Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Impreza 2001-2002.2004-2007 Approved Subaru Impreza 2004 WRX STi 03. GENERAL DESCRIPTION SECTION 02. General Description H4 DOTC 02. Diagnostic Trouble Code (DTC) Detecting Criteria

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              DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA
                                                                                GENERAL DESCRIPTION

2. Diagnostic Trouble Code (DTC) Detecting Criteria
A: DTC P0030 -- HO2S HEATER CONTROL CIRCUIT (BANK 1 SENSOR 1) --
1. OUTLINE OF DIAGNOSIS
Detect the malfunction of front oxygen (A/F) sensor heater.
Judge NG when impedance of front oxygen (A/F) sensor is larger than the standard value by referring to
the engine condition such as fuel shut-off in deceleration, etc.
2. COMPONENT DESCRIPTION




                                                      (4)
                               (2)




                (1)

                                               (3)




                                                                                                EN-01763


       (1)   Protection tube
       (2)   Gasket
       (3)   Sensor housing
       (4)   Ceramic heater

3. ENABLE CONDITION
          Secondary Parameters            Enable Conditions
Time needed for all secondary parame-   60 seconds or more
ters to be in enable conditions
Battery voltage                         > 10.9 V
After fuel shut-off                     20 seconds or more

4. GENERAL DRIVING CYCLE
Perform diagnosis continuously in 60 seconds after starting engine.




                                                GD(H4DOTC)-9
             DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA
GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD
Judge NG when the continuous time of completing the malfunction criteria below becomes more than
the time needed for diagnosis (10 seconds). Judge OK and clear NG when the continuous time of not com-
pleting the malfunction criteria below becomes more than the time needed for diagnosis (10 seconds).
Judgment Value
         Malfunction Criteria               Threshold Value
Impedance of front oxygen (A/F) sensor   > 52 
Time Needed for Diagnosis: 10 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
6. DTC CLEAR CONDITION

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