2010 NISSAN LATIO Service Repair Manual

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Page 1473 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-208
< COMPONENT DIAGNOSIS >[HR16DE]
P0138 HO2S2
Without CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Star

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NISSAN LATIO 2010 Service Repair Manual P0138 HO2S2EC-209
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Wiring DiagramINFOID:0000000005398386
Diagnosis ProcedureINFOID:0000000005398387
1.INSPECTION START
Confirm the detec

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NISSAN LATIO 2010 Service Repair Manual EC-210
< COMPONENT DIAGNOSIS >[HR16DE]
P0138 HO2S2
A>>GO TO 2.
B>>GO TO 9.
2.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections E15, E24. Refer to EC-119, "
Ground Inspe

Page 1476 of 3745

NISSAN LATIO 2010 Service Repair Manual P0138 HO2S2EC-211
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Refer to
EC-212, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.REPLACE H

P0138 HO2S2EC-211
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Refer to
EC-212, "Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 7.
7.REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
CAUTION:
• Discard any sensor which has been dropped from a he ight 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 syst em threads using Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)] and approved Anti-seize Lubricant (commercial
service tool).
>> INSPECTION END
8.CHECK INTERMITTENT INCIDENT
Refer to EC-114, "
Diagnosis Procedure".
>> INSPECTION END
9.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections E15, E24. Refer to EC-119, "
Ground Inspection".
Is the inspection result normal?
YES >> GO TO 10.
NO >> Repair or replace ground connection.
10.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. Refer to EC-27, "
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 P0172 detected? Is it difficult to start engine?
YES >> Perform trouble diagnosis for DTC P0172. Refer to EC-229, "DTC Logic".
NO >> GO TO 11.
11 .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 HO2S2 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 12.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
12.CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Check the continuity between HO2S2 harness connector and ECM harness connector.
HO2S2ECM
Continuity
Connector Terminal Connector Terminal
F13 1 F11 59 Existed
Revision: January 20102010 Versa

Page 1477 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-212
< COMPONENT DIAGNOSIS >[HR16DE]
P0138 HO2S2
2. Check the continuity between HO2S2 harne
ss connector or ECM harness connector and ground.
3. Also check harness for short to power.
Is the inspec

Page 1478 of 3745

NISSAN LATIO 2010 Service Repair Manual P0138 HO2S2EC-213
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5. Let engine idle for 1 minute.
6. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select “HO2S2 (B1)�

Page 1479 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-214
< COMPONENT DIAGNOSIS >[HR16DE]
P0138 HO2S2
5.CHECK HEATED OXYGEN SENSOR 2-III
Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result

Page 1480 of 3745

NISSAN LATIO 2010 Service Repair Manual P0139 HO2S2EC-215
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P0139 HO2S2
DescriptionINFOID:0000000005398389
The heated oxygen sensor 2, after three way catalyst (manifold),
monit

P0139 HO2S2EC-215
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P0139 HO2S2
DescriptionINFOID:0000000005398389
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 LogicINFOID:0000000005398390
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 the various driving condi-
tion such as fuel-cut.
DTC CONFIRMATION PROCEDURE
1.INSPECTION START
Do you have CONSULT-III?
Do you have CONSULT-III?
YES >> GO TO 2.
NO >> GO TO 5.
2.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 3.
3.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 normal operating temperature.
SEF327R
SEF302U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0139 Heated oxygen sensor 2
circuit slow response It takes more time for the sensor to respond
between 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 leaks
Revision: January 20102010 Versa

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