Nissan Qashqai J11. Manual - part 312
P014C, P014D A/F SENSOR 1
ECM-225
< DTC/CIRCUIT DIAGNOSIS >
[MR20DD]
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P014C, P014D A/F SENSOR 1
DTC Description
INFOID:0000000010702936
DTC DETECTION LOGIC
To judge malfunctions, this diagnosis measures response time of the A/F signal computed by ECM from the A/
F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control con-
stant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F
signal cycling time index) is inordinately long or not.
POSSIBLE CAUSE
• Harness or connectors (The A/F sensor 1 circuit is open or shorted.)
• A/F sensor 1
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
Do you have CONSULT?
YES
>> GO TO 2.
NO
>> GO TO 6.
2.
PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON.
4.
Turn ignition switch OFF and wait at least 10 seconds.
5.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1minute under no load.
6.
Let engine idle for 1 minute.
7.
Increase the engine speed up to about 3,600 rpm and keep it for 10 seconds.
8.
Fully release accelerator pedal and then let engine idle for about 1 minute.
9.
Check the items status of “DATA MONITOR” as follows.
NOTE:
If “PRSNT” changed to “ABSNT”, refer to
ECM-137, "Component Function Check"
Is “PRSNT” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> GO TO 3.
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P014C
A/F SENSOR1 (B1)
(O2 sensor slow response - rich to lean
bank 1 sensor 1)
• The response time of a A/F sensor 1 signal delays more than the speci-
fied time computed by ECM.
P014D
A/F SENSOR1 (B1)
(O2 sensor slow response - lean to rich
bank 1 sensor 1)
Data monitor item
Status
A/F SEN1 DIAG3 (B1)
PRSNT