2008 NISSAN LATIO Service Repair Manual

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Page 1329 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0139 HO2S2
EC-255
< SERVICE INFORMATION >
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OK >> GO TO 5.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK HEATED OX

Page 1330 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-256
< SERVICE INFORMATION >
DTC P0139 HO2S2
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 50 (HO2S2 signal) and ground.
6. Check the voltage when revving up to 4,000

Page 1331 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-257
< SERVICE INFORMATION >
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION
On Board Diagnosis LogicINFOID:0000000001702760
With th

DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-257
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION
On Board Diagnosis LogicINFOID:0000000001702760
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 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 lights up the MIL (2 trip detection
logic).
DTC Confirmation ProcedureINFOID:0000000001702761
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-II
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-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II.
4. Clear the self-learning control coefficient by touching “CLEAR”.
5. Select “DATA MONITOR” mode with CONSULT-II.
6. Start engine again and let it idle for at least 10 minutes.
The 1st trip DTC P0171 should be detected at this stage, if a
malfunction exists. If so, go to EC-260, "
Diagnosis Procedure".
NOTE:
If 1st trip DTC is not detected during above procedure, perform-
ing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to
(1st trip) Freeze Frame Data for 10 minutes. Refer to the table
below.
Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.
Sensor Input Signal to ECM ECM function Actuator
Air fuel ratio (A/F) sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection control Fuel injector
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0171
0171Fuel 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
• Air fuel ratio (A/F) sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection
SEF215Z
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)

Page 1332 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-258
< SERVICE INFORMATION >
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
8. Crank engine while depress

EC-258
< SERVICE INFORMATION >
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-260, "
Diagnosis Procedure". If
engine does not start, check exhaust and intake air leak visually.
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Disconnect mass air flow sensor (1) harness connector.
4. Restart engine and let idle for at least 5 seconds.
5. Stop engine and reconnect mass air flow sensor (1) harness
connector.
6. Select Service $03 with GST. Make sure DTC P0102 is
detected.
7. Select Service $04 with GST and erase the DTC P0102.
8. Start engine again and let it idle for at least 10 minutes.
9. Select Service $07 with GST. The 1st trip DTC P0171 should be
detected at this stage, if a malfunction exists. If so, go to EC-
260, "Diagnosis Procedure".
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 min-
utes. Refer to the table below.
Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.
10. If it is difficult to start engine at step 8, the fuel injection system has a malfunction.
11. Crank engine while depressing accelerator pedal. If engine starts, go to EC-260, "
Diagnosis Procedure".
If engine does not start, check exhaust and intake air leak visually.
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).
BBIA0701E
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).

Page 1333 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-259
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Wiring DiagramINFOID:0000000001702762
Specification data are reference values and are measured b

Page 1334 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-260
< SERVICE INFORMATION >
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor

Page 1335 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-261
< SERVICE INFORMATION >
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1. Listen for an intake air leak after the mass air flow sensor.
2. Check PCV hose connection.
O

Page 1336 of 2771

NISSAN LATIO 2008 Service Repair Manual EC-262
< SERVICE INFORMATION >
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
1. Install all removed parts.
2. Start engine and warm it up to normal operating temperature.
3. Check mass air flow sensor sig

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