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-
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
.
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
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000006274838
1.
CHECK POWER SUPPLY CIRCUIT
Check BCM power supply circuit. Refer to
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)
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