DTC DETECTION LOGIC NOTE： If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117, P0118. Refer to DTC Logic (GT-R certified NISSAN dealer).

DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause
P0125 | Insufficient engine coolant temperature for closed loop fuel control |

- Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine.
- Engine coolant temperature is insufficient for closed loop fuel control.

- Harness or connectors
  (High resistance in the circuit)
- Engine coolant temperature sensor
- Thermostat

DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

>>GO TO 2.
2.CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION

1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Check that “COOLAN TEMP/S” is above 10°C (50°F).

Is it above 10°C (50°F)?
YES>>INSPECTION END
NO>>GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and run it for 65 minutes at idle speed.If “COOLAN TEMP/S” increases to more than 10°C (50°F) within 65 minutes, stop engine because the test result will be OK.
   ■ CAUTION ■
   Never overheat engine.
2. Check 1st trip DTC.

Is 1st trip DTC detected?
YES>>Diagnosis Procedure (GT-R certified NISSAN dealer)
NO>>INSPECTION END