Infiniti Q45. Manual — part 420
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-319
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
2
OR
A/F sensor 1 heater
(bank 1)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 5V
16
W
A/F sensor 1 (bank 1)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 3.1V
35
R
Approximately 2.6V
56
R/L
Approximately 2.3V
75
BR
Approximately 2.3V
21
22
23
44
W/B
Y
R/L
BR
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
EC-320
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
BANK 2
TBWM1229E
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
EC-321
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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.
: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
24
SB
A/F sensor 1 heater
(bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 5V
40
41
42
63
BR
G
B/R
L
Fuel injector No. 6
Fuel injector No. 4
Fuel injector No. 2
Fuel injector No. 8
[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/Y
A/F sensor 1 (bank 2)
[Engine is running]
●
Warm-up condition
●
Idle speed
Approximately 2.6V
58
G
Approximately 2.3V
76
L/W
Approximately 3.1V
77
GY
Approximately 2.3V
PBIB1584E
PBIB0042E
PBIB0043E
EC-322
DTC P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
Diagnostic Procedure
NBS001V9
1.
CHECK EXHAUST GAS LEAK
1.
Start engine and run it at idle.
2.
Listen for an exhaust gas leak before three way catalyst (manifold).
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace.
2.
CHECK FOR INTAKE AIR LEAK
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.
PBIB1216E
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