Nissan Pathfinder (2007 year). Manual - part 182

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-323

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2007 Pathfinder

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuel pump and circuit (Refer to, 

EC-637, "FUEL PUMP"

 .)

●

Fuel pressure regulator (Refer to 

EC-80, "FUEL PRESSURE CHECK"

 .)

>> Repair or replace.

6. 

CHECK MASS AIR FLOW SENSOR

 With CONSULT-II

1.

Install all removed parts.

2.

Check “MASS AIR FLOW” in “DATA MONITOR” mode with CONSULT-II.

OK or NG

OK

>> GO TO 8.

NG

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

ground. Refer to 

EC-187

 .

7. 

CHECK MASS AIR FLOW SENSOR

 With GST

1.

Install all removed parts.

2.

Check mass air flow sensor signal in Service $01 with GST.

OK or NG

OK (P0172)>>GO TO 9.
OK (P0175)>>GO TO 11.
NG

>> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or

ground. Refer to 

EC-187

 .

8. 

CHECK FUNCTION OF FUEL INJECTOR

 With CONSULT-II

1.

Start engine.

2.

Perform “POWER BALANCE” in “ACTIVE TEST” mode with
CONSULT-II.

3.

Make sure that each circuit produces a momentary engine
speed drop.

OK or NG

OK

>> GO TO 12.

NG

>> Perform trouble diagnosis for FUEL INJECTOR, refer to 

EC-630

 .

2.0 - 6.0 g·m/sec:

at idling

7.0 - 20.0 g·m/sec:

at 2,500 rpm

2.0 - 6.0 g·m/sec:

at idling

7.0 - 20.0 g·m/sec:

at 2,500 rpm

PBIB0133E

EC-324

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

2007 Pathfinder

9. 

CHECK FUNCTION OF FUEL INJECTOR-I

 Without CONSULT-II

1.

Stop engine.

2.

Disconnect harness connector F44, F101

3.

Turn ignition switch ON.

4.

Check voltage between harness connector F44 terminal 3 and
ground with CONSULT-II or tester.

5.

Turn ignition switch OFF.

6.

Disconnect ECM harness connector.

7.

Check harness continuity between harness connector F44 and
ECM as follows.
Refer to Wiring Diagram.

8.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 10.

NG

>> Perform trouble diagnosis for FUEL INJECTOR, refer to 

EC-630

 .

10. 

CHECK FUNCTION OF FUEL INJECTOR-II

Provide battery voltage between harness connector F101 as follows
and then interrupt it. Listen to each fuel injector operating sound.

OK or NG

OK

>> GO TO 12.

NG

>> Perform trouble diagnosis for FUEL INJECTOR, refer to 

EC-630

 .

BBIA0587E

Voltage: Battery voltage

Cylinder

Harness connector F44 

terminal

ECM terminal

1

2

23

3

1

22

5

4

21

Continuity should exist.

PBIB2633E

Cylinder

Harness connector F101 terminal

(+)

(–)

1

3

2

3

3

1

5

3

4

Operating sound should exist.

PBIB2634E

DTC P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

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11. 

CHECK FUNCTION OF FUEL INJECTOR

1.

Start engine.

2.

Listen to fuel injectors No.2, No.4, No.6 operating sound.

OK or NG

OK

>> GO TO 12.

NG

>> Perform trouble diagnosis for FUEL INJECTOR, refer to

EC-630

 .

12. 

CHECK FUEL INJECTOR

1.

Remove fuel injector assembly. Refer to 

EM-35, "FUEL INJECTOR AND FUEL TUBE"

 .

Keep fuel hose and all fuel injectors connected to fuel tube.

2.

Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

3.

Disconnect all fuel injector harness connectors.

4.

Disconnect all ignition coil harness connectors.

5.

Prepare pans or saucers under each fuel injectors.

6.

Crank engine for about 3 seconds.
Make sure fuel does not drip from fuel injector.

OK or NG

OK (Does not drip.)>>GO TO 13.
NG (Drips.)>>Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.

13. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Clicking noise should exist.

PBIB1986E

EC-326

DTC P0181 FTT SENSOR

2007 Pathfinder

DTC P0181 FTT SENSOR

PFP:22630

Component Description

UBS00K7I

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.

<Reference data>

*: 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 Logic

UBS00K7J

DTC Confirmation Procedure

UBS00K7K

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-329, "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-329, "Diagnostic Procedure"

  .

BBIA0545E

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/
performance

Rationally 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

DTC P0181 FTT SENSOR

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2007 Pathfinder

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

EC-328

DTC P0181 FTT SENSOR

2007 Pathfinder

Wiring Diagram

UBS00K7L

BBWA1987E

DTC P0181 FTT SENSOR

EC-329

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Diagnostic Procedure

UBS00K7M

1. 

CHECK COMBINATION METER FUNCTION

Refer to 

DI-4, "COMBINATION METERS"

  .

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

DI-20, "Fuel Level Sensor Unit Inspection"

  .

2. 

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-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E41, C1

●

Harness for open or short between ECM and “fuel level sensor unit and fuel pump”

>> Repair harness or connector.

4. 

CHECK FUEL TANK TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect combination meter harness connector.

3.

Check harness continuity between “fuel level sensor unit and fuel pump” terminal 2 and combination
meter terminal 9. Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

BBIA0545E

Voltage: Approximately 5V

PBIB0932E

Continuity should exist.

EC-330

DTC P0181 FTT SENSOR

2007 Pathfinder

5. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E41, C1

●

Harness connectors E152, M31

●

Harness for open or short between “fuel level sensor unit and fuel pump” and combination meter

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

6. 

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-330, "Component Inspection"

  .

OK or NG

OK

>> GO TO 7.

NG

>> Replace fuel level sensor unit.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

  .

>> INSPECTION END

Component Inspection

UBS00K7N

FUEL TANK TEMPERATURE SENSOR

1.

Remove fuel level sensor unit.

2.

Check resistance between “fuel level sensor unit and fuel pump”
terminals 2 and 4 by heating with hot water or heat gun as
shown in the figure.

Removal and Installation

UBS00K7O

FUEL TANK TEMPERATURE SENSOR

Refer to 

FL-6, "FUEL LEVEL SENSOR UNIT, FUEL FILTER AND FUEL PUMP ASSEMBLY"

  .

Temperature 

°

C (

°

F)

Resistance k

Ω

20 (68)

2.3 - 2.7

50 (122)

0.79 - 0.90

PBIB2663E