Subaru 2009 IMPREZA Service Manual page 733

Diagnostic Trouble Code (DTC) Detecting Criteria
3. ENABLE CONDITIONS
Secondary Parameters
Battery voltage
After engine starting
Engine oil temperature
Variable valve lift control
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously 6 seconds after engine start while variable valve lift is being controlled
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
Low
Duty ratio
Variable valve lift diagnosis oil pressure
switch
High
Duty ratio
Variable valve lift diagnosis oil pressure
switch
Time Needed for Diagnosis:
Low side: 784 ms
High side: 3000 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
Low
Duty ratio
Variable valve lift diagnosis oil pressure
switch
High
Duty ratio
Variable valve lift diagnosis oil pressure
switch
Time Needed for Diagnosis:
Low side: 208 ms
High side: 3000 ms
Enable Condition
10.9 V
6000 ms
15 °C (59 °F)
Operation
Threshold Value
62 %
OFF
< 33 %
ON
Threshold Value
62 %
ON
< 33 %
OFF
GD(H4SO)-9
GENERAL DESCRIPTION