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Nissan Maxima. Manual - part 442

EC-252

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

Replace malfunctioning heated oxygen sensor 2. Refer to

EM-31, "Removal and Installation (LH)"

(LH) or

EM-

33, "Removal and Installation (RH)"

(RH).

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant

(commercial service tool).

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to

GI-41, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000010094953

INSPECTION START

Will CONSULT be used?
Will CONSULT be used?

YES

>> GO TO 2.

>> GO TO 3.

CHECK HEATED OXYGEN SENSOR 2

With CONSULT

1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT.

2. Start engine and warm it up to the normal operating temperature.

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. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)/(B2)” as the monitor item

with CONSULT.

7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to

±25%.

: “HO2S2 (B1)/(B2)” should be above 0.78 V at least once when the “FUEL INJECTION” is +25%.
: “HO2S2 (B1)/(B2)” should be below 0.18 V at least once when the “FUEL INJECTION” is

−25%.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

CHECK HEATED OXYGEN SENSOR 2-I

Without CONSULT

1. Start engine and warm it up to the normal operating temperature.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4. Let engine idle for 1 minute.

JSBIA3451ZZ

P0139, P0159 HO2S2

EC-253

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

5. Check the voltage between ECM harness connector terminals

under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 4.

CHECK HEATED OXYGEN SENSOR 2-II

Check the voltage between ECM harness connector terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 2-III

Check the voltage between ECM harness connector terminals under

the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

ECM

Condition

Voltage

Con-

nector

–

Terminal

F13

[HO2S2

(bank 1)

signal]

(Sensor
ground)

Revving up to 4,000
rpm under no load at
least 10 times

The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.

[HO2S2

(bank 2)

signal]

JMBIA1865ZZ

ECM

Condition

Voltage

Con-

nector

–

Terminal

F13

[HO2S2

(bank 1)

signal]

(Sensor
ground)

Keeping engine at
idle for 10 minutes

The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.

[HO2S2

(bank 2)

signal]

JMBIA1866ZZ

ECM

Condition

Voltage

Con-

nector

–

Terminal

F13

[HO2S2

(bank 1)

signal]

(Sensor
ground)

Coasting from 80 km/
h (50 MPH) in D posi-
tion

The voltage should be
above 0.78 V at least
once during this proce-
dure.
The voltage should be
below 0.18 V at least
once during this proce-
dure.

[HO2S2

(bank 2)

signal]

JMBIA1867ZZ

EC-254

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

REPLACE HEATED OXYGEN SENSOR 2

Replace malfunctioning heated oxygen sensor 2. Refer to

EM-31, "Removal and Installation (LH)"

(LH) or

EM-

33, "Removal and Installation (RH)"

(RH).

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

• Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread

Cleaner [commercial service tool (J-43897-18 or J-43897-12)] and approved anti-seize lubricant

(commercial service tool).

>> INSPECTION END

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR 1

EC-255

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D A/F SENSOR
1

Description

INFOID:0000000010094954

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 via 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 about 800

°C

(1,472

°F).

DTC Logic

INFOID:0000000010094955

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

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

Content .. 440 441 442 443 ..