Infiniti QX56 (Z62). Manual - part 635

 

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Infiniti QX56 (Z62). Manual - part 635

 

 

EC-518

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace fuel filler tube.

15.

CHECK ONE-WAY FUEL VALVE-I

Check one-way fuel valve for clogging.
Is the inspection result normal?

YES

>> GO TO 16.

NO

>> Repair or replace one-way fuel valve with fuel tank.

16.

CHECK ONE-WAY FUEL VALVE-II

1.

Check that fuel is drained from the tank.

2.

Remove fuel filler tube and hose.

3.

Check one-way fuel valve for operation as per the following.
When a stick is inserted, the valve should open, when removing
stick it should close.
Do not drop any material into the tank.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace fuel filler tube or replace one-way fuel valve

with fuel tank.

Component Inspection (EVAP Vapor Cut Valve)

INFOID:0000000006256492

1.

CHECK REFUELING EVAP VAPOR CUT VALVE

1.

Turn ignition switch OFF.

2.

Remove fuel tank. Refer to 

FL-8, "Removal and Installation"

.

3.

Drain fuel from the tank as per the following:

-

Remove fuel gauge retainer.

-

Drain fuel from the tank using a handy pump into a fuel container.

4.

Check refueling EVAP vapor cut valve for being stuck to close as per the following.
Blow air into the refueling EVAP vapor cut valve (from the end of EVAP/ORVR line hose), and check that
the air flows freely into the tank.

5.

Check refueling EVAP vapor cut valve for being stuck to open as per the following.

-

Connect vacuum pump to hose end.

-

Remove fuel gauge retainer with fuel gauge unit.

Always replace O-ring with new one.

-

Turn fuel tank upside down.

SEF665U

ON BOARD REFUELING VAPOR RECOVERY (ORVR)

EC-519

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

-

Apply vacuum pressure to hose end [

13.3 kPa (

0.136 kg/cm

3

1.93 psi)] with fuel gauge retainer

remaining open and check that the pressure is applicable.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace refueling EVAP vapor cut valve with fuel tank.

JSBIA0605GB

EC-520

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

REFRIGERANT PRESSURE SENSOR

REFRIGERANT PRESSURE SENSOR

Component Function Check

INFOID:0000000006218026

1.

CHECK REFRIGERANT PRESSURE SENSOR FUNCTION

1.

Start engine and warm it up to normal operating temperature.

2.

Turn A/C switch and blower fan switch ON.

3.

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-520, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006218027

1.

CHECK REFRIGERANT PRESSURE SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect refrigerant pressure sensor harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between refrigerant pressure sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

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

3.

CHECK REFRIGERANT PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between refrigerant pressure sensor harness connector and ECM harness connec-
tor.

4.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

ECM

Voltage (V)

Connector

+

Terminal

Terminal

E80

144

(Refrigerant pressure sensor signal)

150

1.0 - 4.0

Refrigerant pressure sensor

Ground

Voltage (V)

Connector

Terminal

E77

1

Ground

Approx. 5

Refrigerant pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E77

3

E80

150

Existed

REFRIGERANT PRESSURE SENSOR

EC-521

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

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

5.

CHECK REFRIGERANT PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between refrigerant pressure sensor harness connector and ECM harness connec-
tor.

2.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness for open or short between ECM and refrigerant pressure sensor
• Loose or poor connection for each connector and harness

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

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace refrigerant pressure sensor. Refer to 

HA-39, "REFRIGERANT PRESSURE SENSOR :

Removal and Installation"

.

NO

>> Repair or replace malfunctioning part. 

Refrigerant pressure sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E77

2

E80

144

Existed

 

 

 

 

 

 

 

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