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 139 (CRUISE CONTROL SYSTEMS)SELF-DIAGNOSTIC SYSTEMCRUISE CONTROL INPUT SIGNAL CHECK
2004 Toyota Celica GT, Standard
Cruise Control Input Signal Check
2004 Toyota Celica GT, StandardSECTION Cruise Control Input Signal Check
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.
NOTE:
Perform BASIC INSPECTION BEFORE performing this check. Cruise control input signal check should only be performed if no diagnostic trouble codes are present.
- Cruise control input signal check is used to determine if major input circuits are functioning properly when no trouble codes are present. To perform input signal check, turn ignition switch on.
- Push and hold SET/COAST or RES/ACC switch on cruise control switch. Press cruise control switch to ON position. Ensure CRUISE indicator light on instrument cluster flashes 2 or 3 times repeatedly after 3 seconds to confirm that input signal check mode has been entered. Release SET/COAST or RES/ACC switch on cruise control switch.
- Perform operation method in order given in illustration. See Fig 1. For STEPS 1-3 of Cruise Control Input Signal Check, ignition switch needs to be in ON position. For STEP 4 of Cruise Control Input Signal Check, front of vehicle must be safely supported on jack stands to allow drive wheels to rotate with transaxle in Drive.
- Verify normal code is displayed by CRUISE indicator light as each circuit is activated. Normal codes are single-digit codes for each operation. See Fig 1. If a normal code is not received during testing, that circuit is probably faulty. Proceed to diagnose fault by symptom. See SYMPTOM INDEX table under SYSTEM TESTS.
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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.