Nissan Xterra. Manual — part 134
U1000 CAN COMM CIRCUIT
BRC-193
< DTC/CIRCUIT DIAGNOSIS >
[TYPE 2]
C
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G
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BRC
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U1000 CAN COMM CIRCUIT
Description
INFOID:0000000009482828
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:0000000009482829
DTC DETECTION LOGIC
Diagnosis Procedure
INFOID:0000000009482830
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 terminals.
4. Reconnect connector and perform self-diagnosis. Refer to
BRC-145, "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-194
< DTC/CIRCUIT DIAGNOSIS >
[TYPE 2]
HILL DESCENT CONTROL SWITCH
HILL DESCENT CONTROL SWITCH
Description
INFOID:0000000009482831
The hill descent control switch activates (turn ON) the hill descent control function when the hill descent con-
trol switch is pressed.
Component Function Check
INFOID:0000000009482832
1.
CHECK HILL DESCENT CONTROL SWITCH OPERATION
Turn ON/OFF the hill descent control switch and check that the hill descent control indicator lamp in the com-
bination meter turns ON/OFF correctly.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Go to diagnosis procedure. Refer to
BRC-194, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000009482833
Regarding Wiring Diagram information, refer to
BRC-211, "Wiring Diagram - WITH HILL DESCENT CON-
1.
CHECK HILL DESCENT CONTROL SWITCH
Perform the hill descent control switch component inspection. Refer to
BRC-195, "Component Inspection"
.
Is the inspection result normal?
YES
>> GO TO 2
NO
>> Replace hill descent control switch.
2.
CHECK HILL DESCENT CONTROL SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connector.
2. Check continuity between ABS actuator and electric unit (control unit) connector E125 (A) terminal 25 and
hill descent control switch connector M155 (B) terminal 2.
3. Check continuity between ABS actuator and electric unit (control unit) connector E125 (A) terminal 25 and
ground.
Is the inspection result normal?
YES
>> GO TO 3
NO
>> Repair or replace harness.
3.
CHECK HILL DESCENT CONTROL SWITCH GROUND
Condition
Hill descent control indicator lamp illumina-
tion status
Hill descent control switch: ON
ON
Hill descent control switch: OFF
OFF
ABS actuator and electric unit
(control unit)
Hill descent control switch
Continuity
Connector
Terminal
Connector
Terminal
E125 (A)
25
M155 (B)
2
Yes
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E125 (A)
25
Ground
No
HILL DESCENT CONTROL SWITCH
BRC-195
< DTC/CIRCUIT DIAGNOSIS >
[TYPE 2]
C
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BRC
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Check continuity between hill descent control switch connector
M155 terminal 1 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-234, "Removal and Installa-
.
NO
>> Replace combination meter. Refer to
MWI-84, "Removal and Installation"
Component Inspection
INFOID:0000000009482834
1.
CHECK HILL DESCENT CONTROL SWITCH
1. Turn ignition switch OFF.
2. Disconnect hill descent control switch connector.
3. Check continuity between hill descent control switch terminals.
Is the inspection result normal?
YES
>> Inspection End
NO
>> Replace hill descent control switch.
Special Repair Requirement
INFOID:0000000009482835
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-122, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-
>> 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-123, "CALIBRATION OF DECEL G SENSOR : Description"
.
>> END
Hill descent control switch
—
Continuity
Connector
Terminal
M155
1
Ground
Yes
AWFIA0220ZZ
Hill descent control
switch terminals
Condition
Continuity
1
− 2
Hill descent control switch is ON.
Yes
Hill descent control switch is OFF.
No
AWFIA0591ZZ
BRC-196
< DTC/CIRCUIT DIAGNOSIS >
[TYPE 2]
VDC OFF SWITCH
VDC OFF SWITCH
Description
INFOID:0000000009482836
VDC OFF switch can deactivate (turn OFF) the VDC/TCS function by pressing the VDC OFF switch.
Component Function Check
INFOID:0000000009482837
1.
CHECK VDC OFF SWITCH OPERATION
Press and release the VDC OFF switch, then press and release the VDC OFF switch again 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
BRC-196, "Diagnosis Procedure"
Diagnosis Procedure
INFOID:0000000009482838
Regarding Wiring Diagram information, refer to
BRC-211, "Wiring Diagram - WITH HILL DESCENT CON-
1.
CHECK VDC OFF SWITCH
Perform the VDC OFF switch component inspection. Refer to
BRC-197, "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) connector.
2. Check continuity between ABS actuator and electric unit (control unit) connector E125 terminal 6 and
VDC OFF switch connector M154 terminal 1.
3. Check continuity between ABS actuator and electric unit (control unit) connector E125 terminal 6 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: pressed and released
ON
VDC OFF switch: pressed and released
OFF
ABS actuator and electric unit
(control unit)
VDC OFF switch
Continuity
Connector
Terminal
Connector
Terminal
E125
6
M154
1
Yes
ABS actuator and electric unit (control unit)
—
Continuity
Connector
Terminal
E125
6
Ground
No
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