Infiniti Q45. Manual - part 379

POWER SUPPLY AND GROUND CIRCUIT

EC-155

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F

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EC

For detailed ground distribution information, refer to 

PG-15, "Ground Distribution"

 .

Component Inspection

NBS001RL

ECM RELAY

1.

Apply 12V direct current between ECM relay terminals 1 and 2.

2.

Check continuity between relay terminals 3 and 5, 6 and 7.

3.

If NG, replace ECM relay.

PBIB1870E

Condition

Continuity

12V direct current supply between
terminals 1 and 2

Yes

OFF

No

PBIB0077E

EC-156

DTC U1000, U1001 CAN COMMUNICATION LINE

DTC U1000, U1001 CAN COMMUNICATION LINE

PFP:23710

Description

NBS001RM

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CAN communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

NBS001RN

*1: This self-diagnosis has the one trip detection logic.
*2: The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

NBS001RO

1.

Turn ignition switch ON and wait at least 3 seconds.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

If 1st trip DTC is detected, go to 

EC-158, "Diagnostic Procedure"

 .

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U1000*

1

1000*

1

CAN communication line

●

ECM cannot communicate to other control units.

●

ECM cannot communicate for more than the 
specified time.

●

Harness or connectors
(CAN communication line is open or 
shorted)

U1001*

2

1001*

2

DTC U1000, U1001 CAN COMMUNICATION LINE

EC-157

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Wiring Diagram

NBS001RP

TBWT0698E

EC-158

DTC U1000, U1001 CAN COMMUNICATION LINE

Diagnostic Procedure

NBS001RQ

Go to 

LAN-17, "Precautions When Using CONSULT-II"

 .