Infiniti FX35, FX50 (S51). Manual - part 254

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-47

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

NOTE:

1: 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.

2: With LDP models.

ACTIVE TEST

CAUTION:

• Never perform active test while driving vehicle.
• Make sure to completely bleed air from brake system.
• The active test cannot be started when ABS warning lamp, VDC OFF indicator lamp, SLIP indicator

lamp and brake warning lamp are ON.

• ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp and brake warning lamp are ON

during active test.

• Erase memory of the lane camera unit after implementing active test. Refer to 

CCS-463, "CONSULT-

III Function (LANE CAMERA)"

.

NOTE:
• When active test is performed while depressing the pedal, the pedal depression amount will change. This is

normal. (Only solenoid valve and ABS motor.)

• “TEST IS STOPPED” in “ABS” with CONSULT-III is displayed 10 seconds after operation start.
• After “TEST IS STOPPED” in “ABS” with CONSULT-III is displayed, to perform test again.

Test Item

ABS SOLENOID VALVE

• Select “Up”, “Keep” and “Down” of “ACTIVE TEST” in “ABS” with CONSULT-III. Then use screen monitor to

check that solenoid valve operates as shown in the table below.

LDP) LDW SW
(On/Off) (Note 2)

×

×

LDW switch status received from lane camera unit via 
CAN communication

LDP) SHIFT POSITION
(OFF/P/R/N/D/MM 1st – MM 7th) 
(Note 2)

×

×

Shift position received from TCM via CAN communication

LDP) TURN SIGNAL
(Off/LH/RH/LH&RH) (Note 2)

×

×

Turn signal operating condition received from BCM via 
CAN communication

Monitor item (Unit)

SELECT MONITOR ITEM

Remarks

ECU INPUT 

SIGNALS

MAIN SIGNALS

Test item

Display item

Display (Note)

Up

Keep

Down

FR RH SOL

FR RH IN SOL

Off

On

On

FR RH OUT SOL

Off

Off

On*

USV[FR-RL]

Off

Off

Off

HSV[FR-RL]

Off

Off

Off

FR LH SOL

FR LH IN SOL

Off

On

On

FR LH OUT SOL

Off

Off

On*

USV[FL-RR]

Off

Off

Off

HSV[FL-RR]

Off

Off

Off

RR RH SOL

RR RH IN SOL

Off

On

On

RR RH OUT SOL

Off

Off

On*

USV[FL-RR]

Off

Off

Off

HSV[FL-RR]

Off

Off

Off

BRC-48

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

*: On for 1 to 2 seconds after the select, 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 SOLENOID VALVE (ACT)

• Select “Up”, “ACT UP” and “ACT KEEP” of “ACTIVE TEST” in “ABS” with CONSULT-III. Then use screen

monitor to check that solenoid valve operates as shown in the table below.

*: On for 1 to 2 seconds after the select, 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 MOTOR

• Select “On” and “Off” of “ACTIVE TEST” in “ABS” with CONSULT-III. 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.

ECU IDENTIFICATION

RR LH SOL

RR LH IN SOL

Off

On

On

RR LH OUT SOL

Off

Off

On*

USV[FR-RL]

Off

Off

Off

HSV[FR-RL]

Off

Off

Off

Test item

Display item

Display (Note)

Up

Keep

Down

Test item

Display item

Display (Note)

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

Test item

Display item

Display

On

Off

ABS MOTOR

MOTOR RELAY

On

Off

ACTUATOR RLY (Note)

On

On

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-49

< SYSTEM DESCRIPTION >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

ABS actuator and electric unit (control unit) part number can be read.

SPECIFIC FUNCTION

Specific Data Monitor

Specific data monitor displays specific LDP operating conditions.

Monitor item (Unit)

Remarks

YAW RATE SEN
(d/s)

Yaw rate detected by yaw rate/side G sensor

LDP) YAW ORDER
(

×

100Nm)

Calculated target yaw moment

LDP) WARN REQ
(On/Off)

Status of warning request that transmits to lane camera unit via CAN communi-
cation

LDP) WARN control
(On/Off)

Status of warning main controller for LDP

LDP) REDY signal
(On/Off)

Status of internal judgment by LDP controller [ABS actuator and electric unit 
(control unit)]

LDP) STATUS signal
(STANDBY/WARN/MASK/Off)

Status of internal judgment by LDP controller [ABS actuator and electric unit 
(control unit)]

LDP) Camera lost
(Detect/Deviate/Both)

Lane marker detected condition received from lane camera unit via CAN com-
munication

LDP) Lane unclear
(On/Off) 

Lane marker condition received from lane camera unit via CAN communication

BRC-50

< DTC/CIRCUIT DIAGNOSIS >

[VDC/TCS/ABS]

C1101, C1102, C1103, C1104 WHEEL SENSOR

DTC/CIRCUIT DIAGNOSIS

C1101, C1102, C1103, C1104 WHEEL SENSOR

Description

INFOID:0000000005234498

When the sensor rotor rotates, the magnetic field changes. Wheel sensor 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:0000000005234499

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

DTC REPRODUCTION PROCEDURE

1.

Start the engine and drive the vehicle at 30 km/h (19 MPH) or more for approximately 1 minute.

2.

Perform self-diagnosis for “ABS” with CONSULT-III.

Is DTC “C1101”, “C1102”, “C1103” or “C1104” detected?

YES

>> Proceed to diagnosis. Refer to 

BRC-50, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000005234500

CAUTION:

Never check between wheel sensor terminals.

1.

CHECK TIRES

Check air pressure, wear and size. Refer to 

WT-80, "Tire Air Pressure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts. 

2.

CHECK SENSOR AND SENSOR ROTOR

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

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair wheel sensor mount or replace sensor rotor. Then perform self-diagnosis for "ABS" with

CONSULT-III.

3.

CHECK CONNECTOR

1.

Turn the ignition switch OFF.

2.

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

3.

Disconnect malfunctioning wheel sensor harness connector.

4.

Check terminal to see if it is deformed, disconnected, looseness, etc.

Is the inspection result normal?

YES

>> GO TO 4.

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.