Troubleshooting

DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control

CIRCUIT DESCRIPTION

DTC Detection Condition:

A thermistor built into the engine coolant temp. 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 in the DTC P0110, P0112 and P0113.

Step 1 - 2:

INSPECTION PROCEDURE

HINT:
- If DTCs P0115 and P0116 are output simultaneously, engine coolant temp. sensor circuit may be open. Perform troubleshooting of DTC P0115 first.
- Read freeze frame data using hand-held tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, this 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.