2005 INFINITI QX4 Factory Service Manual

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Page 1441 of 3419

INFINITI QX4 2005 Factory Service Manual EC-250Revision: October 2005
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
2005 QX56
3. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect corresponding A/F sensor 1

Page 1442 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
EC-251
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Revision: October 20052005 QX56
4. CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to EC-93, "
FUEL PRESSUR

Page 1443 of 3419

INFINITI QX4 2005 Factory Service Manual EC-252Revision: October 2005
DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION
2005 QX56
7. CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Perform “POWER BALANCE” in “ACTIVE TEST

Page 1444 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0181 FTT SENSOR
EC-253
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Revision: October 20052005 QX56
DTC P0181 FTT SENSORPFP:22630
Component DescriptionUBS00H34
The fuel tank temperature sensor is used to detect the

DTC P0181 FTT SENSOR
EC-253
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Revision: October 20052005 QX56
DTC P0181 FTT SENSORPFP:22630
Component DescriptionUBS00H34
The fuel tank temperature sensor is used to detect the fuel tempera-
ture inside the fuel tank. The sensor modifies a voltage signal from
the ECM. The modified signal returns to the ECM as the fuel temper-
ature input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

*: This data is reference value 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 LogicUBS00H35
DTC Confirmation ProcedureUBS00H36
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-256, "
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 (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. If 1st trip DTC is detected, go to EC-256, "
Diagnostic Procedure" .
BBIA0583E
Fluid temperature
°C (°F)Voltage*
VResistance
kΩ
20 (68) 3.5 2.3 - 2.7
50 (122) 2.2 0.79 - 0.90
SEF 0 12 P
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
SEF 1 74 Y

Page 1445 of 3419

INFINITI QX4 2005 Factory Service Manual EC-254Revision: October 2005
DTC P0181 FTT SENSOR
2005 QX56
WITH GST
Follow the procedure “WITH CONSULT-II” above.

Page 1446 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0181 FTT SENSOR
EC-255
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Revision: October 20052005 QX56
Wiring DiagramUBS00H37
BBWA1682E

Page 1447 of 3419

INFINITI QX4 2005 Factory Service Manual EC-256Revision: October 2005
DTC P0181 FTT SENSOR
2005 QX56
Diagnostic ProcedureUBS00H38
1. CHECK COMBINATION METER FUNCTION
Refer to DI-5, "
COMBINATION METERS" .
OK or NG
OK >> GO TO 2.
NG >> Go to

Page 1448 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0181 FTT SENSOR
EC-257
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Revision: October 20052005 QX56
4. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors C1, E41
Harness for open or short between

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