Nissan Frontier D40. Manual - part 140

BRC-258

< COMPONENT DIAGNOSIS >

[TYPE 3]

C1187 DIFFERENTIAL LOCK CONTROL UNIT

C1187 DIFFERENTIAL LOCK CONTROL UNIT

Description

INFOID:0000000005275332

The differential lock control unit is connected to the ABS actuator and electric unit (control unit) via CAN lines.
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:0000000005275333

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-258, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005275334

1.

CONNECTOR INSPECTION

1.

Turn ignition switch OFF.

2.

Disconnect ABS actuator and electric unit (control unit) connector.

3.

Check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found, repair
or replace terminals.

4.

Reconnect connector and perform self-diagnosis. Refer to 

BRC-212, "CONSULT-III Function (ABS)"

.

Is above displayed on the self-diagnosis display?

YES

>> Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

NO

>> Inspection End

DTC

Display item

Malfunction detected condition

Possible cause

C1187

ABS DIFLOCK CONTROL-
LER NG

Differential lock controller malfunction.

• Harness or connector
• CAN communication line
• Differential lock control unit
• ABS actuator and electric unit 

(control unit)

Self-diagnosis results

ABS DIFLOCK CONTROLLER NG

Self-diagnosis results

ABS DIFLOCK CONTROLLER NG

U1000 CAN COMM CIRCUIT

BRC-259

< COMPONENT DIAGNOSIS >

[TYPE 3]

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000005275335

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:0000000005275336

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000005275337

1.

CONNECTOR INSPECTION

1.

Turn ignition switch OFF.

2.

Disconnect the ABS actuator and electric unit (control unit) connector.

3.

Check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found, repair
or replace terminals.

4.

Reconnect connector and perform self-diagnosis. Refer to 

BRC-212, "CONSULT-III 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-260

< COMPONENT DIAGNOSIS >

[TYPE 3]

HILL DESCENT CONTROL SWITCH

HILL DESCENT CONTROL SWITCH

Description

INFOID:0000000005275339

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:0000000005275340

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-260, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005275341

Regarding Wiring Diagram information, refer to 

BRC-275, "Wiring Diagram - BRAKE CONTROL SYSTEM -

WITH HILL DESCENT CONTROL/HILL START ASSIST"

.

1.

CHECK HILL DESCENT CONTROL SWITCH

Perform the hill descent control switch component inspection. Refer to 

BRC-261, "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) connec-
tor.

2.

Check continuity between ABS actuator and electric unit (control
unit) connector E127 (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 E127 (A) terminal 25 and ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness.

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

E127 (A)

25

M155 (B)

2

Yes

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E127 (A)

25

Ground

No

AWFIA0219ZZ

HILL DESCENT CONTROL SWITCH

BRC-261

< COMPONENT DIAGNOSIS >

[TYPE 3]

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3.

CHECK HILL DESCENT CONTROL SWITCH GROUND

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 

MWI-23, "Diagnosis Descrip-

tion"

.

Is the inspection result normal?

YES

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

BRC-300, "Removal and Installa-

tion"

.

NO

>> Replace combination meter. Refer to 

MWI-95, "Removal and Installation"

.

Component Inspection

INFOID:0000000005275342

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:0000000005549810

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-189, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL 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-190, "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