2006 INFINITI FX35 Service Manual

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Page 1697 of 4462

INFINITI FX35 2006 Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-313
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Revision: 2006 December 2006 FX35/FX45
4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero.

Page 1698 of 4462

INFINITI FX35 2006 Service Manual EC-314
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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 December 2006 FX35/FX45
7. CHECK FUNCTION OF FUEL INJECTOR
With CONSULT-II
1. Start engine.
2. Perform “POWER BALA

Page 1699 of 4462

INFINITI FX35 2006 Service Manual DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION EC-315
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Revision: 2006 December 2006 FX35/FX45
8. CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT-I

Page 1700 of 4462

INFINITI FX35 2006 Service Manual EC-316
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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 December 2006 FX35/FX45
9. CHECK FUNCTION OF FUEL INJECTOR-II
Provide battery voltage between harness connector F251 as

Page 1701 of 4462

INFINITI FX35 2006 Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION EC-317
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Revision: 2006 December 2006 FX35/FX45
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
O

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION EC-317
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Revision: 2006 December 2006 FX35/FX45
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTIONPFP:16600
On Board Diagnosis LogicNBS003P8
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 air fuel ratio (A/F) 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 rich.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
DTC Confirmation ProcedureNBS003P9
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-323, "
Diagnostic Proce-
dure" .
NOTE:
If 1st trip DTC is not detected during above procedure, perform-
ing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below.
Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.
7. If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
Sensor Input signal to ECM ECM function Actuator
Air fuel ration (A/F) sensor 1 Density of oxygen in exhaust gas
(Mixture ratio feedback signal) Fuel injection
control Fuel 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.)
Air fuel ratio (A/F) sensor 1
Fuel injector
Exhaust gas leaks
Incorrect fuel pressure
Mass air flow sensor
P0175
0175
(Bank 2)
SEF968Y
Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Engine coolant temperature
(T) condition When the freeze frame data shows lower than 70
°C (158 °F),
T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).

Page 1702 of 4462

INFINITI FX35 2006 Service Manual EC-318
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DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 December 2006 FX35/FX45
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-323, "
Diagnosti

EC-318
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DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 December 2006 FX35/FX45
8. Crank engine while depressing accelerator pedal. If engine starts, go to EC-323, "
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 Service $03 with GST. Make sure DTC P0102 is detected.
6. Select Service $04 with GST and erase the DTC P0102.
7. Start engine again and let it idle for at least 10 minutes.
8. Select Service $07 with GST. The 1st trip DTC P0172 or P0175 should be detected at this stage, if a malfunction exists. If so, go
to EC-323, "
Diagnostic Procedure" .
NOTE:
If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
a. Turn ignition switch OFF and wait at least 10 seconds.
b. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for a certain time. Refer to the table below.
Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following con-
ditions should be satisfied at the same time.
9. If it is difficult to start engine at step 7, the fuel injection system has a malfunction.
10. Crank engine while depressing accelerator pedal. If engine starts, go to EC-323, "
Diagnostic Procedure" . If engine does not start, remove ignition plugs and
check for fouling, etc.
PBIB1565E
Engine speed Engine speed in the freeze frame data ± 400 rpm
Vehicle speed Vehicle speed in the freeze frame data ± 10 km/h (6 MPH)
Engine coolant temperature
(T) condition When the freeze frame data shows lower than 70
°C (158 °F),
T should be lower than 70 °C (158 °F).
When the freeze frame data shows higher than or equal to 70 °C (158 °F),
T should be higher than or equal to 70 °C (158 °F).

Page 1703 of 4462

INFINITI FX35 2006 Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION EC-319
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Revision: 2006 December 2006 FX35/FX45
Wiring DiagramNBS003PA
BANK 1
TBWM1384E

Page 1704 of 4462

INFINITI FX35 2006 Service Manual EC-320
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DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 December 2006 FX35/FX45
Specification data are reference values and are measured between each terminal and ground.
Pulse

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