LEMON Manuals
: Even more car manuals for everyone: 1960-2025
Home
>>
Mazda
>>
2003
>>
MX-5 Miata Base, Standard
>>
Repair and Diagnosis
>>
Engine Performance
>>
System
>>
Engine Controls - Self-Diagnostics
>>
Diagnostic Tests
>>
DTC P0118: Engine Coolant Temperature Sensor Circuit High Input
>>
Possible Causes
April 5, 2026:
LEMON Manuals is launched!
Read the announcement.
Possible Causes
ECT sensor malfunction.
Open or short circuit between ECT sensor and PCM.
PCM malfunction.
Poor ECT sensor and PCM connection.