Subaru IMPREZA GD 2007 Series Manual page 235

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Y: DTC P0125 INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP
FUEL CONTROL
DTC DETECTING CONDITION:
• Detected when two consecutive driving cycles with fault occur.
• GENERAL DESCRIPTION <Ref. to GD(H4SO)-50, DTC P0125 INSUFFICIENT COOLANT TEMPERA-
TURE FOR CLOSED LOOP FUEL CONTROL, Diagnostic Trouble Code (DTC) Detecting Criteria.>
TROUBLE SYMPTOM:
Engine does not return to idle.
CAUTION:
After repairing or replacing the defective parts, perform the Clear Memory Mode <Ref. to
EN(H4SO)(diag)-47, OPERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)(di-
ag)-38, PROCEDURE, Inspection Mode.>.
Step
1 CHECK TIRE SIZE.
2 CHECK ENGINE COOLANT.
Check the following items:
• Amount of engine coolant
• Engine coolant freeze
• Contamination of engine coolant
3 CHECK THERMOSTAT.
Check
Is the tire size as specified? and
the same size as other three
wheels?
Is the engine coolant normal?
Does the thermostat remain
opened?
EN(H4SO)(diag)-126
Yes No
Go to step 2.
Replace the tire.
Go to step 3. Fill or replace the
engine coolant.
<Ref. to
CO(H4SO)-17,
INSPECTION,
Engine Coolant.>
Replace the ther- Replace the
mostat. <Ref. to engine coolant
CO(H4SO)-21, temperature sen-
Thermostat.> sor. <Ref. to
FU(H4SO)-22,
Engine Coolant
Temperature Sen-
sor.>