2010 NISSAN LATIO Service Repair Manual

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Page 1489 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-224
< COMPONENT DIAGNOSIS >[HR16DE]
P0171 FUEL INJECTION SYSTEM FUNCTION
5.PERFORM DTC CONFIRMATION PROCEDURE-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine.
3. Maint

Page 1490 of 3745

NISSAN LATIO 2010 Service Repair Manual P0171 FUEL INJECTION SYSTEM FUNCTIONEC-225
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Wiring DiagramINFOID:0000000005398396
Diagnosis ProcedureINFOID:0000000005398397
1.CHECK EXH

Page 1491 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-226
< COMPONENT DIAGNOSIS >[HR16DE]
P0171 FUEL INJECTION SYSTEM FUNCTION
2. Listen for an exhaust gas leak before three way catalyst (manifold).
Is exhaust gas leak detected?
YES >> Repair or repla

Page 1492 of 3745

NISSAN LATIO 2010 Service Repair Manual P0171 FUEL INJECTION SYSTEM FUNCTIONEC-227
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NO >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
I

Page 1493 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-228
< COMPONENT DIAGNOSIS >[HR16DE]
P0171 FUEL INJECTION SYSTEM FUNCTION
7. Crank engine for about 3 seconds.
Is the inspection result normal?
YES >> GO TO 9.
NO >> Replace fuel injectors from whic

Page 1494 of 3745

NISSAN LATIO 2010 Service Repair Manual P0172 FUEL INJECTION SYSTEM FUNCTIONEC-229
< COMPONENT DIAGNOSIS > [HR16DE]
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P0172 FUEL INJECTION SYSTEM FUNCTION
DTC LogicINFOID:0000000005398398
DTC DETECTION LOGIC
Wi

P0172 FUEL INJECTION SYSTEM FUNCTIONEC-229
< COMPONENT DIAGNOSIS > [HR16DE]
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P0172 FUEL INJECTION SYSTEM FUNCTION
DTC LogicINFOID:0000000005398398
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 rich.), 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-231, "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-231, "Diagnosis Procedure".
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine.
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 condition Possible cause
P0172 Fuel injection system too
rich • Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too
large. (The mixture ratio is too rich.) • A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Mass air flow sensor
Revision: January 20102010 Versa

Page 1495 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-230
< COMPONENT DIAGNOSIS >[HR16DE]
P0172 FUEL INJECTION SYSTEM FUNCTION
3. Maintain the following conditions for at least 10 consecutive minutes.
Hold the accelerator pedal as steady as possible.

Page 1496 of 3745

NISSAN LATIO 2010 Service Repair Manual P0172 FUEL INJECTION SYSTEM FUNCTIONEC-231
< COMPONENT DIAGNOSIS > [HR16DE]
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Wiring DiagramINFOID:0000000005398399
Diagnosis ProcedureINFOID:0000000005398400
1.CHECK EXH

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