Subaru Crosstrek Service Manual: 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
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)
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)
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.
Malfunction Criteria | Threshold Value | DTC |
Cumulative value obtained from the amount of variation in λ change | < Value from Map | P014C and P014D |
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 |
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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Installation
MECHANICAL(H4DO) > Cylinder HeadINSTALLATION1. CYLINDER HEAD RH1. Clean the bolt holes in the cylinder block RH.CAUTION:To avoid erroneous tightening of the bolts, clean out the bolt holes sufficiently by blowing with compressed air to eliminate engine coolant etc.2. Apply liquid gasket to both s ...
Wheel replacement
When replacing wheels due, for example,
to damage, make sure the replacement
wheels match the specifications of the
wheels that are fitted as standard equipment.
Replacement wheels are available
from SUBARU dealers.
WARNING
Use only those wheels that are
specified for your vehicle. Wheels
...
