Enhanced Testing

P0125 - Insufficient Coolant Temperature for Closed Loop Fuel Control







General Description
An Engine Coolant Temperature Sensor (ECTS) monitors the temperature of the coolant. This input is used by the ECM for engine control and as an enabling criteria for same diagnostics. The air flow coming into the engine is accumulated and used to determine if the engine has been driven within conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not reach regulating temperature of the thermostat, diagnostics that use the engine coolant temperature as enabling criteria may not run when expected.

DTC Description
If the coolant temperature does not reach the specified value within the established time parameters, the ECM determines that a malfunction exists and a DTC is stored.

Detecting Condition and Specifications





Wiring Schematic





Signal Waveform