Troubleshooting

DTC P0125 INSUFFICIENT COOLANT TEMP. FOR CLOSED LOOP FUEL CONTROL

CIRCUIT DESCRIPTION

DTC Detection Condition:

A thermistor built in the engine coolant temperature sensor changes the resistance value according to the engine coolant temperature.

The structure of the sensor and connection to the ECM is the same as those of the air temperature sensor.

Step 1:

Step 2:

INSPECTION PROCEDURE

HINT: Read freeze frame data using hand-held tester or OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.