Infiniti QX56 (Z62). Manual - part 574

EC-274

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0182, P0183 FTT SENSOR

P0182, P0183 FTT SENSOR

DTC Logic

INFOID:0000000006288292

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON and wait at least 5 seconds.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-274, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288293

1.

CHECK DTC WITH COMBINATION METER

Refer to 

MWI-30, "CONSULT-III Function"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Proceed to 

MWI-69, "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 connector.

3.

Turn ignition switch ON.

4.

Check the voltage between “fuel level sensor unit and fuel pump” harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

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

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0182

FTT SEN/CIRCUIT
(Fuel tank temperature sen-
sor circuit low input)

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

• Harness or connectors

(The FTT sensor circuit is open or 
shorted.)

• Fuel tank temperature sensor
• Combination meter

P0183

FTT SEN/CIRCUIT
(Fuel tank temperature sen-
sor circuit high input)

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

Fuel level sensor unit and 

fuel pump

Ground

Voltage (V)

Connector

Terminal

C5

4

Ground

Approx. 5

P0182, P0183 FTT SENSOR

EC-275

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

• Loose or poor connection for each connector and harness

>> Repair open circuit, short to ground or short to power in 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 the continuity between “fuel level sensor unit and fuel pump” harness connector and “combination
meter” harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between “fuel level sensor unit and fuel pump” and “combination meter”
• Loose or poor connection for each connector and harness

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

6.

CHECK FUEL TANK TEMPERATURE SENSOR

Refer to 

EC-275, "Component Inspection (Fuel Tank Temperature Sensor)"

.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Replace “fuel level sensor unit and fuel pump”. Refer to 

FL-5, "Removal and Installation"

.

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection (Fuel Tank Temperature Sensor)

INFOID:0000000006288294

1.

CHECK FUEL TANK TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect “fuel level sensor unit and fuel pump” harness connector.

3.

Remove fuel level sensor unit.

4.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace “fuel level sensor unit and fuel pump”.

Fuel level sensor unit and 

fuel pump

Combination meter

Continuity

Connector

Terminal

Connector

Terminal

C5

5

M34

24

Existed

Terminals

Condition

Resistance (k

Ω

)

4 and 5

Temperature [

°

C (

°

F)]

20 (68)

2.3 - 2.7

50 (122)

0.79 - 0.90

JMBIA0167ZZ

EC-276

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0190, P0192, P0193 FRP SENSOR

P0190, P0192, P0193 FRP SENSOR

DTC Logic

INFOID:0000000006288295

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

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.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start the engine ON and wait at least 60 seconds.

2.

Check DTC or 1st trip DTC.

Is DTC or 1st trip DTC detected?

YES

>> Proceed to 

EC-276, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006288296

1.

CHECK FRP SENSOR POWER SUPPLY-I

1.

Turn ignition switch OFF.

2.

Disconnect FRP sensor connector.

3.

Turn ignition switch ON.

4.

Check the voltage between FRP sensor harness connector terminals.

Inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 2.

2.

CHECK FRP SENSOR POWER SUPPLY-II

Check the voltage between FRP sensor harness connector and the ground.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0190

Fuel rail pressure sensor 
circuit low input and high in-
put

Signal voltage from the fuel rail pressure 
sensor remains at more than 4.84 V / 
less than 0.2 V for 5 seconds or more.

• Harness or connectors

(Fuel rail pressure sensor circuit is open or 
shorted.)
(Power steering pressure sensor circuit is 
open or shorted.)
(Low fuel pressure sensor circuit is open or 
shorted.)
(The electrically-controlled cooling fan cou-
pling circuit is open or shorted)

• Fuel rail pressure sensor
• Power steering pressure sensor
• Low fuel pressure sensor
• Electrically-controlled cooling fan coupling

P0192

Fuel rail pressure sensor 
circuit low input

Signal voltage from the fuel rail pressure 
sensor remains at less than 0.37 V for 5 
seconds or more.

P0193

Fuel rail pressure sensor 
circuit high input

Signal voltage from the fuel rail pressure 
sensor remains at more than 3.46 V for 5 
seconds or more.

FRP sensor

Voltage

(Approx.)

Connector

+

−

terminal

F26

1

3

5 V

P0190, P0192, P0193 FRP SENSOR

EC-277

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness connector for short to power and short to ground, between the following terminals.

Is inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

EC-168, "Diagnosis Procedure"

.

NO

>> Repair or replace error-detected parts.

4.

CHECK FRP SENSOR GROUND CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between FRP sensor harness connector and ECM harness connector.

Is inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK ECM GROUND CIRCUIT

Check the continuity between ECM harness connector and the ground.

Is inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-40, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

+

−

Voltage

(Approx.)

FRP sensor

Connector

Terminal

F26

1

Ground

5 V

ECM

Sensor

Connector

Terminal

Name

Connector

Terminal

F111

27

Low fuel pressure sensor

F25

3

Power steering pressure sensor

F35

1

Cooling fan speed sensor

F39

2

28

FRP sensor

F26

1

+

−

Continuity

FRP sensor

ECM

Connector

Terminal

Connector

Terminal

F26

3

F111

40

Existed

ECM

Ground

Continuity

Connector

Terminal

F111

5

Ground

Existed

E80

114

115

174

175