DTC P0118: Engine Coolant Temperature (ECT) Sensor Circuit, High Input: 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 voltage from ECT sensor is more than 4.8 volts. This is a continuous monitor. MIL is illuminated when PCM detects malfunction during 2 consecutive drive cycles. Possible causes are:
- ECT sensor malfunction.
- Open or Short circuit between ECT sensor and PCM.
- PCM malfunction.