Infiniti FX35 / FX45. Manual — part 379
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-277
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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
R/L
A/F sensor 1 heater
(bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 5V
16
G
A/F sensor 1 (bank 1)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 3.1V
35
B/R
Approximately 2.6V
56
L
Approximately 2.3V
75
R/B
Approximately 2.3V
21
22
23
W
G
R
Fuel injector No. 5
Fuel injector No. 3
Fuel injector No. 1
[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
SEC984C
SEC985C
EC-278
< SERVICE INFORMATION >
[VQ35DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
BANK 2
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.
CAUTION:
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.
TBWM1595E
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-279
< SERVICE INFORMATION >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Procedure
INFOID:0000000001326104
1.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before three way catalyst 1.
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK FOR INTAKE AIR LEAK
TER-
MI-
NAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
24
L
A/F sensor 1 heater
(bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 5V
40
41
42
LG
B
P
Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
[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)
57
G
A/F sensor 1 (bank 2)
[Engine is running]
• Warm-up condition
• Idle speed
Approximately 2.6V
58
Y
Approximately 2.3V
76
P
Approximately 3.1V
77
BR
Approximately 2.3V
PBIB1584E
SEC984C
SEC985C
PBIB1922E
EC-280
< SERVICE INFORMATION >
[VQ35DE]
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
1.
Listen for an intake air leak after the mass air flow sensor.
2.
Check PCV hose connection.
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace.
3.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect corresponding air fuel ration (A/F) sensor 1 harness connector.
3.
Disconnect ECM harness connector.
4.
Check harness continuity between the following terminals.
Refer to Wiring Diagram.
5.
Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.
6.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK FUEL PRESSURE
1.
Release fuel pressure to zero. Refer to
.
2.
Install fuel pressure gauge and check fuel pressure. Refer to
A/F sensor 1 terminal
ECM terminal
Bank 1
1
16
2
75
5
35
6
56
Bank 2
1
76
2
77
5
57
6
58
Continuity should exist.
Bank 1
Bank 2
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
ECM terminal
1
16
1
76
2
75
2
77
5
35
5
57
6
56
6
58
Continuity should not exist.
PBIB2190E
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