Subaru IMPREZA GD 2007 Series Manual page 1854

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Diagnostic Trouble Code (DTC) Detecting Criteria
AC:DTC P0134 O2 SENSOR CIRCUIT NO ACTIVITY DETECTED
(BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect open circuits of the sensor.
Judge as NG when the impedance of the element is large.
2. COMPONENT DESCRIPTION
(2)
(4)
(1) Atmosphere
(2) Exhaust gas
(3) ZrO
2
(4) Ceramic heater
3. ENABLE CONDITION
Secondary Parameters
None
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
Judge as NG when the continuous time of completing the malfunction criteria below becomes 5 seconds or
more.
Judgment Value
Malfunction Criteria
Voltage
Time of heater control duty at 70% or
more
Front oxygen (A/F) sensor impedance
Time Needed for Diagnosis: 5 seconds
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
(3)
(1)
(2)
(A) Electromotive force
(B) Air fuel ratio
(C) Lean
(D) Rich
Enable Conditions
Threshold Value
≥ 10.9 V
≥ 36 seconds
≥ 500 Ω
GD(H4DOTC)-63
GENERAL DESCRIPTION
(A)
(C) (B) (D)
EN-01693