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Home › Mazda › 2003 › Protege5 Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0117: Engine Coolant Temperature Sensor Circuit - Low Input › Possible Causes

Possible Causes

ECT signal and ground circuits are shorted to each other.
ECT sensor malfunction.
PCM malfunction.
Short circuit between ECT sensor and PCM.