Infiniti EX35. Manual - part 337

C1145, C1146 YAW RATE/SIDE G SENSOR

BRC-63

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

C1145, C1146 YAW RATE/SIDE G SENSOR

Description

INFOID:0000000003132941

The yaw rate/side G sensor detects the yaw rate/side 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:0000000003132942

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

1.

Turn the ignition switch ON.

2.

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

Is DTC “C1145” or “C1146” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-63, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003132943

CAUTION:

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

OFF switch “ON”) may cause yaw rate/side G sensor system to indicate a malfunction. However, this
is not a malfunction, if normal operation can be resumed after restarting engine. Then erase memory
of self-diagnosis.

• If vehicle is on turn-table at entrance to parking garage, or on other moving surface, VDC OFF indica-

tor lamp may illuminate and CONSULT-III self-diagnosis may indicate yaw rate sensor system mal-
function. 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 the engine. Results will return to normal.

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

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

3.

Disconnect yaw rate/side G sensor connector.

4.

Check terminal for deformation, disconnection, looseness, etc.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK YAW RATE/SIDE G SENSOR POWER SUPPLY CIRCUIT

1.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

2.

Check the voltage between yaw rate/side G sensor harness connector and ground.

3.

Turn the ignition switch OFF.

4.

Check the voltage between yaw rate/side G sensor harness connector and ground.

DTC

Display item

Malfunction detected condition

Possible cause

C1145

YAW RATE SENSOR

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

• Harness or connector
• ABS actuator and electric unit 

(control unit)

• Yaw rate/side G sensor

C1146

SIDE G-SEN CIRCUIT

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

Yaw rate/side G sensor

—

Voltage

Connector

Terminal

M143

4

Ground

Battery voltage

BRC-64

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1145, C1146 YAW RATE/SIDE G SENSOR

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

3.

CHECK YAW RATE/SIDE G SENSOR GROUND CIRCUIT

Check the continuity between yaw rate/side G sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace damaged parts.

4.

CHECK YAW RATE/SIDE G SENSOR HARNESS

Check the continuity between yaw rate/side G sensor harness connector and ABS actuator and electric unit
(control unit) harness connector.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace damaged parts. Refer to 

BRC-105, "Precautions for Harness Repair"

.

5.

CHECK DATA MONITOR

1.

Connect yaw rate/side G sensor connector and ABS actuator and electric unit (control unit) connector.

2.

Check yaw rate/side G sensor signal. Refer to 

BRC-64, "Component Inspection"

.

Is the inspection result normal?

YES

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

NO

>> Replace yaw rate/side G sensor.

Component Inspection

INFOID:0000000003132944

1.

CHECK DATA MONITOR

Select “YAW RATE SEN”, “SIDE G-SENSOR” in “DATA MONITOR” and check yaw rate/side G sensor signal.

Yaw rate sensor

Yaw rate/side G sensor

—

Voltage

Connector

Terminal

M143

4

Ground

Approx. 0 V

Yaw rate/side G sensor

—

Continuity

Connector

Terminal

M143

1

Ground

Existed

ABS actuator and electric unit (control unit)

Yaw rate/side G sensor

Continuity

Connector

Terminal

Connector

Terminal

E41

25

M143

2

Existed

45

3

Vehicle condition

YAW RATE SEN

(DATA MONITOR)

Vehicle stopped

Approx. 0 d/s

Vehicle turning right

Negative value

Vehicle turning left

Positive value

C1145, C1146 YAW RATE/SIDE G SENSOR

BRC-65

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

Side G sensor

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to diagnosis procedure. Refer to 

BRC-63, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000003430145

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the neutral position adjustment for the steering angle sensor, when replacing the ABS actua-
tor and electric unit (control unit). Refer to 

BRC-8, "ADJUSTMENT OF STEERING ANGLE SENSOR NEU-

TRAL POSITION : Description"

.

>> END

Vehicle condition

SIDE G-SENSOR

(DATA MONITOR)

Vehicle stopped

Approx. 0 m/s

2

Vehicle turning right

Negative value

Vehicle turning left

Positive value

BRC-66

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1147, C1148, C1149, C1150 USV/HSV LINE

C1147, C1148, C1149, C1150 USV/HSV LINE

Description

INFOID:0000000003132946

USV1, USV2 (CUT VALVE)

The cut valve shuts off the normal brake fluid path from the master cylinder, when VDC/TCS is activated.

HSV1, HSV2 (SUCTION VALVE)

The suction valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated.

DTC Logic

INFOID:0000000003132947

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

1.

Turn the ignition switch ON.

2.

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

Is DTC “C1147”, “C1148”, “C1149” or “C1150” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-66, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003132948

1.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

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

3.

Check terminal for deformation, disconnection, looseness, etc.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace damaged parts.

2.

CHECK SOLENOID, VDC SWITCH-OVER VALVE AND ACTUATOR RELAY POWER SUPPLY CIRCUIT

Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace damaged parts.

DTC

Display item

Malfunction detected condition

Possible cause

C1147

USV LINE[FL-RR]

VDC switch-over solenoid valve (USV1) on the primary 
side is open circuit or shorted, or the control line is open 
or shorted to the power supply or the ground.

• Harness or connector
• ABS actuator and electric unit 

(control unit)

C1148

USV LINE[FR-RL]

VDC switch-over solenoid valve (USV2) on the primary 
side is open circuit or shorted, or the control line is open 
or shorted to the power supply or the ground.

C1149

HSV LINE[FL-RR]

VDC switch-over solenoid valve (HSV1) on the primary 
side is open circuit or shorted, or the control line is open 
or shorted to the power supply or the ground.

C1150

HSV LINE[FR-RL]

VDC switch-over solenoid valve (HSV2) on the primary 
side is open circuit or shorted, or the control line is open 
or shorted to the power supply or the ground.

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E41

3

Ground

Battery voltage