Subaru Crosstrek Service Manual: Dtc p014c a/f / o2 sensor slow response - rich to lean bank 1 sensor 1

Subaru Crosstrek Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p014c a/f / o2 sensor slow response - rich to lean bank 1 sensor 1

ENGINE (DIAGNOSTICS)(H4DO) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)

DTC P014C A/F / O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 1

DTC DETECTING CONDITION:

Detected when two consecutive driving cycles with fault occur.

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION">, and Inspection Mode Inspection Mode > PROCEDURE">.

STEP	CHECK	YES	NO

1.CHECK EXHAUST SYSTEM.

NOTE:

Check the following items.

• Loose installation of front portion of exhaust pipe onto cylinder heads

• Loose connection between front exhaust pipe and front catalytic converter

• Damage of exhaust pipe resulting in a hole

Is there any fault in exhaust system?

Repair the exhaust system.

Replace the front oxygen (A/F) sensor. Front Oxygen (A/F) Sensor">

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)

4. GENERAL DRIVING CYCLE

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

5. DIAGNOSTIC METHOD 1

Detect the malfunction by checking “Cumulative value of time when λ changes from lean > rich” in comparison to “Time during which diagnosis is in progress”.

(A)

Time during which diagnosis is in progress

(B)

Cumulative value of time when λ changes from lean > rich

Judge as NG when the following conditions are established.

Diagnosis (CVT model)

Judgment Value

Malfunction Criteria	Threshold Value	DTC
(Cumulative value of time when λ changes from lean > rich) / (Time during which diagnosis is in progress)	< 0.39	P014C
and
Average value of time necessary for λ to inverse the air fuel ratio to Lean > Rich > Lean	< 30 ms
(Cumulative value of time when λ changes from rich > lean) / (Time during which diagnosis is in progress)	> 0.63	P014D
and
Average value of time necessary for λ to inverse the air fuel ratio to Rich > Lean > Rich	> 20 ms

Diagnosis (MT model)

Judgment Value

Malfunction Criteria	Threshold Value	DTC
(Cumulative value of time when λ changes from lean > rich) / (Time during which diagnosis is in progress)	< 0.4	P014C
and
Average value of time necessary for λ to inverse the air fuel ratio to Lean > Rich > Lean	< 25 ms
(Cumulative value of time when λ changes from rich > lean) / (Time during which diagnosis is in progress)	> 0.6	P014D
and
Average value of time necessary for λ to inverse the air fuel ratio to Rich > Lean > Rich	> 5 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 the cumulative value obtained from the amount of variation in λ change.

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	< Value from Map	P014C and P014D

Map (CVT model)

Cumulative value obtained from the amount of variation in λ	0.00	3.50
Cumulative value obtained from the amount of variation in λ change	0.00	3.50

Map (MT model)

Cumulative value obtained from the amount of variation in λ	0.00	3.50
Cumulative value obtained from the amount of variation in λ change	0.00	3.50

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.

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