Nissan Titan. Manual - part 34

U1000 CAN COMM CIRCUIT

BRC-77

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

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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

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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 

BRC-78, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009883707

Regarding Wiring Diagram information, refer to 

BRC-92, "Wiring Diagram"

.

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]

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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 

MWI-27, "Diagnosis Descrip-

tion"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-116, "Removal and Installa-

tion"

.

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

POSITION : Description"

.

>> 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).

Refer to 

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 

BRC-80, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009883712

1.

CHECK SELF-DIAGNOSIS

Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to 

BRC-24, "CONSULT Function

(ABS)"

.

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 

MWI-27, "Diagnosis Descrip-

tion"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-116, "Removal and Installa-

tion"

.

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

POSITION : Description"

.

>> 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).

Refer to 

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.

×