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.
Circuit Description
The purpose of the engine cooling system is to maintain an efficient engine coolant temperature level during all engine operating conditions. The Engine Coolant Temperature (ECT) sensor monitors the temperature of the engine coolant. The PCM uses the ECT sensor input for engine control and enabling criteria for some diagnostics.
For duplication of DTC, ensure:
- DTCs P0105, P0107, P0108, P0112, P0113, P0117, P0118, P0122, P0123, P0130, P0131, P0132, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0301, P0302, P0303, P0304, P0325, P0336, P0420, P0440, P0442, P0446, P0452, P0453, P0480, P0502, P0503, P0506 or P1441 are not set.
- Engine running for greater than 30 seconds, but less than 20 minutes.
- ECT is greater than 95°F (35°C).
- Minimum IAT is greater than 95°F (35°C).
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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.