Infiniti G37 Coupe. Manual - part 267

BRC-42

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1114 ACTUATOR RELAY SYSTEM

C1114 ACTUATOR RELAY SYSTEM

Description

INFOID:0000000001635062

Activates or deactivates each solenoid valve according to the signals transmitted by the ABS actuator and
electric unit (control unit). 

DTC Logic

INFOID:0000000001635063

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-42, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001635064

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.

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

DTC

Display item

Malfunction detected condition

Possible cause

C1114

MAIN RELAY

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

• Harness or connector
• ABS actuator and electric unit 

(control unit)

During the actuator relay operating with ON, when the 
actuator relay turns ON, or when the control line for the 
relay is open.

Self-diagnosis results

MAIN RELAY

ABS actuator and electric unit (control unit)

—

Voltage

Connector

Terminal

E41

3

Ground

Battery voltage

C1114 ACTUATOR RELAY SYSTEM

BRC-43

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

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:0000000001664572

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 operates as shown in table
below.

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

BRC-40, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000001635066

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

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E41

1, 4

Ground

Existed

Test item

Display item

Display

On

Off

ABS MOTOR

MOTOR RELAY

On

Off

ACTUATOR RLY (Note)

On

On

BRC-44

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1115 WHEEL SENSOR

C1115 WHEEL SENSOR

Description

INFOID:0000000001664566

When the sensor rotor rotates, the magnetic field changes. It converts the magnetic field changes to current
signals (rectangular wave) and transmits them to the ABS actuator and electric unit (control unit). 

DTC Logic

INFOID:0000000001635068

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-44, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001665620

CAUTION:

Do not check between wheel sensor terminals.

1.

CHECK TIRES

Check air pressure, wear and size.

Are air pressure, wear and size within standard?

YES

>> GO TO 2.

NO

>> Adjust air pressure, or replace tire. 

2.

CHECK SENSOR AND SENSOR ROTOR

• Check sensor rotor for damage. 
• Check wheel sensor for damage, disconnection or looseness.

Are the sensor and sensor rotor normal?

YES

>> GO TO 3.

NO

>> Repair wheel sensor mount or replace sensor rotor. Then perform the self-diagnosis.

3.

CHECK CONNECTOR

1.

Turn ignition switch OFF.

2.

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

3.

Disconnect malfunctioning wheel sensor connector.

4.

Check terminal to see if it is deformed, disconnected, loose, etc., Repair or replace it if any malfunction
condition is found.

5.

Reconnect connectors and then perform the self-diagnosis.

Is any item indicated on the self-diagnosis display?

YES

>> GO TO 4.

NO

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

4.

CHECK WHEEL SENSOR HARNESS

DTC

Display item

Malfunction detected condition

Possible cause

C1115

ABS SENSOR
[ABNORMAL SIGNAL]

When wheel sensor input signal is malfunctioning.

• Harness or connector
• Wheel sensor
• ABS actuator and electric unit 

(control unit)

Self-diagnosis results

ABS SENSOR [ABNORMAL SIGNAL]

C1115 WHEEL SENSOR

BRC-45

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

1.

Turn ignition switch OFF.

2.

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

3.

Disconnect malfunctioning wheel sensor connector.

4.

Check continuity between terminals. (Also check continuity when steering wheel is turned right and left
and when sensor harness inside the wheel house is moved.)

Measurement terminal for power supply circuit

Measurement terminal for signal circuit

Measurement terminal for ground circuit

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair or replace malfunctioning components.

5.

CHECK WHEEL SENSOR POWER SUPPLY CIRCUIT

1.

Disconnect malfunctioning wheel sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between wheel sensor harness connector power supply terminal and ground.

Is the inspection result normal?

YES

>> Replace applicable wheel sensor.

NO

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

Component Inspection

INFOID:0000000001665621

1.

CHECK DATA MONITOR

ABS actuator and electric unit (control unit)

Wheel sensor

Continuity

Connector

Terminal

Connector

Terminal

E41

9

E27 (Front RH)

1

Existed

26

E60 (Front LH)

7

B33 (Rear RH)

6

B34 (Rear LH)

ABS actuator and electric unit (control unit)

Wheel sensor

Continuity

Connector

Terminal

Connector

Terminal

E41

10

E27 (Front RH)

2

Existed

5

E60 (Front LH)

29

B33 (Rear RH)

27

B34 (Rear LH)

ABS actuator and electric unit (control unit)

Continuity

Connector

Terminal

Connector

Terminal

E41

9, 10

E41

1, 4

Not existed

26, 5

7, 29

6, 27

Wheel sensor

—

Voltage

Connector

Terminal

E27 (Front RH)

1

Ground

8 V or more

E60 (Front LH)

B33 (Rear RH)

B34 (Rear LH)