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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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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