2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 1305 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0139 HO2S2
EC-191
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Diagnostic ProcedureEBS00B57
1.RETIGHTEN GROUND SCREWS
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground sc

Page 1306 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-192
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DTC P0139 HO2S2
3.CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect heated oxygen sensor 2 harness connector.
3. Check harness

Page 1307 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0139 HO2S2
EC-193
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3. Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)” as the monitor item with CONSULT-II.
4. Chec

Page 1308 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-194
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
PFP:16600
On Board Diagnosis LogicEBS00B5A
With the Air/Fuel Mixture Ratio Self-Learning C

EC-194
[QR (WITH EURO-OBD)]
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
PFP:16600
On Board Diagnosis LogicEBS00B5A
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 heated oxygen 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 light up the MI (2 trip detection logic).
DTC Confirmation ProcedureEBS00B5B
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 CONSUTL-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 toEC-197, "
Diagnostic Procedure".
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 toEC-197, "
Diagnostic 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.
Sensor Input Signal to ECMECM
functionActuator
Heated oxygen sensors 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injec-
tion controlFuel injectors
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P0171
0171Fuel injection system
too lean
lFuel injection system does not operate properly.
lThe amount of mixture ratio compensation is too
large.
(The mixture ratio is too lean.)
lIntake air leaks
lHeated oxygen sensor 1
lInjectors
lExhaust gas leaks
lIncorrect fuel pressure
lLack of fuel
lMass air flow sensor
lIncorrect PCV hose connection
SEF215Z

Page 1309 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-195
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3. Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 5 seconds

Page 1310 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-196
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram
EBS00B5C
TBWA0063E

Page 1311 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-197
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Diagnostic ProcedureEBS00B5D
1.CHECK EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for a

Page 1312 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual EC-198
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION
5.CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Check “MASS AIR FLOW” in “DATA MONITOR” mode

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