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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (ENGINE CONTROLS [SELF-DIAGNOSTICS 2.3L])DIAGNOSTIC TESTSDTC P0117: ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT - LOW INPUTPOSSIBLE CAUSES
2010 Mazda 5 Sport, 2.3 L, Standard
Possible Causes
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Possible Causes
WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
Possible causes are:
- Connector or terminal malfunction
- ECT sensor malfunction
- PCM malfunction
- Short between ECT signal circuit (Light Green/Black wire) and ECT ground circuit (Brown wire) in wire harness
- Short to ground circuit between ECT sensor harness connector terminal "A" and PCM 30-pin harness connector terminal "1M" (Light Green/Black wire)
RENDER: 1.0x
NO RELATED
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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.