Nissan Pathfinder (2009 year). Manual - part 272

EC-190

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

• Fuel pump and circuit (Refer to, 

EC-398, "Diagnosis Procedure"

.)

• Fuel pressure regulator (Refer to 

EC-484, "Fuel Pressure Check"

.)

>> Repair or replace.

6.

CHECK MASS AIR FLOW SENSOR

 With CONSULT-III

1.

Install all removed parts.

2.

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

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-111, "Component Description"

.

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-111, "Component Description"

.

8.

CHECK FUNCTION OF FUEL INJECTOR

 With CONSULT-III

1.

Start engine.

2.

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

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-394, "Component Description"

.

9.

CHECK FUNCTION OF FUEL INJECTOR-I

 Without CONSULT-III

1.

Stop engine.

2.

Disconnect harness connector F44 (3), F201 (1)

3.

Turn ignition switch ON.

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

2

: Vacuum tank

: Front

AWBIA0686ZZ

2009 Pathfinder

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

EC-191

< COMPONENT DIAGNOSIS >

[VQ40DE]

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4.

Check voltage between harness connector F44 terminal 3 and
ground with CONSULT-III 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-394, "Component Description"

.

10.

CHECK FUNCTION OF FUEL INJECTOR-II

Provide battery voltage between harness connector F201 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-394, "Component Description"

.

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-394, "Component Description"

.

12.

CHECK FUEL INJECTOR

1.

Remove fuel injector assembly. Refer to 

EM-45, "Removal and Installation"

.

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.

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 F201 terminal

(+)

(–)

1

3

2

3

3

1

5

3

4

Operating sound should exist.

PBIB2634E

Clicking noise should exist.

PBIB1986E

2009 Pathfinder

EC-192

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0172, P0175 FUEL INJECTION SYSTEM FUNCTION

3.

Disconnect all fuel injector harness connectors.

4.

Disconnect all ignition coil harness connectors.

5.

Prepare pans or saucers under each fuel injector.

6.

Crank engine for about 3 seconds.
Make that 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 

GI-49, "Intermittent Incident"

.

>> INSPECTION END

2009 Pathfinder

P0181 FTT SENSOR

EC-193

< COMPONENT DIAGNOSIS >

[VQ40DE]

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P0181 FTT SENSOR

Component Description

INFOID:0000000004297377

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:

Never 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:0000000004297378

DTC Confirmation Procedure

INFOID:0000000004297379

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

 WITH CONSULT-III

1.

Turn ignition switch ON and wait at least 10 seconds.

2.

Check 1st trip DTC.
If 1st trip DTC is detected, go to 

EC-194, "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).

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/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

(The sensor circuit is open or shorted)

• Fuel tank temperature sensor

2009 Pathfinder

EC-194

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0181 FTT SENSOR

6.

Wait at least 10 seconds.

7.

Check 1st trip DTC.

8.

If 1st trip DTC is detected, go to 

EC-194, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000004297380

1.

CHECK COMBINATION METER FUNCTION

Refer to 

GI-45, "Work Flow"

.

OK or NG

OK

>> GO TO 2.

NG

>> Go to 

MWI-32, "Component Function Check"

.

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-III 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.

Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground. Refer to
Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

BBIA0545E

Voltage: Approximately 5V

PBIB0932E

Continuity should exist.

2009 Pathfinder

P0181 FTT SENSOR

EC-195

< COMPONENT DIAGNOSIS >

[VQ40DE]

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EC

N

P

O

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E41, C1
• Harness for open or short between “fuel level sensor unit and fuel pump”  ground

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

6.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-195, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

NG

>> Replace fuel level sensor unit.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-49, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000004297381

FUEL TANK TEMPERATURE SENSOR

1.

Remove fuel level sensor unit.

2.

Check resistance between “fuel level sensor unit and fuel pump”
terminals 3 and 4 by heating with hot water or heat gun as
shown in the figure.

Temperature 

°

C (

°

F)

Resistance k

Ω

20 (68)

2.3 - 2.7

50 (122)

0.79 - 0.90

SEF476YA

2009 Pathfinder

EC-196

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0182, P0183 FTT SENSOR

P0182, P0183 FTT SENSOR

Component Description

INFOID:0000000004297382

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:

Never 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:0000000004297383

DTC Confirmation Procedure

INFOID:0000000004297384

1.

If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.

a.

Turn ignition switch OFF and wait at least 10 seconds.

b.

Turn ignition switch ON.

c.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON and wait at least 5 seconds.

3.

Check 1st trip DTC.

4.

If 1st trip DTC is detected, go to 

EC-196, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000004297385

1.

CHECK COMBINATION METER FUNCTION

Refer to 

GI-45, "Work Flow"

.

OK or NG

OK

>> GO TO 2.

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

P0182
0182

Fuel tank temperature 
sensor circuit low input

An excessively low voltage from the sensor is 
sent to ECM.

• Harness or connectors

(The sensor circuit is open or shorted.)

• Fuel tank temperature sensor

P0183
0183

Fuel tank temperature 
sensor circuit high input

An excessively high voltage from the sensor is 
sent to ECM.

2009 Pathfinder

P0182, P0183 FTT SENSOR

EC-197

< COMPONENT DIAGNOSIS >

[VQ40DE]

C

D

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F

G

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K

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EC

N

P

O

NG

>> Go to 

MWI-32, "Component Function Check"

.

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-III 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.

Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground. Refer to
Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 6.

NG

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E41, C1
• Harness for open or short between “fuel level sensor unit and fuel pump” and ground

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

6.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-198, "Component Inspection"

.

OK or NG

OK

>> GO TO 7.

BBIA0545E

Voltage: Approximately 5V

PBIB0932E

Continuity should exist.

2009 Pathfinder