Circuit Description
WARNING: This page is about a different car, the 2006 Suzuki Verona. However, it is still accessible from the selected car via links, so may be relevant.
The engine coolant temperature gauge is directly controlled by the Engine Control Module (ECM) based on information received from the Engine Coolant Temperature (ECT) sensor. When the key is ON, the ECM receives battery voltage from the Instrument Panel Cluster (IPC) and senses if the circuit contains a fault by using a diagnostic feedback signal.