2010 NISSAN LATIO Service Repair Manual

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Page 1481 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-216
< COMPONENT DIAGNOSIS >[HR16DE]
P0139 HO2S2
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. Open

Page 1482 of 3745

NISSAN LATIO 2010 Service Repair Manual P0139 HO2S2EC-217
< COMPONENT DIAGNOSIS > [HR16DE]
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Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result no

Page 1483 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-218
< COMPONENT DIAGNOSIS >[HR16DE]
P0139 HO2S2
Wiring Diagram
INFOID:0000000005398392
Diagnosis ProcedureINFOID:0000000005398393
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check gro

Page 1484 of 3745

NISSAN LATIO 2010 Service Repair Manual P0139 HO2S2EC-219
< COMPONENT DIAGNOSIS > [HR16DE]
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YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the

Page 1485 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-220
< COMPONENT DIAGNOSIS >[HR16DE]
P0139 HO2S2
6.REPLACE HEATED OXYGEN SENSOR 2
Replace heated oxygen sensor 2.
CAUTION:
• Discard any sensor which has been dropped from a height of more than 0.

Page 1486 of 3745

NISSAN LATIO 2010 Service Repair Manual P0139 HO2S2EC-221
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5. Check the voltage between ECM harness connector and ground
under the following condition.
Is the inspection result

Page 1487 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-222
< COMPONENT DIAGNOSIS >[HR16DE]
P0139 HO2S2
• Before installing new sensor, clean exhaust system threads usi
ng Oxygen Sensor Thread Cleaner
[commercial service tool (J-43897-18 or J43897-12)

Page 1488 of 3745

NISSAN LATIO 2010 Service Repair Manual P0171 FUEL INJECTION SYSTEM FUNCTIONEC-223
< COMPONENT DIAGNOSIS > [HR16DE]
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P0171 FUEL INJECTION SYSTEM FUNCTION
DTC LogicINFOID:0000000005398395
DTC DETECTION LOGIC
Wi

P0171 FUEL INJECTION SYSTEM FUNCTIONEC-223
< COMPONENT DIAGNOSIS > [HR16DE]
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P0171 FUEL INJECTION SYSTEM FUNCTION
DTC LogicINFOID:0000000005398395
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 the A/F sensors 1. The ECM calcu-
lates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extrem ely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (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-27, "
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-225, "Diagnosis Procedure".
NO >> Check exhaust and intake air leak visually.
4.PERFORM DTC CONFIRMATION PROCEDURE-II
1. Start engine and let it idle for at least 5 minutes.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to EC-225, "Diagnosis Procedure".
NO >> GO TO 5.
Sensor Input signal to ECM ECM functionActuator
A/F sensor 1 Density of oxygen in exhaust gas
(Mixture ratio feedback signal) Fuel injection control Fuel injector
DTC No. Trouble diagnosis name
DTC detecting conditionPossible cause
P0171 Fuel injection system too
lean • 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
Revision: January 20102010 Versa

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