P0125-INSUFFICIENT COOLANT TEMP FOR CLOSED-LOOP FUEL CONTROL
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on, battery voltage greater than 10.4 volts, and no ECT sensor circuit DTCs present.
- Set Condition:
The PCM detects that the engine coolant temperature is below the calibrated pass value when the engine run time is greater than the calibrated value based on start up coolant temperature. Two trip fault. Three good trips to turn off the MIL.
| Possible Causes |
| ENGINE COOLANT TEMPERATURE SENSOR WIRING OR CONNECTORS |
| ENGINE COOLANT LEVEL AND CONDITION |
| THERMOSTAT |
| ENGINE COOLANT TEMPERATURE SENSOR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE).
Diagnostic Test
1. CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION.NOTE: Diagnose and repair any engine coolant temperature sensor circuit DTCs before proceeding with this test.
NOTE: Extremely cold ambient temperatures may cause this DTC to set.
Perform the diagnostic procedure for *CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR OPERATION.
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)