Infiniti FX35 / FX45. Manual - part 383

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-293

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

OK or NG

OK (Does not drip.)>>GO TO 11.
NG (Drips.)>>Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.

11.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-139

.

>> INSPECTION END

EC-294

< SERVICE INFORMATION >

[VQ35DE]

DTC P0181 FTT SENSOR

DTC P0181 FTT SENSOR

Component Description

INFOID: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.

<Reference data>

*: 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 Logic

INFOID:0000000001326110

DTC Confirmation Procedure

INFOID:0000000001326111

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-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 detected, 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

k

Ω

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.

DTC P0181 FTT SENSOR

EC-295

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

8.

If 1st trip DTC is detected, go to 

EC-296, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-III” above.

Wiring Diagram

INFOID:0000000001326112

TBWM1386E

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 the body. Refer to 

EC-144, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK DTC WITH “UNIFIED METER AND A/C AMP.”

Refer to 

DI-27, "CONSULT-III Function (METER/M&A)"

.

OK or NG

OK

>> GO TO 3.

NG

>> Go to 

DI-19, "Fuel Level Sensor Signal Inspection"

.

3.

CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect “fuel level sensor unit and fuel pump” harness con-
nector.

3.

Turn ignition switch ON.

4.

Check voltage between “fuel level sensor unit and fuel pump”
terminal 4 and ground with CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors B1, M11
• Harness for open or short between ECM and “fuel level sensor unit and fuel pump”

>> Repair open circuit or short to ground or short to power in harness or connector.

PBIB2625E

PBIB1572E

Voltage: Approximately 5V

PBIB0932E