2008 NISSAN TEANA sensor

P0139, P0159 HO2S2
EC-193
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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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. 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. Open engine hood.
7. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-III.
8. Follow the instruction of CONSULT-III.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
9. Touch “SELF-DIAG RESULTS”.
Which is displayed on CONSULT-III screen?
OK >> INSPECTION END
NG >> Go to EC-194, "
Diagnosis Procedure".
CAN NOT BE DIAGNOSED>>GO TO 4.
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.
5.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to EC-193, "
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
NO >> Go to EC-194, "
Diagnosis Procedure".
Component Function CheckINFOID:0000000003856589
1.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. 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.
5. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 2.
2.PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connector terminals under the following conditions.
DTCECM
Condition Voltage
Connec-
tor+–
Te r m i n a l Te r m i n a l
P0139
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Revving up to 4,000 rpm under no
load at least 10 timesA change of voltage should be more
than 0.12 V for 1 second during this
procedure.
P015934
[HO2S2 (bank 2)
signal]

EC-194
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0139, P0159 HO2S2
.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 3.
3.PERFORM COMPONENT FUNCTION CHECK-III
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Go to EC-194, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003856590
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E38. Refer to Ground Inspection in GI-37, "
Circuit Inspection".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CLEAR MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to EC-18, "
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 EC-198, "DTC Logic"
or EC-202, "DTC Logic".
NO >> GO TO 3.
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between heated oxygen sensor 2 (HO2S2) harness connector and ECM harness
connector.
DTCECM
Condition Voltage
Connec-
tor+–
Te r m i n a l Te r m i n a l
P0139
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Keeping engine at idle for 10 minutesA change of voltage should be more
than 0.12 V for 1 second during this
procedure.
P015934
[HO2S2 (bank 2)
signal]
DTCECM
Condition Voltage
Connec-
tor+–
Terminal Terminal
P0139
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Coasting from 80 km/h (50 MPH) in
D positionA change of voltage should be more
than 0.12 V for 1 second during this
procedure.
P015934
[HO2S2 (bank 2)
signal]

P0139, P0159 HO2S2
EC-195
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
2. Check the continuity between HO2S2 harness connector or ECM harness connector and ground.
3. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK HEATED OXYGEN SENSOR 2
Refer to EC-195, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
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 and approved anti-seize lubricant.
>> INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Refer to GI-35, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000003856591
1.INSPECTION START
Will CONSULT-III be used?
DTCHO2S2 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0139 1 F70 1
F8 35 Existed
P0159 2 F71 1
DTCHO2S2 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0139 1 F70 4
F833
Existed
P0159 2 F71 4 34
DTCHO2S2 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0139 1 F70 4
F833
Ground Not existed
P0159 2 F71 4 34

EC-196
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0139, P0159 HO2S2
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK HEATED OXYGEN SENSOR 2
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. 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-III.
7. Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to ±25%.
“HO2S2 (B1)/(B2)” should be above 0.68 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
NO >> GO TO 6.
3.CHECK HEATED OXYGEN SENSOR 2-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. 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.
5. Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 4.
4.CHECK HEATED OXYGEN SENSOR 2-II
Check the voltage between ECM harness connector terminals under the following conditions.
PBIB3458E
ECM
Condition Voltage
Connector+–
Terminal Terminal
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Revving up to 4,000 rpm under no load at
least 10 timesThe 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. 34
[HO2S2 (bank 2)
signal]

P0139, P0159 HO2S2
EC-197
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 5.
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
NO >> GO TO 6.
6.REPLACE HEATED OXYGEN SENSOR 2
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 and approved anti-seize lubricant.
>> INSPECTION END
ECM
Condition Voltage
Connector+–
Terminal Terminal
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Keeping engine at idle for 10 minutesThe 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. 34
[HO2S2 (bank 2)
signal]
ECM
Condition Voltage
Connector+–
Terminal Terminal
F833
[HO2S2 (bank 1)
signal]35
(Sensor
ground)Coasting from 80 km/h (50 MPH) in D po-
sitionThe 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. 34
[HO2S2 (bank 2)
signal]

EC-198
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
DTC LogicINFOID:0000000003856592
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from A/F sensor 1. The ECM calculates
the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (the actual mixture ratio is too lean), the
ECM judges the condition as the fuel injection system malfunction and illuminates the MI (2 trip detection
logic).
DTC CONFIRMATION PROCEDURE
1.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.
2.PERFORM DTC CONFIRMATION PROCEDURE-I
1. Clear the mixture ratio self-learning value. Refer to EC-18, "
MIXTURE RATIO SELF-LEARNING VALUE
CLEAR : Special Repair Requirement".
2. Start engine.
Is it difficult to start engine?
YES >> GO TO 3.
NO >> GO TO 4.
3.RESTART ENGINE
If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal.
NOTE:
When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the
engine. Do not depress accelerator pedal too much.
Does engine start?
YES >> Go to EC-199, "Diagnosis Procedure".
NO >> Check exhaust and intake air leak visually.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Keep engine idle for at least 10 minutes.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-199, "Diagnosis Procedure".
NO >> GO TO 5.
Sensor Input signal to ECM ECM function Actuator
A/F sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection control Fuel injector
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0171Fuel injection system too
lean (bank 1)
 Fuel injection system does not operate properly.
 The amount of mixture ratio compensation is too
large. (The mixture ratio is too lean.) Intake air leaks
 A/F sensor 1
 Fuel injector
 Exhaust gas leaks
 Incorrect fuel pressure
 Lack of fuel
 Mass air flow sensor
 Incorrect PCV hose connection P0174Fuel injection system too
lean (bank 2)

P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-199
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
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5.PERFORM DTC CONFIRMATION PROCEDURE-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and drive the vehicle under similar conditions to (1st trip) Freeze Frame Data for 10 minutes.
Refer to the table below.
Hold the accelerator pedal as steady as possible.
Similar conditions to (1st trip) Freeze Frame Data mean that the following conditions should be satisfied at
the same time.
3. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-199, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000003856593
1.CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before three way catalyst (manifold).
Is exhaust gas leak detected?
YES >> Repair or replace malfunctioning part.
NO >> GO TO 2.
2.CHECK FOR INTAKE AIR LEAK
1. Listen for an intake air leak after the mass air flow sensor.
2. Check PCV hose connection.
Is intake air leak detected?
YES >> Repair or replace malfunctioning part.
NO >> GO TO 3.
3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1 harness connector.
3. Disconnect ECM harness connector.
4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.
Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Engine coolant temperature (T) conditionWhen the freeze frame data shows lower than 70 °C (158 °F),
T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).
PBIB1216E

EC-200
< COMPONENT DIAGNOSIS >[VQ25DE, VQ35DE]
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
5. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.
6. Also check harness for short to power.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit, short to ground or short to power in harness or connectors.
4.CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-411, "
Inspection".
2. Install fuel pressure gauge and check fuel pressure. Refer to EC-411, "
Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal?
YES >> Replace “fuel filter and fuel pump assembly”.
NO >> Repair or replace malfunctioning part.
6.CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-III.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in Service $01 with GST.
For specification, refer to EC-414, "
Mass Air Flow Sensor".
Is the measurement value within the specification?
YES >> GO TO 7.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or
ground. Refer to EC-150, "
Diagnosis Procedure".
7.CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-III
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT-III.
DTCA/F sensor 1 ECM
Continuity
Bank Connector Terminal Connector Terminal
P0171 1 F271
F845
Existed 249
P0174 2 F64153
257
DTCA/F sensor 1 ECM
Ground Continuity
Bank Connector Terminal Connector Terminal
P0171 1 F271
F845
Ground Not existed 249
P0174 2 F64153
257
At idling: Approximately 350 kPa (3.50 bar, 3.57 kg/cm2, 51 psi)