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

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p015a a/f / o2 sensor delayed response - rich to lean bank 1 sensor 1

ENGINE (DIAGNOSTICS)(H4DO) > 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)

Zirconia element oxygen

3. EXECUTION CONDITION

Diagnostic method 1 and 2

Secondary parameters

Execution condition

Battery voltage

≥ 10.9 V

Barometric pressure

> 75.1 kPa (563 mmHg, 22.2 inHg)

Duration of main feedback

≥ 3000 ms

Engine speed

≥ 1000 rpm

Amount of intake air

≥ 10 g/s (0.35 oz/s) (CVT model)

≥ 10 g/s (0.35 oz/s) (MT model)

DIAGNOSIS METHOD 3 (MT MODEL ONLY)

Secondary parameters

Execution condition

Battery voltage

≥ 10.9 V

Barometric pressure

≥ 75.1 kPa (563 mmHg, 22.2 inHg)

Main feedback

In operation

Vehicle speed

> 40 km/h (24.9 MPH)

Engine speed

≥ 1000 rpm

and

< 4000 rpm

Amount of intake air

≥ 7.5 g/s (0.26 oz/s)

and

< 40 g/s (1.41 oz/s)

Catalyst depletion diagnosis

Not under diagnosis

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.

Diagnosis (CVT model)

Judgment Value

Malfunction Criteria

Threshold Value

DTC

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

> 100 ms

P015A

and

Average value of time needed to change to Lean

> 130 ms

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

> 200 ms

P015B

and

Average value of time needed to change to Rich

> 300 ms

Diagnosis (MT model)

Judgment Value

Malfunction Criteria

Threshold Value

DTC

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

> 120 ms

P015A

and

Average value of time needed to change to Lean

> 150 ms

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

> 200 ms

P015B

and

Average value of time needed to change to Rich

> 250 ms

Diagnosis (CVT model)

Time Needed for Diagnosis: 90 seconds

Diagnosis (MT model)

Time Needed for Diagnosis: 60 seconds

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 (CVT model)

Malfunction Criteria

Threshold Value

DTC

Average value for λ amplitude

> 0.07

P015A and P015B

Time needed for diagnosis: 1000 ms ? 4.5 ms

Malfunction indicator light illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

7. 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.

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.

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

DTC

Condition either A or B should be satisfied.

A:

P015A and P015B

Average value for λ amplitude

> 0.1

or

B:

(t1 + t2 + t3)/3

> 450 ms

and

(t4 + t5 + t6)/3

> 450 ms

Time Needed for Diagnosis: 1000 ms ? 4.5 ms

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

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