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 133 (CRUISE CONTROL SYSTEMS)SYSTEM TESTSCRUISE MAIN INDICATOR LIGHT CIRCUITDIAGNOSTIC PROCEDURE
2004 Toyota Celica GT, Standard
Diagnostic Procedure
2004 Toyota Celica GT, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2003 Lexus ES 300 and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
For circuit wiring diagram, see Fig 1.
- Connect the hand-held tester to the DLC3. See Figure. Turn the ignition switch ON and push the hand-held tester main switch ON. Select the item CCS INDICATOR in the DATA LIST and read it's value displayed on the hand-held tester. Read the value of the hand-held tester. If the results are OK (ON: CCS READY On, OFF: CCS READY Off), proceed to the next circuit inspection shown in the problem symptom table. See CRUISE CONTROL PROBLEM SYMPTOMS table. If the results are not good, go to the next step.
- Inspect the combination meter assembly. See Fig 2. If the combination meter assembly operation is OK, go to the next step. If the operation is not good, check and replace the combination meter assembly. See appropriate INSTRUMENT PANELS article.
- Check the harness and connector. Check for an open and short circuit in the harness and connector between P1 of the ECM and combination meter. Check for an open and short circuit in the harness and connector between the combination meter and battery. If the results are OK, check and replace the ECM. If the results are not good, repair or replace the harness or connector.
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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.