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Mazda
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2003
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MX-5 Miata Base, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P0117: Engine Coolant Temperature Sensor Circuit Low Input
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Possible Causes
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Possible Causes
ECT sensor malfunction.
ECT signal and GND circuit short to each other.
PCM malfunction.
Short to ground between ECT sensor and PCM harness connectors.