Result:
HINT
If any DTCs other than P0125 are output, troubleshoot those DTCs first.
B -- GO TO DTC CHART See: Diagnostic Trouble Code Descriptions/SFI System
A -- Continue to next step.
2. INSPECT THERMOSTAT
(a) Remove the thermostat See: Engine, Cooling and Exhaust/Cooling System/Thermostat/Service and Repair/Removal.
(b) Check the valve opening temperature of the thermostat.
Standard:
80 to 84锟斤拷C (176 to 183锟斤拷F)
HINT
In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
(c) Reinstall the thermostat See: Engine, Cooling and Exhaust/Cooling System/Thermostat/Service and Repair/Installation.
NG -- REPLACE THERMOSTAT See: Engine, Cooling and Exhaust/Cooling System/Thermostat/Service and Repair/Removal
OK -- Continue to next step.
3. CHECK COOLING SYSTEM
(a) Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any
modifications.
NG -- REPAIR OR REPLACE COOLING SYSTEM
OK -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR See: Engine, Cooling and Exhaust/Cooling System/Engine -
Coolant Temperature Sensor/Switch/Engine Temperature Sensor/Service and Repair/Removal
From 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
P0125 - Insufficient Coolant Temperature for Closed Loop Fuel Control
DESCRIPTION
A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor.
The structure of the sensor and its connection to the ECM are similar to those of the intake air temperature sensor.
HINT
When any of DTCs P0115, P0117 or P0118 are set, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant
temperature is estimated to be 80锟斤拷C (176锟斤拷F) by the ECM. Fail-safe mode continues until a pass condition is detected.
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