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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSSFI SYSTEMINJECTORON-VEHICLE INSPECTION
2004 Toyota Celica GT, Standard

On-Vehicle Inspection

2004 Toyota Celica GT, StandardSECTION On-Vehicle Inspection
  1. REMOVE NO. 2 CYLINDER HEAD COVER 
    Fig 1: Removing No. 2 Cylinder Head Cover
    G00945158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. CHECK OPERATION SOUND FROM EACH INJECTOR 
    1. Connect the PCV hose to cylinder head cover.
    2. With the engine running or cranking, use a sound scope to check that there is normal operating noise in proportion to engine speed.
    3. If you have no 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.
    Fig 2: Using Sound Scope To Check There Is Normal Operating Noise In Proportion To Engine Speed
    G00945159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
  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.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.