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HOMESERVICE MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMDIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIA (H4DO)DIAGNOSTIC TROUBLE CODE (DTC) DETECTING CRITERIADTC P015A O2 SENSOR DELAYED RESPONSE - RICH TO LEAN (BANK 1 SENSOR 1)DIAGNOSIS METHOD 3 (MT MODEL ONLY)
2014 Subaru Outback 2.5i, Standard Trans

Diagnosis Method 3 (Mt Model Only)

2014 Subaru Outback 2.5i, Standard TransSECTION Diagnosis Method 3 (Mt Model Only)

Change STFT (A/F compensation value) by interruption, and measure the reaction time of λ value. When A/F sensor malfunctions, the reaction time takes longer than at normal condition. In this case, judge as abnormal.

Fig 1: STFT And Sensor Output Graph (Diagnostic Method 3, MT Model Only)
G08540818Courtesy of SUBARU OF AMERICA, INC.

Measure reaction time (t1, t2, t3) and reaction time (t4, t5, t6). Use the average value of the reaction time to obtain the diagnostic value.

Fig 2: STFT And Sensor Reaction Time Graph
G08540819Courtesy of SUBARU OF AMERICA, INC.
  • Abnormality Judgment 

Judge as NG when the following conditions are established.

JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
(t1 + t2 + t3)/3 > 820 ms (except for PZEV model) P015A and P015B
  > 800 ms (PZEV model)  
and    
(t4 + t5 + t6)/3 > 820 ms (except for PZEV model)  
  > 800 ms (PZEV model)  

Time Needed for Diagnosis:  1000 ms x [1 time(s)/2] + 1000 ms x 3 time(s) + 500 ms

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

  • Normality Judgment 

Judge as OK and clear the NG if the following conditions are established.

JUDGMENT VALUE

Malfunction Criteria Threshold Value DTC
(t1 + t2 + t3)/3 ≤ 820 ms (except for PZEV model) P015A and P015B
  ≤ 800 ms (PZEV model)  
or    
(t4 + t5 + t6)/3 ≤ 820 ms (except for PZEV model)  
  ≤ 800 ms (PZEV model)  

Time Needed for Diagnosis:  1000 ms x [1 time(s)/2] + 1000 ms x 3 time(s) + 500 ms

RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
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