2001 NISSAN X-TRAIL Service Repair Manual

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Page 553 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-203
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Diagnostic ProcedureEBS00M4P
1.CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for

Page 554 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-204
[QR25(WITH EURO-OBD)]
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” mod

Page 555 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-205
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7.CHECK INJECTOR
1. Confirm that the engine is cooled down and there are no fire hazards near the vehicl

Page 556 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-206
[QR25(WITH EURO-OBD)]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
PFP:16600
On Board Diagnosis LogicEBS00M4Q
With the Air-Fuel Mixture Ratio Self-Lear

EC-206
[QR25(WITH EURO-OBD)]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
PFP:16600
On Board Diagnosis LogicEBS00M4Q
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 sensors 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 rich.), the
ECM judges the condition as the fuel injection system malfunction and light up the MI (2 trip detection logic).
DTC Confirmation ProcedureEBS00M4R
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 P0172 should be detected at this stage, if a
malfunction exists. If so, go to EC-209, "
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-209, "
Diagnostic Procedure" . If engine
does not start, remove ignition plugs and check for fouling, etc.
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
P0172
0172Fuel 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.)
●Heated oxygen sensor 1
●Injectors
●Exhaust gas leaks
●Incorrect fuel pressure
●Mass air flow sensor
SEF215Z

Page 557 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-207
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3. Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 5

Page 558 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-208
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Wiring Diagram
EBS00M4S
TBWA0063E

Page 559 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-209
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Diagnostic ProcedureEBS00M4T
1.CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for

Page 560 of 3833

NISSAN X-TRAIL 2001 Service Repair Manual EC-210
[QR25(WITH EURO-OBD)]
DTC P0172 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” mod

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