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 187 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING)COMPUTERIZED ENGINE CONTROLSCRANKING HOLD FUNCTION CIRCUITDIAGNOSIS & REPAIR (WITH HAND-HELD TESTER)
2004 Toyota Celica GT, Standard
Diagnosis & Repair (With Hand-Held Tester)
2004 Toyota Celica GT, StandardSECTION Diagnosis & Repair (With Hand-Held Tester)
WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.
For wiring diagram, see Fig 1. For wire color identification, see WIRE COLOR IDENTIFICATION table. For diagnosis and repair, see Fig 2-Fig 4 .
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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.