2006 INFINITI M35 Factory Service Manual

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Page 1881 of 5621

INFINITI M35 2006 Factory Service Manual EC-338
[VQ35DE]
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 January2006 M35/M45
Diagnostic ProcedureNBS004XZ
1. CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen

Page 1882 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-339
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Revision: 2006 January2006 M35/M45
3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2.

Page 1883 of 5621

INFINITI M35 2006 Factory Service Manual EC-340
[VQ35DE]
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 January2006 M35/M45
4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-98, "
FUEL PRESSURE RELEASE&

Page 1884 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
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Revision: 2006 January2006 M35/M45
8. CHECK FUNCTION OF FUEL INJECTOR-I
Without CONSULT-II
1. Turn ignition s

Page 1885 of 5621

INFINITI M35 2006 Factory Service Manual EC-342
[VQ35DE]
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
Revision: 2006 January2006 M35/M45
9. CHECK FUNCTION OF FULE INJECTOR-II
Provide battery voltage between the following terminals,

Page 1886 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0181 FTT SENSOR
EC-343
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Revision: 2006 January2006 M35/M45
DTC P0181 FTT SENSORPFP:22630
Component DescriptionNBS004Y0
The fuel tank temperature sensor (3) i

DTC P0181 FTT SENSOR
EC-343
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Revision: 2006 January2006 M35/M45
DTC P0181 FTT SENSORPFP:22630
Component DescriptionNBS004Y0
The fuel tank temperature sensor (3) is used to detect the fuel tem-
perature inside the fuel tank. The sensor modifies a voltage signal
from the ECM. The modified signal returns to the ECM as the fuel
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.
Fuel level sensor unit and fuel pump (1)
Fuel pressure regulator (2)

*: These data are reference values and are measured between ECM terminal 107
(Fuel tank temperature sensor) and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.
On Board Diagnosis LogicNBS004Y1
DTC Confirmation ProcedureNBS004Y2
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. Turn ignition switch ON.
2. Select “DATA MONITOR” mode with CONSULT-II.
3. Wait at least 10 seconds.
If the result is NG, go to EC-346, "
Diagnostic Procedure" .
If the result is OK, go to following step.
4. Check “COOLAN TEMP/S” value.
If “COOLAN TEMP/S” is less than 60
C (140F), the result will
be OK.
If “COOLAN TEMP/S” is above 60
C (140F), go to the following
step.
5. Cool engine down until “COOLAN TEMP/S” is less than 60
C
(140
F).
6. Wait at least 10 seconds.
7. If 1st trip DTC is detected, go to EC-346, "
Diagnostic Procedure" .
PBIB2707E
Fluid temperature
C (F)Voltage*
VResistance
k
20 (68) 3.5 2.3 - 2.7
50 (122) 2.2 0.79 - 0.90
SEF012P
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0181
0181Fuel tank temperature
sensor circuit range/
performanceRationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage sig-
nals from engine coolant temperature sensor
and intake air temperature sensor.
Harness or connectors
(The sensor circuit is open or shorted)
Fuel tank temperature sensor
SEF174Y

Page 1887 of 5621

INFINITI M35 2006 Factory Service Manual EC-344
[VQ35DE]
DTC P0181 FTT SENSOR
Revision: 2006 January2006 M35/M45
WITH GST
Follow the procedure “WITH CONSULT-II” above.

Page 1888 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0181 FTT SENSOR
EC-345
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Revision: 2006 January2006 M35/M45
Wiring DiagramNBS004Y3
TBWT0958E

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