Subaru 2009 IMPREZA Service Manual page 1692

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
Overflow diagnosis
Perform secondary air system flow abnormality diagnosis using both sides of combination valves secondary
air amount when both are closed.
Judge as secondary air system flow abnormality either if there is excessive secondary air flow amount with
the RH combination valve closed, or if there is excessive secondary air flow amount with the LH combination
valve closed.
• 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
Air flow amount when the right bank is
closed (value from Map 4)
or
Air flow amount when the left bank is
closed (value from Map 5)
Voltage at P0RL measurement – Voltage
at P0R measurement
Voltage at P0RL measurement – Voltage
at P0L measurement
P0RL: Both banks all closed pressure
P0R: Right bank all closed pressure
P0L: Left bank all closed pressure
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• 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
Air flow amount when the right bank is
closed (value from Map 4)
or
Air flow amount when the left bank is
closed (value from Map 5)
Voltage at P0RL measurement – Voltage
at P0R measurement
Voltage at P0RL measurement – Voltage
at P0L measurement
P0RL: Both banks all closed pressure
P0R: Right bank all closed pressure
P0L: Left bank all closed pressure
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Map1
Amount of intake air (g (oz)/s)
Engine speed (rpm)
0
10000
Threshold Value
> Value of Map 8 P0411
> Value of Map 9
4 V
4 V
Threshold Value
Value of Map 8 P0411
Value of Map 9
4 V
4 V
60
0 (0)
(2.12)
0 0
0 0
(V)
GD(H4DOTC)-104
DTC
DTC