Infiniti QX56 (JA60). Manual - part 672

LAN

CAN COMMUNICATION CIRCUIT

LAN-87

< COMPONENT DIAGNOSIS >

[CAN]

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

CAN COMMUNICATION CIRCUIT

Diagnosis Procedure

INFOID:0000000005146494

1.

CONNECTOR INSPECTION

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Disconnect all the unit connectors on CAN communication system.

4. Check terminals and connectors for damage, bend and loose connection.
Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair the terminal and connector.

2.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector terminals.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Check the harness and repair the root cause.

3.

CHECK HARNESS CONTINUITY (SHORT CIRCUIT)

Check the continuity between the data link connector and the ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Check the harness and repair the root cause.

4.

CHECK ECM AND IPDM E/R TERMINATION CIRCUIT

1. Remove the ECM and the IPDM E/R.

2. Check the resistance between the ECM terminals.

3. Check the resistance between the IPDM E/R terminals.

Is the measurement value within the specification?

YES

>> GO TO 5.

NO

>> Replace the ECM and/or the IPDM E/R.

5.

CHECK SYMPTOM

Connect all the connectors. Check if the symptoms described in the “Symptom (Results from interview with

customer)” are reproduced. 

Data link connector

Continuity

Connector No.

Terminal No.

M22

6

14

Not existed

Data link connector

Ground

Continuity

Connector No.

Terminal No.

M22

6

Not existed

14

Not existed

ECM

Resistance (

Ω)

Terminal No.

94

86

Approx. 108 – 132

IPDM E/R

Resistance (

Ω)

Terminal No.

39

40

Approx. 108 – 132

LKIA0037E

LAN-88

< COMPONENT DIAGNOSIS >

[CAN]

CAN COMMUNICATION CIRCUIT

Inspection result

Reproduced>>GO TO 6.

Non-reproduced>>Start the diagnosis again. Follow the trouble diagnosis procedure when past error is

detected.

6.

CHECK UNIT REPRODUCTION

Perform the reproduction test as per the following procedure for each unit.

1. Turn the ignition switch OFF.

2. Disconnect the battery cable from the negative terminal.

3. Disconnect one of the unit connectors of CAN communication system.

NOTE:

ECM and IPDM E/R have a termination circuit. Check other units first.

4. Connect the battery cable to the negative terminal. Check if the symptoms described in the “Symptom

(Results from interview with customer)” are reproduced. 

NOTE:

Although unit-related error symptoms occur, do not confuse them with other symptoms. 

Inspection result

Reproduced>>Connect the connector. Check other units as per the above procedure.

Non-reproduced>>Replace the unit whose connector was disconnected.

LU-1

ENGINE

C

D

E

F

G

H

I

J

K

L

M

SECTION 

LU

A

LU

N

O

P

CONTENTS

ENGINE LUBRICATION SYSTEM

PRECAUTION ...............................................

2

PRECAUTIONS ...................................................

2

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................

2

Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .....................................

2

Precaution for Liquid Gasket .....................................

3

PREPARATION ............................................

4

PREPARATION ...................................................

4

Special Service Tool  .................................................

4

Commercial Service Tool  ..........................................

4

FUNCTION DIAGNOSIS ...............................

6

LUBRICATION SYSTEM  ....................................

6

Lubrication Circuit  .....................................................

6

Schematic .................................................................

7

ON-VEHICLE MAINTENANCE .....................

8

ENGINE OIL  ........................................................

8

Inspection ..................................................................

8

Changing Engine Oil .................................................

9

OIL FILTER  .......................................................

11

Removal and Installation  .........................................

11

ON-VEHICLE REPAIR .................................

12

OIL COOLER  ....................................................

12

Exploded View .........................................................

12

Removal and Installation  .........................................

12

OIL PUMP  .........................................................

14

Exploded View .........................................................

14

Removal and Installation  .........................................

14

DISASSEMBLY AND ASSEMBLY ..............

16

OIL PUMP  .........................................................

16

Disassembly and Assembly .....................................

16

SERVICE DATA AND SPECIFICATIONS 
(SDS) ............................................................

18

SERVICE DATA AND SPECIFICATIONS 
(SDS) .................................................................

18

Standard and Limit  ..................................................

18

LU-2

< PRECAUTION >

PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000005260134

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SR and SB section of this Service Man-

ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000005260135

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″LOCK″ position.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the 

″ACC″ position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.