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Home >> Toyota >> 2004 >> ECHO 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> SFI System >> Injector >> On-Vehicle Inspection

On-Vehicle Inspection

  1. REMOVE NO.2 CYLINDER HEAD COVER 
    Fig 1: Using Sound Scope & Checking Operating Noise
    G02906165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK OPERATION SOUND FROM EACH INJECTOR 
    1. Connect the PCV hose to the cylinder head cover.
    2. With the engine running or cranking, use a sound scope to check that the operating noise is normal in proportion to engine speed.
    3. If you do not have a sound scope, you can check the injector transmission operation with your finger.

      If no sound or unusual sound is heard, check the wiring connector, injector signal from the ECM.

    4. Disconnect the PCV hose from cylinder head cover.
  3. INSPECT INJECTOR RESISTANCE 
    1. Disconnect the injector connector.
    2. Using an ohmmeter, measure the resistance between the terminals.

      Resistance: 

      13.4 - 14.2 Ω at 20 °C (68 °F) 

      If the resistance is not as specified, replace the injector.

    3. Reconnect the injector connector.
      Fig 2: Inspecting Injector Resistance
      G02906166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSTALL WIRE HARNESS PROTECTOR COVER 
    1. Install the wire harness protector cover with bolt and 2 nuts.
    2. Connect the PCV hose to cylinder head cover.
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