DTC P0130: O2 Sensor Circuit (Bank 1 Sensor 1)

OUTLINE OF DIAGNOSIS
Detect the malfunction of front oxygen (A/F) sensor output property.

Judge NG when the front oxygen (A/F) sensor output continues to be lean.
COMPONENT DESCRIPTION

Fig 1: A/F Sensor Cross Sectional View And Air Fuel Ratio Graph
Courtesy of SUBARU OF AMERICA, INC.

ENABLE CONDITION

ENABLE CONDITIONS

Secondary Parameters	Enable Conditions
Closed loop control	In operation
Fuel shut-off event	Not in operation
Misfire rate during 200 engine revs.	"LESS THAN EQUAL TO" 1.0%
After engine starting	230 seconds or more
Engine coolant temperature	"GREATER THAN EQUAL TO" 75°C (167°F)

GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 230 seconds after engine starting.

DIAGNOSTIC METHOD

Abnormality Judgment

Judge NG when the continuous time of completing all the malfunction criteria below becomes more than the time (10 seconds) needed for diagnosis

Judgment Value

JUDGMENT VALUE (ABNORMALITY JUDGMENT)

Malfunction Criteria	Threshold Value
A/F sensor output (VAF)	> 2.3 V (lean)
Lambda fudge factor (LAMBDA)	= Rich clamp at MAX limiter (1.375)

Time Needed for Diagnosis: 10 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as malfunction occurs.

Normality Judgment

Judge OK when the cumulative time until completing all the malfunction criteria below becomes more than the time (10 seconds) needed for diagnosis

Judgment Value

JUDGMENT VALUE (NORMALITY JUDGMENT)

Malfunction Criteria	Threshold Value
A/F sensor output (VAF)	"LESS THAN EQUAL TO" 2.3 V

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
None
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)