Infiniti FX35 / FX45. Manual — part 525
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-861
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DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
On Board Diagnosis Logic
INFOID:0000000001326698
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 lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
DTC Confirmation Procedure
INFOID:0000000001326699
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-III
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-III.
4.
Clear the self-learning control coefficient by touching “CLEAR”.
5.
Start engine.
If it is difficult to start engine, the fuel injection system has a malfunction.
Perform the following procedure is advised.
a.
Crank engine while depressing accelerator pedal.
b.
If engine starts, go to
.
If engine does not start, check exhaust and intake air leak visually.
6.
Keep engine at idle for at least 10 minutes.
7.
Check 1st trip DTC.
8.
If 1st trip DTC is detected, go to
If 1st trip DTC is not detected, 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 10 min-
utes. 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.
Sensor
Input Signal to ECM
ECM function
Actuator
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
P0171
0171
(Bank 1)
Fuel injection system too
lean
• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too
large. (The mixture ratio is too lean.)
• Intake air leaks
• A/F sensor 1
• Fuel injector
• Exhaust gas leaks
• Incorrect fuel pressure
• Lack of fuel
• Mass air flow sensor
• Incorrect PCV hose connection
P0174
0174
(Bank 2)
EC-862
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[VK45DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
9.
Check 1st trip DTC.
10. The 1st trip is detected, go to
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 (1) harness connector.
4.
Restart engine and let it idle for at least 5 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Select Service $03 with GST. Make sure DTC P0102 is
detected.
7.
Select Service $04 with GST and erase the DTC P0102.
8.
Start engine.
If it is difficult to start engine, the fuel injection system has a mal-
function.
Perform the following procedure is advised.
a.
Crank engine while depressing accelerator pedal.
b.
If engine starts, go to
.
If engine does not start, check exhaust and intake air leak visually.
9.
Keep engine at idle for at least 10 minutes.
10. Check 1st trip DTC.
11. If 1st trip DTC is detected, go to
If 1st trip DTC is not detected, 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 10 min-
utes. 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.
12. Check 1st trip DTC.
13. The 1st trip is detected, go to
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).
PBIB3230E
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).
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-863
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Wiring Diagram
INFOID:0000000001326700
BANK 1
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
CAUTION:
TBWM1332E
EC-864
< SERVICE INFORMATION >
[VK45DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
2
P
A/F sensor 1 heater
(Bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 5V
16
R
A/F sensor 1 (Bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 3.1V
35
G
Approximately 2.6V
56
B
Approximately 2.3V
75
OR
Approximately 2.3V
21
22
23
44
W
R
P
OR
Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
Fuel injector No. 7
[Engine is running]
• Warm-up condition
• Idle speed
NOTE:
The pulse cycle changes depending on rpm
at idle
BATTERY VOLTAGE
(11 - 14V)
[Engine is running]
• Warm-up condition
• Engine speed: 2,000 rpm
BATTERY VOLTAGE
(11 - 14V)
PBIB1584E
PBIB0042E
PBIB0043E
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