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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 258 (Engine Controls Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0125: ECT Excessive Time To Enter Closed-Loop Fuel Control >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

Engine Coolant Temperature (ECT) sensor monitors temperature of the coolant. This input is used by PCM for engine control and as an enabling criteria for some diagnostics.

The airflow 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 increase normally or does not reach regulating temperature of the thermostat, diagnostics that use ECT as enabling criteria, may not run when expected. This DTC will only run once per ignition cycle without the enabling conditions. This DTC will set when there has been excessive time to reach Closed Loop fuel control.

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