Subaru 2009 IMPREZA Service Manual page 1668

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
AR:DTC P0246 TURBO/SUPER CHARGER WASTEGATE SOLENOID "A" HIGH
1. OUTLINE OF DIAGNOSIS
Detect open or short circuit of the wastegate control solenoid valve.
Judge as NG when the terminal output voltage remains Low or High during outputting the duty signal.
2. COMPONENT DESCRIPTION
(1) Coil
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
Elapsed time after starting the engine
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after starting the engine.
5. DIAGNOSTIC METHOD
Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Terminal output voltage
Duty ratio of wastegate control
Time Needed for Diagnosis: 640 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Terminal output voltage
Time Needed for Diagnosis: Less than 1 second
(1)
Enable Conditions
10.9 V
1 second
Threshold Value
High
25%
Threshold Value
Low
GD(H4DOTC)-80
EN-01772