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Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls (Diagnostics) (H4DOTC)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0128 Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK FOR ANY OTHER DTC ON DISPLAY.  Is any other DTC displayed? Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". < Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . > Go to step 2. 
2 CHECK ENGINE COOLANT.  Is the engine coolant amount normal? Go to step 3.  Refill the engine coolant. < Refer to ENGINE COOLANT . >
3 CHECK RADIATOR FAN. 
  1. Start the engine.
  2. Check the radiator fan operation.
 Does the radiator fan continuously rotate for 3 minutes or more during idling? Repair radiator fan circuit. < Refer to RADIATOR MAIN FAN AND FAN MOTOR . > < Refer to RADIATOR SUB FAN AND FAN MOTOR . > Replace the thermostat. < Refer to THERMOSTAT . >
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