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 108 (ENGINE CONTROL SYSTEM SELF DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0116: ENGINE COOLANT TEMPERATURE CIRCUIT RANGE/PERFORMANCE PROBLEMCIRCUIT DESCRIPTION
2004 Toyota Celica GT, Standard
Circuit Description
2004 Toyota Celica GT, StandardSECTION Circuit Description
WARNING: This page is about a different car, the 2003 Toyota Matrix and 2003 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
For circuit description, see DTC P0115: ENGINE COOLANT TEMPERATURE CIRCUIT MALFUNCTION . Detecting conditions of DTC are:
- When engine starts, water temperature is 20°F (-7°C) or less. And 20 minutes or more after engine starts, engine coolant temperature sensor value is 68°F (20°C) or less (2 trip detection logic).
- When engine starts, water temperature is between 20°F (-7°C) and 50°F (10°C). And 5 minutes or more after engine starts, engine coolant temperature sensor value is 68°F (20°C) or less (2 trip detection logic).
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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.