Nissan Xterra. Manual - part 97

C1111 ABS MOTOR, MOTOR RELAY SYSTEM

BRC-45

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

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C1111 ABS MOTOR, MOTOR RELAY SYSTEM

Description

INFOID:0000000009482600

PUMP

The pump returns the brake fluid stored in the reservoir to the master cylinder by reducing the pressure. 

MOTOR

The motor drives the pump according to the signals transmitted by the ABS actuator and electric unit (control

unit). 

DTC Logic

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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-45, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009482602

Regarding Wiring Diagram information, refer to 

BRC-90, "Wiring Diagram - WITHOUT HILL DESCENT CON-

TROL/HILL START ASSIST"

.

1.

CONNECTOR INSPECTION

1. Turn ignition switch OFF.

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

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

replace terminals.

4. Reconnect connectors and then perform the self-diagnosis. Refer to 

BRC-29, "CONSULT Function

(ABS)"

.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 2

NO

>> Poor connection of connector terminals. Repair or replace connector.

2.

CHECK ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

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

3. Check voltage between the ABS actuator and electric unit (control unit) connector E125 terminal 1 and

ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1111

PUMP MOTOR

During the actuator motor operating with ON, when the 
actuator motor turns OFF, or when the control line for ac-
tuator motor relay is open.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

During the actuator motor operating with OFF, when the 
actuator motor turns ON, or when the control line for relay 
is shorted to ground.

Self-diagnosis results

PUMP MOTOR

BRC-46

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

C1111 ABS MOTOR, MOTOR RELAY SYSTEM

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace malfunctioning components.

3.

CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT

Check continuity between ABS actuator and electric unit (control unit) connector E125 terminals 16, 47 and

ground.

Is the inspection result normal?

YES

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

BRC-113, "Removal and Installa-

tion"

.

NO

>> Repair or replace malfunctioning components.

Component Inspection

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1.

CHECK ACTIVE TEST

1. On “ACTIVE TEST”, select “ABS MOTOR”.

2. Touch On and Off on screen. Make sure motor relay and actuator relay operate as shown in table below.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-45, "Diagnosis Procedure"

.

Special Repair Requirement

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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-12, "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-13, "CALIBRATION OF DECEL G SENSOR : Description"

.

>> END

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E125

1

Ground

Battery voltage

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E125

16, 47

Ground

Yes

Operation

On

Off

MOTOR RELAY

On

Off

ACTUATOR RLY

On

On

C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR

BRC-47

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

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C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR

Description

INFOID:0000000009482605

The yaw rate/side/decel G sensor detects the yaw rate/side/decel G affecting the vehicle, and transmits the

data to the ABS actuator and electric unit (control unit) as an analog voltage signal.

DTC Logic

INFOID:0000000009482606

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-47, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009482607

Regarding Wiring Diagram information, refer to 

BRC-90, "Wiring Diagram - WITHOUT HILL DESCENT CON-

TROL/HILL START ASSIST"

.

CAUTION:

• Sudden turns (such as spin turns, acceleration turns), drifting, etc. when VDC function is OFF may

cause the yaw rate/side/decel G sensor system to indicate a malfunction. This is not a malfunction if

normal operation can be resumed after restarting the engine.

• If vehicle is on turn table at entrance to parking garage, or on other moving surface, SLIP indicator

lamp may illuminate and CONSULT self-diagnosis may indicate yaw rate sensor system malfunction.

However, in this case there is no malfunction in yaw rate sensor system. Take vehicle off of turn

table or other moving surface, and start engine. Results will return to normal.

1.

CONNECTOR INSPECTION

1. Disconnect the ABS actuator and electric unit (control unit) connector and yaw rate/side/decel G sensor

connector. 

2. Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace as necessary.

2.

YAW RATE/SIDE/DECEL G SENSOR HARNESS INSPECTION

DTC

Display item

Malfunction detected condition

Possible cause

C1113

G-SENSOR

Longitudinal G-sensor is malfunctioning, or signal line of 
longitudinal G-sensor is open or shorted.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• Yaw rate/side/decel G sensor

C1145

YAW RATE SENSOR

Yaw rate sensor is malfunctioning, or the yaw rate sensor 
signal line is open or shorted.

C1146

SIDE G-SEN CIRCUIT

Side G sensor is malfunctioning, or circuit of side G sen-
sor is open or shorted.

Self-diagnosis results

G-SENSOR

YAW RATE SENSOR

SIDE G-SEN CIRCUIT

BRC-48

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

C1113, C1145, C1146 YAW RATE/SIDE/DECEL G SENSOR

Check continuity between the ABS actuator and electric unit (control unit) connector E125 terminals 18, 19,

22, 29 and the yaw rate/side/decel G sensor connector B73 terminals 3, 2, 4, 1.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace as necessary.

3.

YAW RATE/SIDE/DECEL G SENSOR INSPECTION

Perform the yaw rate/side/decel G sensor component inspection. Refer to 

BRC-48, "Component Inspection"

.

Is the inspection result normal?

YES

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

BRC-113, "Removal and Instal-

lation"

.

NO

>> Replace the yaw rate/side/decel G sensor. Refer to 

BRC-116, "Removal and Installation"

.

Component Inspection

INFOID:0000000009482608

1.

CHECK DATA MONITOR

Select “YAW RATE SEN”, “SIDE G-SENSOR”, “DECEL G-SEN” in “DATA MONITOR” and check yaw rate/

side/decel G sensor signal.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-47, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000009482609

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-12, "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-13, "CALIBRATION OF DECEL G SENSOR : Description"

.

>> END

ABS actuator and electric unit (control unit)

Yaw rate/side/decel G sensor

Continuity

Connector

Terminal

Connector

Terminal

E125 

18

B73

3

Yes

19

2

22

4

29

1

Vehicle condition

YAW RATE SEN

(DATA MONITOR)

SIDE G-SENSOR

(DATA MONITOR)

DECEL G-SEN

(DATA MONITOR)

Stopped

-4 to +4 deg/s

-1.1 to +1.1 m/s

-0.08 G to +0.08 G

Turning right

Negative value

Negative value

-

Turning left

Positive value

Positive value

-

Speed up

-

-

Negative value

Speed down

-

-

Positive value