2010 NISSAN LATIO Service Repair Manual

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Page 2025 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-760
< SERVICE INFORMATION >[MR18DE]
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram
INFOID:0000000005532599
Specification data are reference values and are measured between each terminal an

Page 2026 of 3745

NISSAN LATIO 2010 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-761
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Do not use ECM ground terminals wh
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Page 2027 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-762
< SERVICE INFORMATION >[MR18DE]
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
1. Listen for an intake air leak after the mass air flow sensor.
2. Check PCV hose connection.
OK or NG
OK >> GO TO 3.
N

Page 2028 of 3745

NISSAN LATIO 2010 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-763
< SERVICE INFORMATION > [MR18DE]
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1. Install all removed parts.
2. Start engine and warm it up to normal operating temper

Page 2029 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-764
< SERVICE INFORMATION >[MR18DE]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
On Board Diagn
osis LogicINFOID:0000000005532601
With the Air/Fuel Mixture Rati

EC-764
< SERVICE INFORMATION >[MR18DE]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
On Board Diagn
osis LogicINFOID:0000000005532601
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 air fuel ratio (A/F) sensor 1. The
ECM calculates the necessary compensation to corr ect 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 rich.),
the ECM judges the condition as the fuel injection sy stem malfunction and lights up the MIL (2 trip detection
logic).
DTC Confirmation ProcedureINFOID:0000000005532602
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH 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. Turn ignition switch ON and select “SELF-LE ARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-III.
4. Clear the self-learning control coefficient by touching “CLEAR”.
5. Start engine. If it is difficult to start engine, the fuel injection system has a malfunction.
Perform the following procedure is advised.
a. 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.
b. If engine starts, go to EC-767, "
Diagnosis Procedure".
If engine does not start, remove ignition plugs and check for fouling, etc.
6. Keep engine at idle for at least 5 minutes.
7. Check 1st trip DTC. The 1st trip DTC P0172 should be detected at this stage, if a malfunction exists. If so, go to EC-767,
"Diagnosis Procedure".
NOTE:
If 1st trip DTC is not detected during above proc edure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine.
c. Maintain the following conditions for at least 10 consecutive minutes. Hold the accelerator pedal as steady as possible.
Sensor Input Signal to ECM ECM functionActuator
Air fuel ratio (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
0172 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.) • Air fuel ratio (A/F) sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Mass air flow sensor
VHCL SPEED SE
50 – 120 km/h (31 – 75 MPH)
Revision: January 20102010 Versa

Page 2030 of 3745

NISSAN LATIO 2010 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-765
< SERVICE INFORMATION > [MR18DE]
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CAUTION:
Always drive vehicle at a safe speed.
d. Check 1st trip DTC.
e. If 1st trip DT

Page 2031 of 3745

NISSAN LATIO 2010 Service Repair Manual EC-766
< SERVICE INFORMATION >[MR18DE]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram
INFOID:0000000005532603
Specification data are reference values and are measured between each terminal an

Page 2032 of 3745

NISSAN LATIO 2010 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-767
< SERVICE INFORMATION > [MR18DE]
C
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G H
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K L
M A
EC
NP
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Do not use ECM ground terminals wh
en measuring input/output voltage. Doing so may resu

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