Subaru 2009 IMPREZA Service Manual page 765

Diagnostic Trouble Code (DTC) Detecting Criteria
Z: DTC P0126 INSUFFICIENT ENGINE COOLANT TEMPERATURE FOR STABLE
OPERATION
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of the engine coolant temperature sensor characteristics.
Memorize the engine coolant temperature and fuel temperature at the last engine stop, and use them to
judge as NG when the engine coolant temperature does not decrease when it should.
2. COMPONENT DESCRIPTION
(A) Resistance value (k )
(1) Connector
3. ENABLE CONDITIONS
Secondary Parameters
Battery voltage
Refueling from the last engine stop till
the current engine start
Fuel level
Engine coolant temperature at the last
engine stop
4. GENERAL DRIVING CYCLE
Perform the diagnosis only once after starting the engine.
(1)
(2)
(B) Temperature °C (°F)
(2) Thermistor element
Enable Condition
10.9 V
None
15 2 (3.96 US gal,
3.3 Imp gal)
75 °C (167 °F)
GD(H4SO)-41
GENERAL DESCRIPTION
(A)
(B)
EN-02917