DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [11/2016 - ]: Procedure
WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK ANY OTHER DTCS OUTPUT (IN ADDITION DTC P0125-00)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
- Read the DTCs.
Powertrain > Engine > Trouble Codes
Result Proceed to DTC P0125-00 is output A DTC P0125-00 and other DTCs are output B HINT:
If any DTCs other than P0125-00 are output, troubleshoot those DTCs first.
Result:
B
GO TO DTC CHART.
Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2016 - 10/2017]
Refer to DIAGNOSTIC TROUBLE CODE CHART [10/2017 - ]
Result:
A
See step 2
- INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
- Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).
Refer to INSPECTION [11/2016 - ]
Proceed to OK NG
Result:
NG
REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY.
Refer to REMOVAL [11/2016 - ]
Result:
OK
See step 3
- Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).
- CHECK ENGINE COOLING SYSTEM
- Check for defects in the engine cooling system that might cause the system to be too cold, such as abnormal cooling fan operation or any modifications.
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Refer to INITIALIZATION [11/2016 - ]
Proceed to OK NG
Result:
OK
REPLACE ENGINE COOLANT TEMPERATURE SENSOR.
Refer to REMOVAL [11/2016 - ]
Result:
NG
REPAIR OR REPLACE ENGINE COOLING SYSTEM
- Check for defects in the engine cooling system that might cause the system to be too cold, such as abnormal cooling fan operation or any modifications.