Nissan Titan. Manual — part 34
U1000 CAN COMM CIRCUIT
BRC-77
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C
D
E
G
H
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K
L
M
A
B
BRC
N
O
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U1000 CAN COMM CIRCUIT
Description
INFOID:0000000009883702
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.
DTC Logic
INFOID:0000000009883703
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000009883704
1.
CONNECTOR INSPECTION
1. Turn ignition switch OFF.
2. Disconnect the ABS actuator and electric unit (control unit) connector
3. Check the terminals for deformation, disconnection, looseness, and so on. If there is a malfunction, repair
or replace the terminal.
4. Reconnect connector and perform self-diagnosis. Refer to
BRC-24, "CONSULT Function (ABS)"
Is “CAN COMM CIRCUIT” displayed in self-diagnosis display items?
YES
>> Print out the self-diagnostic results, and refer to
LAN-14, "Trouble Diagnosis Flow Chart"
NO
>> Connector terminal is loose, damaged, open, or shorted.
DTC
Display item
Malfunction detected condition
Possible cause
U1000
CAN COMM CIRCUIT
When ABS actuator and electric unit (control unit) is not
transmitting or receiving CAN communication signal for 2
seconds or more.
• CAN communication line
• ABS actuator and electric unit
(control unit)
BRC-78
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
VDC OFF SWITCH
VDC OFF SWITCH
Description
INFOID:0000000009883705
VDC OFF switch can deactivate (turn OFF) the VDC/TCS function by pressing the VDC OFF switch.
Component Function Check
INFOID:0000000009883706
1.
CHECK VDC OFF SWITCH OPERATION
Turn ON/OFF the VDC OFF switch and check that the VDC OFF indicator lamp in the combination meter turns
ON/OFF correctly.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000009883707
Regarding Wiring Diagram information, refer to
1.
CHECK VDC OFF SWITCH
Perform the VDC OFF switch component inspection. Refer to
BRC-79, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Replace VDC OFF switch.
2.
CHECK VDC OFF SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec-
tor.
2. Check continuity between ABS actuator and electric unit (control
unit) connector E125 (A) terminal 38 and VDC OFF switch con-
nector M148 (B) terminal 1.
3. Check continuity between ABS actuator and electric unit (control
unit) connector E125 (A) terminal 38 and ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair or replace harness.
3.
CHECK VDC OFF SWITCH GROUND
Condition
VDC OFF indicator lamp illumination status
VDC OFF switch: ON
ON
VDC OFF switch: OFF
OFF
ABS actuator and electric unit
(control unit)
VDC OFF switch
Continuity
Connector
Terminal
Connector
Terminal
A: E125
38
B: M148
1
Yes
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
A: E125
38
Ground
No
AWFIA0430ZZ
VDC OFF SWITCH
BRC-79
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
C
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BRC
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Check continuity between VDC OFF switch connector M148 terminal
2 and ground.
Is the inspection result normal?
YES
>> GO TO 4
NO
>> Repair or replace harness.
4.
CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to
.
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-116, "Removal and Installa-
.
NO
>> Replace combination meter. Refer to
MWI-93, "Removal and Installation"
Component Inspection
INFOID:0000000009883708
1.
CHECK VDC OFF SWITCH
1. Turn ignition switch OFF.
2. Disconnect VDC OFF switch connector.
3. Check continuity between VDC OFF switch terminals.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Replace VDC OFF switch.
Special Repair Requirement
INFOID:0000000009883709
1.
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to
BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
.
>> GO TO 2
2.
CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
BRC-9, "CALIBRATION OF DECEL G SENSOR : Description"
>> END
VDC OFF switch
—
Continuity
Connector
Terminal
M148
2
Ground
Yes
AWFIA0031ZZ
VDC OFF switch terminals
Condition
Continuity
1
− 2
When VDC OFF switch is pressed.
Yes
When VDC OFF switch is released.
No
AWFIA0446ZZ
BRC-80
< DTC/CIRCUIT DIAGNOSIS >
[VDC/TCS/ABS]
ABS WARNING LAMP
ABS WARNING LAMP
Description
INFOID:0000000009883710
×: ON –: OFF
Component Function Check
INFOID:0000000009883711
1.
CHECK ABS WARNING LAMP OPERATION
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Go to diagnosis procedure. Refer to
Diagnosis Procedure
INFOID:0000000009883712
1.
CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Check items displayed by self-diagnosis.
2.
CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to
.
Is the inspection result normal?
YES
>> Replace ABS actuator and electric unit (control unit). Refer to
BRC-116, "Removal and Installa-
.
NO
>> Replace combination meter. Refer to
MWI-93, "Removal and Installation"
Special Repair Requirement
INFOID:0000000009883713
1.
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to
BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
.
>> GO TO 2
2.
CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
BRC-9, "CALIBRATION OF DECEL G SENSOR : Description"
>> END
Condition
ABS warning lamp
Ignition switch OFF
–
For 2 seconds after turning ON ignition switch
×
2 seconds later after turning ON ignition switch
–
ABS function is malfunctioning.
×
EBD function is malfunctioning.
×
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