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Nissan Altima L32. Manual - part 534

P0138, P0158 HO2S2

EC-1257

< COMPONENT DIAGNOSIS >

[VQ35DE]

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.

REPLACE HEATED OXYGEN SENSOR 2

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 0.68 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]

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 0.68 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) while se-
lector lever is in the D
(CVT) or 4th position
(M/T)

The voltage should be
above 0.68 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-1258

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0138, P0158 HO2S2

Replace malfunctioning heated oxygen sensor 2.

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

P0139, P0159 HO2S2

EC-1259

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

Description

INFOID:0000000004362104

The heated oxygen sensor 2, after three way catalyst (manifold),

monitors the oxygen level in the exhaust gas on each bank.

Even if switching characteristics of the air fuel ratio (A/F) sensor 1

are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-

nal from the heated oxygen sensor 2.

This sensor is made of ceramic zirconia. The zirconia generates volt-

age from approximately 1 V in richer conditions to 0 V in leaner con-

ditions.

Under normal conditions the heated oxygen sensor 2 is not used for

engine control operation.

DTC Logic

INFOID:0000000004362105

DTC DETECTION LOGIC

The heated oxygen sensor 2 has a much longer switching time

between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-

gen storage capacity of the three way catalyst (manifold) causes the

longer switching time. To judge the malfunctions of heated oxygen

sensor 2, ECM monitors whether the switching response of the sen-

sor's voltage is faster than specified during various driving conditions

such as fuel-cut.

DTC CONFIRMATION PROCEDURE

INSPECTION START

Will CONSULT-III be used?
Will CONSULT-III be used?

YES

>> GO TO 2.

>> GO TO 5.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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:

For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30

°C (32 to 86 °F).

>> GO TO 3.

SEF327R

SEF302U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0139

Heated oxygen sensor 2
(bank 1) circuit slow re-
sponse

It takes more time for the sensor to respond be-
tween rich and lean than the specified time.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Heated oxygen sensor 2
• Fuel pressure
• Fuel injector
• Intake air leakage

P0159

Heated oxygen sensor 2
(bank 2) circuit slow re-
sponse

EC-1260

< COMPONENT DIAGNOSIS >

[VQ35DE]

P0139, P0159 HO2S2

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT-III

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

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

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

4. Turn ignition switch ON.

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

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

7. Let engine idle for 1 minute.

8. Open engine hood.

9. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with

CONSULT-III.

10. Follow the instruction of CONSULT-III display.

NOTE:

It will take at most 10 minutes until “COMPLETED” is displayed.

11. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?

>> INSPECTION END

>> Go to

EC-1262, "Diagnosis Procedure"

CANNOT BE DIAGNOSED>>GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE AGAIN

1. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).

2. Perform DTC confirmation procedure again.

>> GO TO 3.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to

EC-1260, "Component Function Check"

NOTE:

Use component function check to check the overall function of the heated oxygen sensor 2 circuit. During this

check, a 1st trip DTC might not be confirmed.
Is the inspection result normal?

YES

>> INSPECTION END

>> Go to

EC-1262, "Diagnosis Procedure"

Component Function Check

INFOID:0000000004362106

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSULT-III

1. Start engine and warm it up to the 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 1 minute under no load.

6. Let engine idle for 1 minute.

7. Check the voltage between ECM harness connector terminals

under the following conditions.

JMBIA1865ZZ

Content .. 532 533 534 535 ..