DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control: Description
A thermistor is built into the Engine Coolant Temperature (ECT) sensor and changes the resistance value according to the engine coolant temperature.
The structure of the sensor and connection to the ECM is the same as the Intake Air Temperature (IAT) sensor.
HINT:
If the ECM detects the DTC P0115, P0117 or P0118, it operates the fail-safe function in which the ECT is assumed to be 80°C (176°F).
DIAGNOSTIC TROUBLE CODE CHART
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0125 | Engine coolant temperature hardly changes for 2 minutes after engine start (2 trip detection logic) |
|
| P0125 | Engine coolant temperature hardly changes for 5 minutes after engine start (2 trip detection logic) |
|
| P0125 | Engine coolant temperature hardly changes for 20 minutes after engine start (2 trip detection logic) |
|
HINT:
Confirm the ECT using the intelligent tester. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
TEMPERATURE DISPLAYED CHART
| Temperature Displayed | Malfunction |
|---|---|
| -40°C (-40°F) | Open circuit |
| 140°C (284°F) or more | Short circuit |