2003 NISSAN X-TRAIL Service Repair Manual

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Page 593 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0139 HO2S2
EC-215
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6. Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to ±25%.
“HO2S2 (B1)” should be above 0.68V at

DTC P0139 HO2S2
EC-215
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6. Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to ±25%.
“HO2S2 (B1)” should be above 0.68V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)” should be below 0.50V at least once when the “FUEL INJECTION” is −25%.
CAUTION:
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Without CONSULT-II
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
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. Set voltmeter probes between ECM terminal 16 (HO2S2 signal) and ground.
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.68V at least once during this
procedure.
If the voltage is above 0.68V at step 6, step 7 is not neces-
sary.
7. Keep vehicle idling for 10 minutes, then check voltage. Or check
the voltage when coasting from 80 km/h (50 MPH) in D position
with “OD” OFF (A/T), 3rd gear position (M/T).
The voltage should be below 0.50V at least once during this
procedure.
8. If NG, replace heated oxygen sensor 2.
CAUTION:
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7
in) onto a hard surface such as a concrete floor; use a new one.
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
Removal and InstallationEBS010P2
HEATED OXYGEN SENSOR 2
Refer to EX-2, "EXHAUST SYSTEM" .
PBIB0551E
MBIB0020E

Page 594 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-216
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION

DTC P0171 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS010P3
With the Air-Fuel Mixture Ratio Self-Learning

EC-216
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION

DTC P0171 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS010P3
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 lights up the MI (2 trip detection logic).
DTC Confirmation ProcedureEBS010P4
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-219, "
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 to EC-219, "
Diagnostic Procedure" . If engine does not
start, check exhaust and intake air leak visually.
Sensor Input Signal to ECM ECM function Actuator
Heated oxygen 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
Heated oxygen sensor 1
Fuel injector
Exhaust gas leaks
Incorrect fuel pressure
Lack of fuel
Mass air flow sensor
Incorrect PCV hose connection
SEF215Z

Page 595 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-217
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WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF a

Page 596 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-218
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION

Wiring DiagramEBS010P5
TBWA0604E

Page 597 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-219
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Diagnostic ProcedureEBS010P6
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen fo

Page 598 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-220
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION

4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-48, "
FUEL PRESSURE RELEASE" .
2. Install fuel pressure gaug

Page 599 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-221
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6. CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Perform “POWER BALANCE” in “A

Page 600 of 4179

NISSAN X-TRAIL 2003 Service Repair Manual EC-222
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DTC P0171 FUEL INJECTION SYSTEM FUNCTION

8. CHECK INTERMITTENT INCIDENT
Refer to EC-123, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END

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