2004 INFINITI FX35 Service Manual

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Page 1601 of 4449

INFINITI FX35 2004 Service Manual EC-260
[VQ35DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Revision: 2004 November 2004 FX35/FX45
Diagnostic ProcedureABS006P1
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Lis

Page 1602 of 4449

INFINITI FX35 2004 Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2004 November 2004 FX35/FX45
3. CHECK HEATED OXYGEN SENSOR 1 CIRCUIT FOR OPEN AND SHORT
1. Turn igni

Page 1603 of 4449

INFINITI FX35 2004 Service Manual EC-262
[VQ35DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Revision: 2004 November 2004 FX35/FX45
5. DETECT MALFUNCTIONING PART
Check the following.
Fuel pump and circuit (Refer to EC-603 .)
Fu

Page 1604 of 4449

INFINITI FX35 2004 Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2004 November 2004 FX35/FX45
7. CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Per

Page 1605 of 4449

INFINITI FX35 2004 Service Manual EC-264
[VQ35DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Revision: 2004 November 2004 FX35/FX45
9. CHECK INTERMITTENT INCIDENT
Refer to EC-135, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .

Page 1606 of 4449

INFINITI FX35 2004 Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2004 November 2004 FX35/FX45
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagn

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2004 November 2004 FX35/FX45
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicABS006P2
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 lights up the MIL (2 trip detection logic).
DTC Confirmation ProcedureABS006P3
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-269, "
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-269, "
Diagnostic Procedure" . If engine
does not start, remove spark plugs and check for fouling, etc.
Sensor Input signal to ECM ECM function Actuator
Heated oxygen sensor 1Density of oxygen in exhaust gas
(Mixture ratio feedback signal)Fuel injection
controlFuel injector
DTC No.Trouble diagnosis
nameDTC 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.)
Heated oxygen sensor 1
Fuel injector
Exhaust gas leaks
Incorrect fuel pressure
Mass air flow sensor P0175
0175
(Bank 2)
SEF968Y

Page 1607 of 4449

INFINITI FX35 2004 Service Manual EC-266
[VQ35DE]
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2004 November 2004 FX35/FX45
WITH GST
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch

Page 1608 of 4449

INFINITI FX35 2004 Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2004 November 2004 FX35/FX45
Wiring DiagramABS006P4
BANK 1
TBWM0294E

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