DTC P0118: Engine Coolant Temperature Sensor Circuit - High Input: Condition
WARNING: This page is about a different car, the 2002 Suzuki XL-7. However, it is still accessible from the selected car via links, so may be relevant.
DTC P0118 is set when ECM detects ECT sensor input voltage is high with engine running for 5 seconds continuously. Engine coolant temperature low and ECT resistance high.