2008 INFINITI FX35 Service Manual

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Page 1529 of 3924

INFINITI FX35 2008 Service Manual
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-289
< SERVICE INFORMATION > [VQ35DE]
C
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EC
NP
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by osc

Page 1530 of 3924

INFINITI FX35 2008 Service Manual
EC-290
< SERVICE INFORMATION >[VQ35DE]
DTC P0172, P0175 FUEL IN
JECTION SYSTEM FUNCTION
Listen for an intake air leak after the mass air flow sensor.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace.

Page 1531 of 3924

INFINITI FX35 2008 Service Manual
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-291
< SERVICE INFORMATION > [VQ35DE]
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OK or NG
OK >> GO TO 6.
NG >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the f

Page 1532 of 3924

INFINITI FX35 2008 Service Manual
EC-292
< SERVICE INFORMATION >[VQ35DE]
DTC P0172, P0175 FUEL IN
JECTION SYSTEM FUNCTION
4. Check voltage between harness connector F50 terminal 5 and
ground.
5. Turn ignition switch OFF.
6. Disconnec

Page 1533 of 3924

INFINITI FX35 2008 Service Manual
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-293
< SERVICE INFORMATION > [VQ35DE]
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OK or NG
OK (Does not drip.)>>GO TO 11.
NG (Drips.)>>Replace the fuel injectors

Page 1534 of 3924

INFINITI FX35 2008 Service Manual
EC-294
< SERVICE INFORMATION >[VQ35DE]
DTC P0181 FTT SENSOR
DTC P0181 FTT SENSOR
Component DescriptionINFOID:0000000001326109
The fuel tank temperature (FTT)
sensor is used to detect the fuel
temper

EC-294
< SERVICE INFORMATION >[VQ35DE]
DTC P0181 FTT SENSOR
DTC P0181 FTT SENSOR
Component DescriptionINFOID:0000000001326109
The fuel tank temperature (FTT)
sensor is used to detect the fuel
temperature inside the fuel tank. The sensor modifies a voltage sig-
nal from the ECM. The modified signal returns to the ECM as the
fuel temperature input. The sensor uses a thermistor which is sensi-
tive to the change in temperature. The electrical resistance of the
thermistor decreases as temperature increases.

*: This data is reference values and is 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 LogicINFOID:0000000001326110
DTC Confirmation ProcedureINFOID:0000000001326111
NOTE:
If DTC Confirmation Procedure has been previously conduc ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
WITH CONSULT-III
1. Turn ignition switch ON and wait at least 10 seconds.
2. Wait at least 10 seconds. If 1st trip DTC is detected, go to EC-296, "
Diagnosis Procedure".
If 1st trip DTC is not det ected, go to following step.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Check “COOLAN TEMP/S” value. If “COOLAN TEMP/S” is less than 60 °C (140 °F), the result will be OK.
If “COOLAN TEMP/S” is above 60 °C (140 °F), 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. Check 1st trip DTC.
PBIB1572E
Fluid temperature °C ( °F) Voltage*
V Resistance
kΩ
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
0181 Fuel tank temperature
sensor circuit range/per-
formance Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signals
from engine coolant temperature sensor and in-
take air temperature sensor. Harness or connectors
(Fuel tank temperature sensor circuit is
open or shorted)
Fuel tank temperature sensor
Unified meter and A/C amp.
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 1535 of 3924

INFINITI FX35 2008 Service Manual
DTC P0181 FTT SENSOREC-295
< SERVICE INFORMATION > [VQ35DE]
C
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EC
NP
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8. If 1st trip DTC is detected, go to
EC-296, "Diagnosis Procedure".
WITH GST
Follow the procedure “WIT

Page 1536 of 3924

INFINITI FX35 2008 Service Manual
EC-296
< SERVICE INFORMATION >[VQ35DE]
DTC P0181 FTT SENSOR
Diagnosis Procedure
INFOID:0000000001326113
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten ground screw on

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