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Home >> Subaru >> 2015 >> Outback 2.5i Limited >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4DO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P014C O2 Sensor Slow Response - Rich To Lean (Bank 1 Sensor 1) >> Diagnostic Method 2
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Diagnostic Method 2

Detect the malfunction by the cumulative value obtained from the amount of variation in λ change.

Fig 1: Sensor Output Waveform
G08317431Courtesy of SUBARU OF AMERICA, INC.

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
Cumulative value obtained from the amount of variation in λ change Σ |(lambda(n) - lambda(n-1)) - (lambda(n-1) - lambda(n-2))| < Value from Map P014C and P014D
AMPLITUDE REFERENCE

Cumulative value obtained from the amount of variation in λ Σ |lambda(n) - lambda(n-1)| 0.00 3.50
Cumulative value obtained from the amount of variation in λ change 0.00 3.50

Time Needed for Diagnosis:  70000 ms

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.