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Nissan Altima L32. Manual - part 279

P0143 HO2S3

EC-237

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

6. Check “HO2S3 (B1)” at idle speed when adjusting “FUEL INJECTION” to

±25%.

“HO2S3 (B1)” should be above 0.68V at least once when the “FUEL INJECTION” is +25%.

“HO2S3 (B1)” should be below 0.18V at least once when the “FUEL INJECTION” is

−25%.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

CHECK HEATED OXYGEN SENSOR 3-I

Without CONSULT-III

CAUTION:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

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 the engine and drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive min-

utes.

NOTE:

Keep the vehicle speed as steady as possible during the cruising.

4. Check the voltage between ECM harness connector and ground

under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 4.

CHECK HEATED OXYGEN SENSOR 3-II

1. Keep vehicle at idling for 10 minutes.

2. Check the voltage between ECM harness connector and ground

under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

PBIB3458E

ECM

Groun

Condition

Voltage

Connec-

tor

Terminal

F13

(HO2S3

signal)

Groun

Revving up to
4,000 rpm un-
der no load at
least 10 times

The voltage should be above
0.68 V at least once during this
procedure.
The voltage should be below
0.18 V at least once during this
procedure.

JMBIA1589ZZ

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S3

signal)

Ground

Revving up to
4,000 rpm un-
der no load at
least 10 times

The voltage should be above
0.68 V at least once during this
procedure.
The voltage should be below
0.18 V at least once during this
procedure.

JMBIA1589ZZ

EC-238

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0143 HO2S3

>> GO TO 5.

CHECK HEATED OXYGEN SENSOR 3-III

Check the voltage between ECM harness connector and ground

under the following condition.

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 6.

REPLACE HEATED OXYGEN SENSOR 3

Replace heated oxygen sensor 3.

CAUTION:

• Discard any 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 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

ECM

Ground

Condition

Voltage

Connector

Terminal

F13

(HO2S3

signal)

Ground

Coasting from 80
km/h (50 MPH) in
D position (CVT),
4th gear position
(M/T)

The voltage should be
above 0.68 V at least once
during this procedure.
The voltage should be be-
low 0.18 V at least once
during this procedure.

JMBIA1590ZZ

P0144 HO2S3

EC-239

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0144 HO2S3

Description

INFOID:0000000004349281

The heated oxygen sensor 3, after HC adsorption catalyst (Under

floor), monitors the oxygen level in the exhaust gas on each bank.

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

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

tions.

Under normal conditions the heated oxygen sensor 3 is not used for

engine control operation.

DTC Logic

INFOID:0000000004349282

DTC DETECTION LOGIC

The heated oxygen sensor 3 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 3, ECM monitors whether the maximum voltage of the sensor

is sufficiently high during the various driving condition such as fuel-

cut.

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

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

2. Repeat the following procedure 3 times.

Drive vehicle at a speed of 80 km/h (50 MPH) or more for at least 3 consecutive minutes.

CAUTION:

Always drive vehicle in safe manner according to traffic conditions and obey all traffic laws.

NOTE:

•

Keep the vehicle speed as steady as possible during the cruising.

•

Never raise engine sped above 3,600 rpm in this step.

Release accelerator pedal fully and stop vehicle with engine running.

NOTE:

SEF327R

SEF259VA

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0144

Heated oxygen sensor 3
circuit low voltage

The maximum voltage from the sensor is not
reached to the specified voltage.

• Harness or connectors

(The sensor circuit is open or shorted)

• Heated oxygen sensor 3
• Fuel pressure
• Fuel injector
• Intake air leaks

EC-240

< COMPONENT DIAGNOSIS >

[QR25DE FOR CALIFORNIA]

P0144 HO2S3

Never turn ignition switch OFF.

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Go to

EC-240, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000004349283

CHECK GROUND CONNECTION

1. Turn ignition switch OFF.

2. Check ground connection E9. Refer to Ground Inspection in

GI-45, "Circuit Inspection"

Is the inspection result normal?

YES

>> GO TO 2.

>> Repair or replace ground connection.

CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE

1. Clear the mixture ratio self-learning value. Refer to

EC-32, "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 or P0172 detected? Is it difficult to start engine?

YES

>> Perform trouble diagnosis for DTC P0171 or P0172. Refer to

EC-254, "DTC Logic"

EC-258,

"DTC Logic"

>> GO TO 3.

CHECK HO2S3 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect heated oxygen sensor 3 harness connector.

3. Disconnect ECM harness connector.

4. Check the continuity between HO2S3 harness connector and ECM harness connector.

5. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors F58, F101

• Harness for open or short between heated oxygen sensor 3 and ECM

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HO2S3 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check the continuity between HO2S3 harness connector and ECM harness connector.

2. Check the continuity between HO2S3 harness connector or ECM harness connector and ground.

HO2S3

ECM

Continuity

Connector

Terminal

Connector

Terminal

F102

F13

Existed

HO2S3

ECM

Continuity

Connector

Terminal

Connector

Terminal

F102

F13

Existed

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