Infiniti G37 Coupe. Manual - part 272

BRC-62

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1145, C1146 YAW RATE/SIDE G SENSOR

3.

Turn ignition switch ON or OFF and check voltage between yaw rate/side G sensor harness connector ter-
minal and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning components.

3.

CHECK YAW RATE/SIDE G SENSOR GROUND CIRCUIT

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace malfunctioning components.

4.

CHECK YAW RATE/SIDE G SENSOR HARNESS

1.

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

2.

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

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning components.

5.

CHECK DATA MONITOR

1.

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

2.

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

Is the inspection result normal?

YES

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

NO

>> Replace yaw rate/side G sensor.

Component Inspection

INFOID:0000000001635108

1.

CHECK DATA MONITOR

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

Yaw rate/side G sensor

—

Condition

Voltage

Connector

Terminal

M143

4

Ground

Ignition switch: ON

Battery voltage

Ignition switch: OFF

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)

SIDE G-SENSOR

(DATA MONITOR)

Vehicle stopped

Approx. 0 d/s

Approx. 0 m/s

2

Turning right

Negative value

Negative value

Turning left

Positive value

Positive value

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

BRC-61, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000001635109

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

YAW RATE SEN

(DATA MONITOR)

SIDE G-SENSOR

(DATA MONITOR)

Vehicle stopped

Approx. 0 d/s

Approx. 0 m/s

2

Turning right

Negative value

Negative value

Turning left

Positive value

Positive value

BRC-64

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1147, C1148, C1149, C1150 USV/HSV LINE

C1147, C1148, C1149, C1150 USV/HSV LINE

Description

INFOID:0000000001635110

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:0000000001635111

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-64, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001635112

1.

CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

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

3.

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

4.

Reconnect connectors and then perform the self-diagnosis.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 2.

NO

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

2.

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

1.

Turn ignition switch OFF.

2.

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

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.

Self-diagnosis results

USV LINE [FL-RR]

USV LINE [FR-RL]

HSV LINE [FL-RR]

HSV LINE [FR-RL]

C1147, C1148, C1149, C1150 USV/HSV LINE

BRC-65

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

3.

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace malfunctioning components.

3.

CHECK SOLENOID, VDC SWITCH-OVER VALVE AND ACUATOR RELAY GROUND CIRCUIT

Check continuity between ABS actuator and electric unit (control unit) harness connector terminals and
ground.

Is the inspection result normal?

YES

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

NO

>> Repair or replace malfunctioning components.

Component Inspection

INFOID:0000000001635113

1.

CHECK ACTIVE TEST

1.

Select each test menu item on ”ACTIVE TEST“.

2.

On the display, touch “Up”, “ACT UP”, and “ACT KEEP”, and check that the system operates as shown in
the table below.

*: On for 1 to 2 seconds after the touch, and then Off.

NOTE:

A brief moment of On/Off condition occurs every 20 seconds after ignition switch turned ON. This is not malfunction because it is
an operation for checking.

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E41

3

Ground

Battery voltage

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E41

1, 4

Ground

Existed

Test item

Display item

(Note)

Display

Up

ACT UP

ACT KEEP

FR RH ABS SOLENOID 
(ACT)

FR RH IN SOL

Off

Off

Off

FR RH OUT SOL

Off

Off

Off

USV [FR-RL]

Off

On

On

HSV [FR-RL]

Off

On*

Off

FR LH ABS SOLENOID 
(ACT)

FR LH IN SOL

Off

Off

Off

FR LH OUT SOL

Off

Off

Off

USV [FL-RR]

Off

On

On

HSV [FL-RR]

Off

On*

Off

RR RH ABS SOLENOID 
(ACT)

RR RH IN SOL

Off

Off

Off

RR RH OUT SOL

Off

Off

Off

USV [FL-RR]

Off

On

On

HSV [FL-RR]

Off

On*

Off

RR LH ABS SOLENOID 
(ACT)

RR LH IN SOL

Off

Off

Off

RR LH OUT SOL

Off

Off

Off

USV [FR-RL]

Off

On

On

HSV [FR-RL]

Off

On*

Off