2003 NISSAN ALMERA N16 Electronic Repair Manual

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Page 521 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual DTC P0171 FUEL INJECTION SYSTEM FUNCTION
EC-191
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6.CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Perform “POWER BALANCE” in “A

Page 522 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual EC-192
[QG (WITH EURO-OBD)]
DTC P0171 FUEL INJECTION SYSTEM FUNCTION
8. CHECK INTERMITTENT INCIDENT
Refer to EC-109, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END

Page 523 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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DTC P0172 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS00K6U
With the Air/Fuel M

DTC P0172 FUEL INJECTION SYSTEM FUNCTION
EC-193
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DTC P0172 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicEBS00K6U
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 ProcedureEBS00K6V
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-196, "
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-196, "
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.
3. Disconnect mass air flow sensor harness connector. Then
restart and run engine for at least 5 seconds at idle speed.
4. Stop engine and reconnect mass air flow sensor harness con-
nector.
5. Select “MODE 3” with GST. Make sure DTC P0102 is detected.
6. Select “MODE 4” with GST and erase the DTC P0102.
7. Start engine again and let it idle for at least 10 minutes.
8. Select “MODE 7” with GST. The 1st trip DTC P0172 should be
detected at this stage, if a malfunction exists. If so, go to EC-
196, "Diagnostic Procedure" .
Sensor Input Signal to ECM ECM function Actuator
Heated oxygen sensors 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection control Fuel injectors
DTC No. Trouble diagnosis name DTC 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
MBIB0096E

Page 524 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual EC-194
[QG (WITH EURO-OBD)]
DTC P0172 FUEL INJECTION SYSTEM FUNCTION
9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
10. Crank engine while depressing acc

Page 525 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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Wiring DiagramEBS00K6W
YEC285A

Page 526 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual EC-196
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
EBS00K6X
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak befor

Page 527 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual DTC P0172 FUEL INJECTION SYSTEM FUNCTION
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5.CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Check “MASS AIR FLOW” i

Page 528 of 3189

NISSAN ALMERA N16 2003 Electronic Repair Manual EC-198
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DTC P0172 FUEL INJECTION SYSTEM FUNCTION
7. CHECK INJECTOR
1. Remove injector assembly. Refer to EM-26, "
FUEL INJECTOR AND FUEL TUBE" .
Keep fuel hose and all inje

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