FUEL SYSTEM


  1. CONSTRUCTION


    1. Each injector assembly consists of a nozzle needle, a piston, and a solenoid valve.

    2. An injector compensation value and a Quick Response (QR) code containing encoded characteristics of the injector are printed on each injector assembly.

    3. The injector compensation value and QR code contain various pieces of information regarding the injector, such as model code and injection volume correction.

      B002NC2C02
      *1 Injector Assembly *2 Solenoid Valve
      *3 Piston *4 Nozzle Needle
      *5 QR Code *6 Injector Compensation Value

      Tech Tips


      • If the ECM is replaced, use the Global TechStream (GTS) and input the injector compensation values of all 4 injectors. If the injector is replaced, input the injector compensation value of the replaced injector. Then, the proper compensation will be made so that the injection volume precision prior to the replacement will remain unchanged. For details, refer to the Repair Manual.

      • The QR code, which requires a special scan tool, is not used at TOYOTA dealers.

      • What is Quick Response (QR) Code?


        • QR code, a matrix symbology consisting of an array of nominally square cells, allows omni-directional, high-speed reading of large amounts of data.

        • QR code encodes many types of date such as numeric, alphanumeric, kanji, kana and binary code. A maximum of 7089 characters (numeric) can be encoded.

        • QR code (2D code) contains information in the vertical and horizontal directions, whereas a bar code contains data in one direction only. QR code (2D code) holds a considerably greater volume of information than a bar code.

  2. OPERATION


    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.

      B002NPLC02
      *1 Injector Assembly *2 Solenoid Coil
      *3 Solenoid Valve *4 Piston
      *5 Nozzle Needle - -
      *a Fuel from Common-rail Assembly *b Return Fuel