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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 345 (ENGINE CONTROL SYSTEM - DIAGNOSIS)FUEL PUMP CONTROL CIRCUITINSPECTION PROCEDUREHAND-HELD TESTER
2004 Toyota Celica GT, Standard
Hand-held tester
2004 Toyota Celica GT, StandardSECTION Hand-held tester
WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.
- PERFORM ACTIVE TEST BY HAND-HELD TESTER (OPERATE CIRCUIT OPENING RELAY)
- Connect the hand-held tester to the DLC3.
- Turn the ignition switch to ON and turn the hand-held tester ON.
- Select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
- Check the relay operation while operating it with the hand-held tester.
Standard: Operating sound can be heard from the relay.
OK: Go to step 5
NG: GO TO NEXT STEP.
- INSPECT CIRCUIT OPENING RELAY
- Remove the circuit opening relay from the engine room J/B.
- Check for continuity in the circuit opening relay.
Standard:
RENDER: 1.0x
NO RELATED
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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.