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Subaru Crosstrek Service Manual: Dtc p013b o2 sensor slow response - lean to rich bank 1 sensor 2

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

DTC P013B O2 SENSOR SLOW RESPONSE - LEAN TO RICH BANK 1 SENSOR 2

NOTE:

For the diagnostic procedure, refer to DTC P013A. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P013A O2 SENSOR SLOW RESPONSE - RICH TO LEAN BANK 1 SENSOR 2">

1. OUTLINE OF DIAGNOSIS

Detect the slow response of lean > rich for rear oxygen sensor output.

After the deceleration fuel cut has occurred, detect the trouble by calculating the time when the rear oxygen sensor output passes through the predetermined range of voltages.

Judge as NG when the response time is larger than the threshold value.

2. COMPONENT DESCRIPTION

(A)

Electromotive force

(B)

Air fuel ratio

(C)

Lean

(D)

Rich

(E)

Theoretical air fuel ratio

(F)

Comparative voltage

(1)

Atmosphere

(2)

Exhaust gas

(3)

Electromotive force

3. EXECUTION CONDITION

Secondary parameters

Execution condition

Battery voltage

≥ 10.9 V

Main feedback

In operation

(Elapsed time after fuel cut

≥ 5000 ms

Time of fuel cut recovery from above)

≥ 4000 ms

4. GENERAL DRIVING CYCLE

Perform diagnosis only once after recovering from a deceleration fuel cut continued for more than predetermined time.

5. DIAGNOSTIC METHOD

Detect the trouble by calculating the response time of the rear oxygen sensor after fuel cut.

(A)

0.55 V

(B)

0.50 V

(C)

0.30 V

(D)

0.25 V

(E)

0 V

(F)

Diagnostic parameter

(G)

Normal

(H)

Malfunction

Judge as NG when the following conditions are established.

Judgment value

Malfunction Criteria

Threshold Value

Time needed for rear oxygen sensor voltage to change from 0.3 V to 0.5 V

> 4000 ms

Time needed for diagnosis: Less than 1 second

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

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