FUEL SYSTEM


  1. CONSTRUCTION


    1. A solenoid type injector is used to precisely control the fuel injection volume and timing.*1

    2. This injector mainly consists of the solenoid valve, nozzle needle, valve bolt, and piston.*1

    3. A piezo type injector is used to precisely control the fuel injection volume and timing.*2

    4. This injector mainly consists of the piezo actuator, nozzle needle, valve bolt, amplifier piston and valve piston.*2

      *1: Except destination package for Turkey sedan models

      *2: Destination package for Turkey sedan models

    5. An injector compensation value and Data Matrix Code (DMC) containing encoded characteristics of the injector are printed on each injector.

    6. The injector compensation value and DMC contains various pieces of information regarding the injector, such as model code, and injection volume correction.

      Figure 1. Except Destination Package for Turkey Sedan Models

      A01KVUJC01
      *1 Solenoid *2 Piston
      *3 Nozzle Needle - -
      *a Injector Compensation Value *b DMC

      Figure 2. Destination Package for Turkey Sedan Models

      A01KVA6C03
      *1 Amplifier Piston *2 Valve Bolt
      *3 Nozzle Needle *4 Piezo Actuator
      *5 Valve Piston - -
      *a Injector Compensation Value *b DMC

      Tech Tips


      • If an injector or the ECM is replaced, the injector compensation value can be entered in the ECM via the Global TechStream (GTS).


        • When an injector is replaced, enter the injector compensation value of the replaced injector only.


        • When the ECM is replaced, enter the injector compensation value of all injectors. The proper compensation will be made so that the injection volume precision prior to the replacement will remain unchanged.

      • The DMC, which requires a special scan tool, is not used at Toyota dealers.

  2. OPERATION


    1. Except Destination Package for Turkey Sedan Models


      1. When electrical current is applied to the solenoid coil, it pulls the solenoid valve up.

      2. The orifice of the control chamber opens, allowing the fuel to flow out.

      3. The fuel pressure in the control chamber drops.

      4. Simultaneously, fuel flows from the orifice to the bottom of the piston and raises the piston up (to enhance response).

      5. As a result, the piston raises the nozzle needle to inject fuel.

        A01KVHQC01
        *1 Solenoid Coil *2 Solenoid Valve
        *3 Control Chamber *4 Piston
        *5 Nozzle Needle - -
        *a Fuel - -

    2. Destination Package for Turkey Sedan Models


      1. Injector: Needle Opening (During Injection)


        1. The actuator is activated.

        2. The valve bolt opens (moves downwards) due to actuator lift.

        3. Pressure of the nozzle needle tip decreases.

        4. The nozzle needle opens (moves upwards).The actuator is activated.

      2. Injector: Needle Closing (While Stopped)


        1. The actuator is deactivated.

        2. The valve bolt closes (moves upwards) due to the valve spring.

        3. Pressure of the nozzle needle tip increases.

        4. The nozzle needle closes (moves downwards).

        A01KVOBC01
        *1 Piezo Actuator *2 Amplifier Piston
        *3 Valve Piston *4 Valve Bolt
        *5 Nozzle Needle *6 Fuel
        *a During Injection *b While Stopped