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Subaru Legacy Service Manual: Dtc p015a a/f / o2 sensor delayed response - rich to lean bank 1 sensor 1

Subaru Legacy Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p015a a/f / o2 sensor delayed response - rich to lean bank 1 sensor 1

NOTE:

For the diagnostic procedure, refer to DTC P014C. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P014C A/F / O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 1

1. OUTLINE OF DIAGNOSIS

Detect the slow response of front oxygen (A/F) sensor.

For diagnosis, detect the trouble by processing the λ waveform in normal driving without forcibly changing the target air fuel ratio.

2. COMPONENT DESCRIPTION

(A)

Electromotive force

(B)

Air fuel ratio

(C)

Rich

(D)

Lean

(1)

Exhaust gas

(2)

ZrO2

3. EXECUTION CONDITION

Diagnostic method 1 and 2

Secondary Parameters

Execution condition

Battery voltage

> 10.9 V

Closed loop control of 3000 ms or more with main feedback

Operation

Engine speed

≥ 1000 rpm

Intake air amount

≥ 10 g/s (0.35 oz/s)

4. GENERAL DRIVING CYCLE

Perform diagnosis only once in a city driving including normal acceleration and deceleration.

5. DIAGNOSTIC METHOD 1

Detect the malfunction depending on the average value of time necessary for λ to inverse the air fuel ratio from “Lean > Rich > Lean” to “Rich > Lean > Rich”.

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

DTC

Average value of time necessary for λ to inverse the air fuel ratio to Lean > Rich > Lean

> 220 ms

P015A and P015C

Average value of time necessary for λ to inverse the air fuel ratio to Rich > Lean > Rich

> 320 ms

P015B and P015D

Time Needed for Diagnosis: 90000 ms

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

6. DIAGNOSTIC METHOD 2

Detect the malfunction by calculating the average amplitude of λ.

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

DTC

Average value for λ amplitude

> 0.06

A pair of P015A/P015B and a pair of P015C/P015D are diagnosed respectively.

Time Needed for Diagnosis: 90000 ms

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

Dtc p015b a/f / o2 sensor delayed response - lean to rich bank 1 sensor 1
NOTE:For the diagnostic procedure, refer to DTC P014C. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P014C A/F / O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 11. OUTLINE OF DI ...

Dtc p014d a/f / o2 sensor slow response - lean to rich bank 1 sensor 1
NOTE:For the diagnostic procedure, refer to DTC P014C. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P014C A/F / O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 11. OUTLINE OF DI ...

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