Honda Civic manuals

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

Subaru Legacy Service Manual / Engine (diagnostics)(h6do) / 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.

STEPCHECKYESNO

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)

ZrO2

3. EXECUTION CONDITION

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 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.

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 P014E

> 0.61

P014D and P014F

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 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

Σ |(lambda(n) − lambda(n-1)) − (lambda(n-1) − lambda(n-2))|

< Value from Map

A pair of P014C/P014D and a pair of P014E/P014F are diagnosed respectively.

Map

Cumulative value obtained from the amount of variation in λ

Σ |lambda(n) − lambda(n-1)|

0.00

2.00

Cumulative value obtained from the amount of variation in λ change

0.00

2.00

Time Needed for Diagnosis: 90000 ms

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

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 ...

Dtc p0141 o2 sensor heater circuit bank 1 sensor 2
NOTE:Refer to DTC P0037 for diagnostic procedure. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0037 A/F / O2 HEATER CONTROL CIRCUIT LOW BANK 1 SENSOR 21. OUTLINE OF DIAGNOSISDetect ...

Other materials:

Inspection
1. CHECK SWITCH UNITMeasure the resistance between harness connector terminals of the X mode switch. Terminal No.StandardOFF (when measured without operating the switch)No. 1 — No. 41 M- or moreON (when measured with the switch held down)Less than 1 -2. CHECK X MODE SYSTEMDIAGNOSIS:It does not swi ...

© 2017-2019 Copyright www.sulegacy.com