Subaru IMPREZA GD 2007 Series Manual page 1803

asieps_tobira_IM_US.book 12 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
E: DTC P0030 HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1)
1. OUTLINE OF DIAGNOSIS
Detect functional errors of the front oxygen (A/F) sensor heater.
Judge as NG when it is determined that the front oxygen (A/F) sensor impedance is large when looking at en-
gine status such as deceleration fuel cut.
2. COMPONENT DESCRIPTION
(1)
(1) Protection tube
(2) Gasket
3. ENABLE CONDITION
Secondary Parameters
Time needed for all secondary parame-
ters to be in enable conditions
Battery voltage
After fuel cut
Front oxygen (A/F) sensor heater control
duty≥ 35%
Heater current
4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously after 30 seconds or more have passed since the engine started.
5. DIAGNOSTIC METHOD
Judge as NG if the duration of time while the following criteria are met is the time needed for diagnosis (10
seconds) or more. Judge as OK and clear NG when the continuous time of not completing the malfunction
criteria below becomes the time needed for diagnosis (10 seconds) or more.
Judgment Value
Malfunction Criteria
Front oxygen (A/F) sensor impedance
Time Needed for Diagnosis: 10 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
(4)
(2)
(3)
(3) Sensor housing
Enable Conditions
42 seconds or more
> 10.9 V
20 seconds or more
Experienced
Permitted
Threshold Value
> 50 Ω
GD(H4DOTC)-12
EN-01763
(4) Ceramic heater