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2003
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MX-5 Miata Base, Automatic
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Engine Performance
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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
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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.