Infiniti G37 Coupe. Manual - part 264

BRC-30

< FUNCTION DIAGNOSIS >

[VDC/TCS/ABS]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

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 MOTOR

• 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.

Test item

Display item

Display

On

Off

ABS MOTOR

MOTOR RELAY

On

Off

ACTUATOR RLY (Note)

On

On

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

BRC-31

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

COMPONENT DIAGNOSIS

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

Description

INFOID:0000000001635040

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:0000000001635041

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-31, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000001665601

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.

DTC

Display item

Malfunction detected condition

Possible cause

C1101

RR RH SENSOR-1

Circuit of rear RH wheel sensor is open. Or when the sen-
sor power voltage is outside the standard.

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

(control unit)

C1102

RR LH SENSOR-1

Circuit of rear LH wheel sensor is open. Or when the sen-
sor power voltage is outside the standard.

C1103

FR RH SENSOR-1

Circuit of front RH wheel sensor is open. Or when the 
sensor power voltage is outside the standard.

C1104

FR LH SENSOR-1

Circuit of front LH wheel sensor is open. Or when the 
sensor power voltage is outside the standard.

Self-diagnosis results

RR RH SENSOR-1

RR LH SENSOR-1

FR RH SENSOR-1

FR LH SENSOR-1

BRC-32

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

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

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.

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

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

BRC-33

< 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

>> Replace applicable wheel sensor.

NO

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

Component Inspection

INFOID:0000000001665602

1.

CHECK DATA MONITOR

On “DATA MONITOR”, select “FR LH SENSOR”, “FR RH SENSOR”, “RR LH SENSOR”, and “RR RH SEN-
SOR”, and check the vehicle speed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to diagnosis procedure. Refer to 

BRC-31, "Diagnosis Procedure"

.

Special Repair Requirement

INFOID:0000000001665603

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform the “ST ANG SEN ADJUSTMENT” in “WORK SUPPORT”, when replacing the ABS actuator
and electric unit (control unit).

>> END

Wheel sensor

—

Voltage

Connector

Terminal

E27 (Front RH)

1

Ground

8 V or more

E60 (Front LH)

B33 (Rear RH)

B34 (Rear LH)

Wheel sensor

Vehicle speed (DATA MONITOR)

FR LH SENSOR

Nearly matches the speedometer dis-
play (

±

10% or less)

FR RH SENSOR

RR LH SENSOR

RR RH SENSOR