Infiniti QX56 (Z62). Manual - part 114

BCS-70

< DTC/CIRCUIT DIAGNOSIS >

U1000 CAN COMM

DTC/CIRCUIT DIAGNOSIS

U1000 CAN COMM

Description

INFOID:0000000006274829

CAN (Controller Area Network) is a serial communication line for real time applications. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent error detection ability. Modern
vehicle is equipped with many electronic control unit, 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.
CAN Communication Signal Chart. Refer to 

LAN-28, "CAN COMMUNICATION SYSTEM : CAN Communica-

tion Signal Chart"

.

DTC Logic

INFOID:0000000006274830

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006274831

1.

PERFORM SELF DIAGNOSTIC

1.

Turn ignition switch ON and wait for 2 seconds or more.

2.

Check “Self Diagnostic Result” of BCM.

Is DTC “U1000” displayed?

YES

>> Refer to 

LAN-18, "Trouble Diagnosis Flow Chart"

.

NO

>> Refer to 

GI-40, "Intermittent Incident"

.

DTC

CONSULT-III display 

description

DTC Detection Condition

Possible cause

U1000

CAN COMM

When BCM cannot communicate CAN com-
munication signal continuously for 2 seconds 
or more.

CAN communication system

BCS

U1010 CONTROL UNIT (CAN)

BCS-71

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

U1010 CONTROL UNIT (CAN)

DTC Logic

INFOID:0000000006274832

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000006274833

1.

REPLACE BCM

When DTC “U1010” is detected, replace BCM.

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

DTC

CONSULT-III display de-

scription

DTC Detection Condition

Possible cause

U1010

CONTROL UNIT (CAN)

BCM detected internal CAN communication circuit malfunction.

BCM

BCS-72

< DTC/CIRCUIT DIAGNOSIS >

U0415 VEHICLE SPEED

U0415 VEHICLE SPEED

Description

INFOID:0000000006274834

U0415 is displayed if any unusual condition is present in the reception status of the vehicle speed signal from
the ABS actuator and electric unit (control unit).

DTC Logic

INFOID:0000000006274835

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION

1.

Erase the DTC.

2.

Turn ignition switch OFF.

3.

Perform the “Self Diagnostic Result” of BCM with CONSULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.

Is any DTC detected?

YES

>> Refer to 

BCS-72, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006274836

1.

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAG RESULTS 

Perform “Self-Diagnostic Result” of ABS actuator and electric unit (control unit) with CONSULT-III. Refer to

BRC-40, "CONSULT-III Function"

.

Is any DTC detected?

YES

>> Repair or replace the malfunctioning part.

NO

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

DTC

 CONSULT-III display 

description

DTC Detection Condition

Probable cause

U0415

VEHICLE SPEED

When the vehicle speed signal received from 
the ABS actuator and electric unit (control 
unit) remains abnormal for 2 seconds or more.

• ABS actuator and electric unit (control unit)
• BCM

BCS

B2562 LOW VOLTAGE

BCS-73

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

H

I

J

K

L

B

A

O

P

N

B2562 LOW VOLTAGE

DTC Logic

INFOID:0000000006274837

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC CONFIRMATION

1.

Erase DTC.

2.

Turn ignition switch OFF.

3.

Perform the “Self Diagnostic Result” of BCM with CONSULT-III, when passed 120 seconds or more after
the ignition switch is turned ON.

Is any DTC detected?

YES

>> Refer to 

BCS-73, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000006274838

1.

CHECK POWER SUPPLY CIRCUIT

Check BCM power supply circuit. Refer to 

BCS-75, "Diagnosis Procedure"

.

Is the circuit normal?

YES

>> Replace BCM. Refer to 

BCS-81, "Removal and Installation"

.

NO

>> Repair the malfunctioning part.

DTC

CONSULT-III display 

description

DTC Detection Condition

Possible cause

B2562

LOW VOLTAGE

When the power supply voltage to BCM remains less 
than 8.8 V for 120 seconds or more

Harness or connector (power supply 
circuit)