2004 INFINITI QX56 Factory Service Manual

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Page 1401 of 3371

INFINITI QX56 2004 Factory Service Manual EC-210Revision: August 2007
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
2004 QX56
Wiring DiagramUBS00H2Y
BANK 1
BBWA11 62 E

Page 1402 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
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BANK 2
BBWA11 63 E

Page 1403 of 3371

INFINITI QX56 2004 Factory Service Manual EC-212Revision: August 2007
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
2004 QX56
Diagnostic ProcedureUBS00H2Z
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaus

Page 1404 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
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3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect co

Page 1405 of 3371

INFINITI QX56 2004 Factory Service Manual EC-214Revision: August 2007
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
2004 QX56
4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-46, "
FUEL PRESSURE RELEASE" .
2. Install fu

Page 1406 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
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7. CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Perform “POWER BAL

Page 1407 of 3371

INFINITI QX56 2004 Factory Service Manual EC-216Revision: August 2007
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
2004 QX56
9. CHECK INTERMITTENT INCIDENT
Refer to EC-127, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
>>INSPECTION END

Page 1408 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicUBS00H3

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicUBS00H30
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 A/F sensor 1. The ECM calcu-
lates 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 lights up the MIL (2 trip detection logic).
DTC Confirmation ProcedureUBS00H31
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, P0175 should be detected at this stage,
if a malfunction exists. If so, go to EC-221, "
Diagnostic Proce-
dure" .
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-221, "
Diagnostic Procedure" .
If engine does not start, remove spark plugs and check for foul-
ing, etc.
Sensor Input signal to ECM ECM function Actuator
Heated oxygen sensors 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection
controlFuel injector
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0172
0172
(Bank 1)
Fuel 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.)
A/F sensor 1
Injector
Exhaust gas leaks
Incorrect fuel pressure
Mass air flow sensor P0175
0175
(Bank 2)
SEF 9 68 Y

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