Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0125 insufficient coolant temperature for closed loop fuel control

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0125 insufficient coolant temperature for closed loop fuel control

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

TROUBLE SYMPTOM:

Engine does not return to idle.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

STEP	CHECK	YES	NO
1.CHECK TIRE SIZE.	Is the tire size as specified and the same size as three other wheels-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL	Replace the tire.
2.CHECK ENGINE COOLANT. Check the following items: • Amount of engine coolant • Engine coolant freeze • Contamination of engine coolant	Is the engine coolant normal-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROL	Fill or replace the engine coolant. Engine Coolant > REPLACEMENT
3.CHECK THERMOSTAT.	Does the thermostat remain opened-	Replace the thermostat. Thermostat	Replace the engine coolant temperature sensor. Engine Coolant Temperature Sensor

1. OUTLINE OF DIAGNOSIS

Detect the malfunction of engine coolant temperature output property.

Judge as NG when engine coolant temperature does not rise to the specified value after predetermined time has elapsed since engine start.

2. COMPONENT DESCRIPTION

(A)	Resistance value (k-)	(B)	Temperature °C (°F)

(1)	Connector	(2)	Thermistor element

3. EXECUTION CONDITION

Secondary Parameters	Execution condition
Engine coolant temperature at engine start	< −15 °C (5 °F)
Engine speed	> 500 rpm

4. GENERAL DRIVING CYCLE

Perform the diagnosis only once after starting the engine from cold condition.

5. DIAGNOSTIC METHOD

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgment Value

Malfunction Criteria	Threshold Value
Engine coolant temperature	< −15 °C (5 °F)
Elapsed time after starting the engine
(At the time of (The smaller value of either Engine coolant temperature or Intake air temperature at engine start) ≥ −23.3°C (−9.9°F))	≥ 120 s
or
(At the time of (The smaller value of either Engine coolant temperature or Intake air temperature at engine start) < −23.3°C (−9.9°F))	≥ 300 s

Time Needed for Diagnosis: 120 or 300 seconds

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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