Nissan Murano. Manual — part 531
EC-234
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR
1
Description
INFOID:0000000009719970
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of approxi-
mately 800
°
C (1,472
°
F).
DTC Logic
INFOID:0000000009719971
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.
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.
JMBIA0112GB
PBIB3354E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P014C
Air fuel ratio (A/F) sensor 1
(bank 1) circuit slow re-
sponse
• The response time of a A/F sensor 1 signal de-
lays more than the specified time computed by
ECM.
• Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
• A/F sensor 1
P014D
P015A
Air fuel ratio (A/F) sensor 1
(bank 1) circuit delayed re-
sponse
P015B
P014E
Air fuel ratio (A/F) sensor 1
(bank 2) circuit slow re-
sponse
P014F
P015C
Air fuel ratio (A/F) sensor 1
(bank 2) circuit delayed re-
sponse
P015D
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
EC-235
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
EC-201, "Component Function Check"
.
Is “PRSNT” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
Perform DTC confirmation procedure-1 again.
Is “PRSNT” displayed on CONSULT screen?
YES
>> GO TO 4.
NO
>> Refer to
EC-201, "Component Function Check"
.
4.
PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
1.
Wait for about 20 seconds at idle.
2.
Check the items status of “DATA MONITOR” as follows.
NOTE:
If “CMPLT” changed to “INCMP”, refer to
EC-201, "Component Function Check"
Is “CMPLT” displayed on CONSULT screen?
DTC
Data monitor item
Status
• P014C
• P014D
• P015A
• P015B
A/F SEN1 DIAG3 (B1)
PRSNT
• P014E
• P014F
• P015C
• P015D
A/F SEN1 DIAG3 (B2)
DTC
Data monitor item
Status
• P014C
• P014D
• P015A
• P015B
A/F SEN1 DIAG1 (B1)
CMPLT
A/F SEN1 DIAG2 (B1)
• P014E
• P014F
• P015C
• P015D
A/F SEN1 DIAG1 (B2)
A/F SEN1 DIAG2 (B2)
EC-236
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
YES
>> GO TO 5.
NO
>> Refer to
EC-201, "Component Function Check"
.
5.
PERFORM SELF-DIAGNOSIS
With CONSULT
Check the “SELF-DIAG RESULT”.
Is any DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
6.
CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
With GST
1.
Start engine and warm it up to normal operating temperature.
2.
Select Service $01 with GST.
3.
Calculate the total value of “Short term fuel trim” and “Long term fuel trim” indications.
Is the total percentage within
±
15%?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
• Intake air leaks
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Fuel injector
• Incorrect PCV hose connection
• PCV valve
• Mass air flow sensor
>> Repair or replace malfunctioning part.
8.
PERFORM DTC CONFIRMATION PROCEDURE
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.
4.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5.
Let engine idle for 1 minute.
6.
Increase the engine speed up to about 3,600 rpm and keep it for 10 seconds.
7.
Fully release accelerator pedal and then let engine idle for about 1 minute.
8.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009719972
1.
CHECK GROUND CONNECTION
1.
Turn ignition switch OFF.
2.
Check ground connection M95. Refer to Ground Inspection in
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair or replace ground connection.
2.
RETIGHTEN A/F SENSOR 1
Loosen and retighten the A/F sensor 1. Refer to
P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1
EC-237
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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>> GO TO 3.
3.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before three way catalyst 1.
Is exhaust gas leak detected?
YES
>> Repair or replace.
NO
>> GO TO 4.
4.
CHECK FOR INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES
>> Repair or replace.
NO
>> GO TO 5.
5.
CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1.
Clear the mixture ratio self-learning value. Refer to
EC-22, "MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement"
.
2.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171, P0172, P0174 or P0175 detected? Is it difficult to start engine?
YES
>> Perform trouble diagnosis for DTC P0171, P0174 or P0172, P0175. Refer to
or
NO
>> GO TO 6.
6.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Disconnect A/F sensor 1 harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between A/F sensor 1 harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 7.
7.
DETECT MALFUNCTIONING PART
Check the following.
• IPDM E/R harness connector F12
• 15 A fuse (No. 46)
• Harness for open or short between A/F sensor 1 and fuse
PBIB1922E
DTC
A/F sensor 1
Ground
Voltage
Bank
Connector
Terminal
• P014C
• P014D
• P015A
• P015B
1
F27
4
Ground
Battery voltage
• P014E
• P014F
• P015C
• P015D
2
F64
4
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