DTC P0116: ECT Sensor Circuit Performance Problem: Condition
WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.
DTC is set when Powertrain Control Module (PCM) detects input from Engine Coolant Temperature (ECT) sensor is less than 50°F (10°C), after vehicle has hot soaked for at least 6 hours, engine coolant temperature is 230°F (110°C) and vehicle speed is more than 15 MPH. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- ECT sensor malfunction.
- Poor ECT sensor or PCM connector connection.
- PCM malfunction.