DTC P0125: Engine Coolant Temperature (ECT) Sensor 1 Malfunction/Slow Response: General Description
The engine control module (ECM) supplies voltage to the engine coolant temperature (ECT) signal circuit (about 5 V) through a pull-up resistor. As the engine coolant cools, the ECT sensor 1 resistance increases, and the ECM detects a high signal voltage. As the engine coolant warms, the ECT sensor 1 resistance decreases, and the ECM detects a low signal voltage. If the ECT sensor 1 output voltage does not reach a specified temperature at which closed-loop control for stoichiometric air/ fuel ratio starts within a set time, depending on the initial coolant temperature after starting the engine, the ECM detects a malfunction and a DTC is stored.
MONITOR EXECUTION, SEQUENCE, DURATION, DTC TYPE, OBD STATUS
| Execution | Once per driving cycle |
| Sequence | None |
| Duration | 20 minutes or less |
| DTC Type | Two drive cycles, MIL ON |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
ENABLE CONDITIONS CHART
| Condition | Minimum | Maximum |
|---|---|---|
| Initial engine coolant temperature | - | 0°F (-18°C) |
| Fuel feedback | Other than during fuel cut-off operation | |
| No active DTCs | P0107, P0108, P0111, P0112, P0113, P0117, P0118, P0134, P0135, P0171, P0172, P0300, P0301, P0302, P0303, P0304, P0335, P0339, P0443, P0496, P0506, P0507, P1109, P1128, P1129, P1157, P1172, P2195, P2227, P2228, P2229, P2238, P2252, P2646, P2647, P2648, P2649 | |