Subaru 2009 IMPREZA Service Manual page 747

Diagnostic Trouble Code (DTC) Detecting Criteria
I: DTC P0076 INTAKE VALVE CONTROL SOLENOID CIRCUIT LOW (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the open circuit of the oil switching solenoid valve.
Judge as NG when the current is small even though the output duty is large.
2. ENABLE CONDITION
Secondary Parameters
Battery voltage
3. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
4. 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
Duty ratio
Control current
Time Needed for Diagnosis: 2000 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
|Oil switching solenoid valve target cur-
rent value – Oil switching solenoid valve
current value|
Target current
Time Needed for Diagnosis: 2000 ms
Enable Condition
10.9 V
Threshold Value
30 %
< 0.026 A
Threshold Value
< 0.08 A
0.11 A
GD(H4SO)-23
GENERAL DESCRIPTION