P0125

DTC P0125 INSUFFICIENT COOLANT TEMR FOR CLOSED LOOP FUEL CONTROL





WIRING DIAGRAM

CIRCUIT DESCRIPTION
Located at the side of intake manifold, this sensor measures the temperature of the engine coolant and converts its change into that in resistance through the thermistor.
By monitoring the resistance of the coolant temperature sensor, ECM detects the engine coolant temperature and that affects most systems under the control of ECM.





DETECTING CONDITION

DTC CONFIRMATION PROCEDURE

NOTE: Check to make sure that following conditions are satisfied when using this DTC CONFIRMATION PROCEDURE.
- Intake air temp.: -14C, 6.8°F or higher.
- Barometric pressure (Altitude) : 540 mmHg, 72 kPa or more (2790m, 9150 ft or less).

1) Connect scan tool to DLC with ignition switch OFF
2) Turn ON ignition switch and clear DTC,pending DTC and freeze frame data by using scan tool.
3) Start engine and warm up it till engine coolant temp is become higher than 31 °C (If engine coolant temp is higher than 31 °C at start run engine for 1 min.).
4) Check pending DTC and DTC by using scan tool.





TROUBLESHOOTING














ENGINE COOLANT TEMPERATURE SENSOR (ECT SENSOR)

Removal
1) Disconnect negative cable from battery.
2) Drain cooling system.
3) Disconnect coupler from ECT sensor.
4) Remove ECT sensor from intake manifold.

Inspection
Immerse temperature sensing part of ECT sensor in water and measure resistance between sensor terminals while heating water gradually.
If measured resistance doesn't show such characteristic as shown, replace ECT sensor.

Installation
Reverse removal procedure noting the following.
- Clean mating surfaces of sensor and intake manifold.
- Use new gasket.
- Tighten ECT sensor to specified torque.

Tightening Torque
(a): 15 N.m (1.5 kg-m, 11.0 lb-ft)

- Connect coupler to sensor securely.
- Refill cooling system.