fuel Injector                           Inject fuel.
                Ignition signal                         Turns primary ignition current ON or OFF.
                Fuel pump relay                         Turns the fuel pump relay ON or OFF.
                A/C control relay                       Turns A/C control relay ON or OFF.
                Radiator fan control relay              Turns radiator fan control relay ON or OFF.
                Idle air control solenoid valve         Adjusts the amount of idle air flowing through the throttle valve.
Out ut
Output signal
                Malfunction indicator lamp              Indicates trouble.
                Purge control solenoid valve            Controls the purge of evaporative gas absorbed by canister.
                Power supply                            Control the ON/OFF switching of main relay.
                Pressure control solenoid valve         Controls the evaporation gas pressure in fuel tank.
                                                        Closes the evaporation line between the fuel tank and canister to
                Drain valve
                                                        detect the leak of evaporation gases.




                                                            28
              LEGACY (W2260BE_SGML Complete)



                                MECHANISM AND FUNCTION                                    [M6C1]      2-7
                                                                                        6. Control System


C: FUEL INJECTION CONTROL
D The ECM receives signals emitted from various sensors to control the amount of fuel injected
and the fuel injection timing. Sequential fuel injection control is utilized over the entire engine oper-
ating range except during engine starts.
D The amount of fuel injected by the injector valve is dependent upon the length of time it remains
open. The optimum fuel injection timing is determined by transmitting a signal to the injector from
the ECM according to varying engine operations. Feedback control is also accomplished by
means of a learning control. As a result, the fuel injection control system is highly responsive and
accurate in design and structure.
D The sequential fuel injection system is designed so that fuel is injected at a specific time to pro-
vide maximum air intake efficiency for each cylinder. In other words, fuel injection is completed
just before the intake valve begins to open.

1. FUEL INJECTION CHARACTERISTICS
Fuel injection timing is basically expressed as indicated below:
D During engine starts:
Duration of fuel injection = Duration of fuel injection during engine starts
D During normal operation:
Basic duration of fuel injection x correction factors + voltage correction time
  D Basic duration of fuel injection ..... The basic length of time fuel is injected. This is determined
  by two factors 



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