Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSSFI SYSTEMFUEL PUMPON-VEHICLE INSPECTION

2004 Toyota Celica GT, Standard

On-Vehicle Inspection

2004 Toyota Celica GT, StandardSECTION On-Vehicle Inspection

CHECK FUEL PUMP OPERATION
1. Connect the TOYOTA hand-held tester to the DLC3.
2. Turn the ignition switch ON and TOYOTA hand-held tester main switch ON.
  NOTE: Do not start the engine.
3. Select the active test mode on the TOYOTA hand-held tester.
4. Please refer to the TOYOTA hand-held tester operators manual for further details.
  
  Fig 1: Connecting TOYOTA Hand Held Tester To DLC 3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. If you have no TOYOTA hand-held tester, connect the positive (+) lead from the battery to terminal 4 of the connector, and the negative (-) lead to terminal 5.
  
  Fig 2: Connecting Positive (+) Lead From Battery To Terminal 4 Of Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Check that there is pressure in the fuel inlet pipe from the fuel line.
  HINT:
  
  If there is fuel pressure, you will hear the sound if fuel following. If there is no pressure, check these parts, Fusible link, Fuses, EFI Main relay, Fuel pump, ECM, and Witting connector.
7. Turn the ignition switch to LOCK.
8. Disconnect the TOYOTA hand-held tester from the DLC3.
Fig 3: Checking Pressure In Fuel Inlet Pipe From Fuel Line
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
CHECK FUEL PRESSURE
1. Check the battery positive voltage is above 12 V.
  
  Fig 4: Checking Battery Positive Voltage Is Above 12 V
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the negative (-) terminal cable from the battery.
3. Purchase the new fuel tube and take out the fuel tub connector from its pipe.
  Part No.:
  - 1ZZ-FE: 23901-22100
  - 2ZZ-GE: 23271-88600
4. Remove the fuel pipe clamp.
  
  Fig 5: Disconnecting Negative (-) Terminal Cable From Battery
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect the fuel tube (fuel tube connector) from the fuel pipe.
  CAUTION:
  - Perform disconnecting operations of the fuel tube connector (quick type) after observing the precautions.
  - As there is retained pressure in the fuel pipe line, prevent if from splashing inside the engine comportment.

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.