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 146 (ENGINE IMMOBILIZER SYSTEMS)
2004 Toyota Celica GT, Standard
Section 146 (Engine Immobilizer Systems)
2004 Toyota Celica GT, StandardSECTION Section 146 (Engine Immobilizer Systems)
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
- Description
- Operation
- Component Locations
- Programming
- Trouble Shooting
- Connector Identification
- Self-Diagnostic System
- Diagnostic Tests
- System Tests
- Notes
- Test No. 1: Engine Immobilizer Is Not Set (Engine Starts With Ignition Key Code Other Than The Registered Ignition Key Code)
- Test No. 2: Engine Does Not Start
- Test No. 3: Security Indicator Light Is Always On
- Test No. 4: Security Indicator Light Is Always On Although Ignition Key Code Has Been Registered In Automatic Registration Mode
- Test No. 5: Security Indicator Light Is Off When Engine Immobilizer DTC Is Output
- Test No. 6: Security Indicator Light Is Off When Engine Immobilizer DTC Is Not Output
- Test No. 7: Security Indicator Light Is Flashing Abnormally
- Confirmation Test
- Component Tests
- Pin Voltage Tests
- Removal & Installation
- Wiring Diagrams
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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.