DTC P0126 Insufficient Engine Coolant Temperature For Stable Operation

WARNING: This page is about a different variant/trim than selected.

DTC DETECTING CONDITION:

Two consecutive driving cycles with fault
GENERAL DESCRIPTION < Ref. to DTC P0126 INSUFFICIENT ENGINE COOLANT TEMPERATURE FOR STABLE OPERATION , Diagnostic Trouble Code (DTC) Detecting Criteria. >

TROUBLE SYMPTOM:

Engine would not return to idling.

CAUTION: After repair or replacement of faulty parts, conduct Clear Memory Mode < Ref. to , OPERATION , Clear Memory Mode.> and Inspection Mode < Ref. to , PROCEDURE , Inspection Mode.>.

Fig 1: DTC P0126 Circuit

Courtesy of SUBARU OF AMERICA, INC.

DTC P0126 DIAGNOSIS

Step	Check	Yes	No
1. CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed?	Inspect the DTC using "List of Diagnostic Trouble Code DTC". < Ref. to , LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >	Go to step 2.
2. CHECK ENGINE COOLANT TEMPERATURE SENSOR. Measure the resistance between engine coolant temperature sensor terminals when engine coolant is cold and after warmed-up. Terminals No. 1 - No. 2:	Is the resistance of engine coolant temperature sensor different between when engine coolant is cold and after warmed-up?	Contact your SOA Service Center.	Replace the engine coolant temperature sensor. < Ref. to ENGINE COOLANT TEMPERATURE SENSOR . >

Step

Check

Yes

1. CHECK FOR ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Inspect the DTC using "List of Diagnostic Trouble Code DTC". < Ref. to , LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . >

Go to step 2.

2. CHECK ENGINE COOLANT TEMPERATURE SENSOR.
Measure the resistance between engine coolant temperature sensor terminals when engine coolant is cold and after warmed-up.

Terminals

No. 1 - No. 2:

Is the resistance of engine coolant temperature sensor different between when engine coolant is cold and after warmed-up?

Contact your SOA Service Center.

Replace the engine coolant temperature sensor. < Ref. to ENGINE COOLANT TEMPERATURE SENSOR . >