Circuit Description
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Engine Coolant Temperature (ECT) sensor monitors temperature of coolant. This input is used by the Powertrain Control Module (PCM) for engine control and as an enabling criteria for some diagnostics. If engine coolant temperature does not increase normally or does not reach regulating temperature of thermostat, diagnostics that use the ECT as an enabling criteria may not run when expected. DTC P0125 will set if an excessive amount of time passes before engine coolant temperature reaches closed loop operating temperature.