Subaru 2009 IMPREZA Service Manual page 1691

Diagnostic Trouble Code (DTC) Detecting Criteria
Combination valve changeover pressure diagnosis
Perform the RH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when
the RH combination valve turns closed
Delivery pipe pressure should vary when the RH combination valve turns closed
is small, determine that the RH combination valve is stuck 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
Pressure variation value when the RH
combination valve is switched
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
Pressure variation value when the RH
combination valve is switched
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
Perform the LH combination valve stuck closed diagnosis with the variation of delivery pipe pressure when
the LH combination valve turns open
Delivery pipe pressure should vary when the LH combination valve turns open
is small, determine that the LH combination valve is stuck 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
Pressure variation value when the LH
combination valve is switched
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
Pressure variation value when the LH
combination valve is switched
Time Needed for Diagnosis: 4000 ms + 992 ms + 992 ms + 992 ms
open.
Threshold Value
< Value of Map 6 P2441
Threshold Value
Value of Map 6 P2441
closed.
Threshold Value
< Value of Map 7 P2443
Threshold Value
Value of Map 7 P2443
GD(H4DOTC)-103
GENERAL DESCRIPTION
open. When the variation
DTC
DTC
closed. When the variation
DTC
DTC