Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Subaru Forester 1999-2004 Approved Subaru Forester 2004 2 - Engine Section (H4SO) General Description Diagnostic Trouble Code (DTC) Detecting Criteria

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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.
Diagnosis is performed using A/F microcomputer, and communication is established between A/F microcom-
puter and main microcomputer. Judge NG when the data of heater malfunction NG is transmitted.
Judge NG when the front oxygen (A/F) sensor element impedance is out of the standard value.
2. COMPONENT DESCRIPTION




                                         (5)
   (1)         (2)   (3)   (4)




                                                                                                   EN-01683


         (1)     Element cover (outer)
         (2)     Element cover (inner)
         (3)     Sensor element
         (4)     Ceramic heater
         (5)     Sensor housing

3. ENABLE CONDITIONS
          Secondary Parameters                   Enable Conditions
Battery voltage                                > 10.9 V
After heater control starting                  More than 30 seconds
After fuel shut-off                            More than 20 seconds

4. GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 30 seconds after the heater continuity starting, and complete the di-
agnosis if making a NG judgment.




                                                         GD(H4SO)-9
             DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA
GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD



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