Subaru LEGACY 2006 Manual page 494

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Diagnostic Trouble Code (DTC) Detecting Criteria
AB:DTC P0131 O2 SENSOR CIRCUIT LOW VOLTAGE (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of sensor.
Judge as NG when the element impressed voltage is out of range, or the element current is out of range.
2. COMPONENT DESCRIPTION
(2)
(4)
(1) Atmosphere
(2) Exhaust gas
(3) ZrO
2
(4) Ceramic heater
3. ENABLE CONDITION
Secondary Parameters
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
Judge as NG when the continuous time of completing any malfunction criteria below is more than 1 second.
Judgment Value
Malfunction Criteria
Input voltage
Input current
Time Needed for Diagnosis: 1 second
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
(3)
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Lean
(D) Rich
Enable Conditions
≥ 10.9 V
Threshold Value
< 1.8 V
< –0.005 A
GD(H4SO)-57
GENERAL DESCRIPTION
(A)
(C) (B) (D)
EN-01693