Subaru LEGACY 2006 Manual page 505

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Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG if the continuous time during which the following conditions are established exceeds the pre-
determined time, and judge as OK if it doesn't.
Judgment Value
Malfunction Criteria
High side
Maximum output voltage without continu-
ity
Low side
Minimum output voltage without continu-
ity
Time Needed for Diagnosis
High side: 2.5 seconds
Low side 1: 20 seconds
Low side 2: 40 seconds
Low side 3: Value from Map
Map
Fuel Cut Time (Seconds)
0
2
10
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
Sub feedback control: Not allowed.
9. ECM OPERATION AT DTC SETTING
• Memorize the freeze frame data. (For test mode $02)
• Memorize the diagnostic value and trouble standard value. (For test mode $06)
AG:DTC P0138 O2 SENSOR CIRCUIT HIGH VOLTAGE (BANK 1 SENSOR 2)
NOTE:
For the diagnostic procedure, refer to DTC P0137. <Ref. to GD(H4SO)-66, DTC P0137 O2 SENSOR CIR-
CUIT LOW VOLTAGE (BANK 1 SENSOR 2), Diagnostic Trouble Code (DTC) Detecting Criteria.>
Threshold Value
P0138
≥ 1200 mV
P0137
< 30 mV
Time Needed for Diag-
nosis (Seconds)
40
40
60
GD(H4SO)-68
DTC