Infiniti QX56 (JA60). Manual - part 128

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-25

< FUNCTION DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

P POSI SIG
(On/Off)

–

–

×

Shift position judged by transmission range switch 
signal.

CV1
(On/Off)

–

–

×

Front side switch-over solenoid valve (cut valve) (On/
Off) status is displayed.

CV2
(On/Off)

–

–

×

Rear side switch-over solenoid valve (cut-valve) (On/
Off) status is displayed.

SV1
(On/Off)

–

–

×

Front side switch-over solenoid valve (suction valve) 
(On/Off) status is displayed.

SV2
(On/Off)

–

–

×

Rear side switch-over solenoid valve (suction valve) 
(On/Off) status is displayed.

2WD/4WD
(2WD/4WD)

–

–

×

It recognizes on software whether it is 2WD and 
whether it is in 4WD state.

ACCEL POS SIG
(%)

×

–

×

Throttle valve open/close status judged by CAN com-
munication signal is displayed.

SIDE G-SENSOR
 (m/s

2

)

×

–

×

Transverse acceleration detected by side G-sensor is 
displayed. 

STR ANGLE SIG
(deg)

×

–

×

Steering angle detected by steering angle sensor is 
displayed.

BST OPER SIG
(On/Off)

–

–

×

Active booster operation (On/Off) status is displayed.

PRESS SENSOR
(bar)

×

–

×

Brake pressure detected by pressure sensor is dis-
played.

EBD SIGNAL
(On/Off)

–

–

×

EBD operation (On/Off) status is displayed.

ABS SIGNAL
(On/Off)

–

–

×

ABS operation (On/Off) status is displayed.

TCS SIGNAL
(On/Off)

–

–

×

TCS operation (On/Off) status is displayed.

VDC SIGNAL
(On/Off)

–

–

×

VDC operation (On/Off) status is displayed.

EBD FAIL SIG
(On/Off)

–

–

×

EBD fail signal (On/Off) status is displayed.

ABS FAIL SIG
(On/Off)

–

–

×

ABS fail signal (On/Off) status is displayed.

TCS FAIL SIG
(On/Off)

–

–

×

TCS fail signal (On/Off) status is displayed.

VDC FAIL SIG
(On/Off)

–

–

×

VDC fail signal (On/Off) status is displayed.

CRANKING SIG
(On/Off)

–

–

×

The input state of the key SW START position signal 
is displayed.

FLUID LEV SW
(On/Off)

×

–

×

Brake fluid level switch (On/Off) status is displayed.

PRESS SEN2
(bar)

–

–

×

Brake pressure detected by pressure sensor is dis-
played.

DELTA S SEN
(mm)

–

–

×

The amount of stroke sensor movements in the active 
booster detected by DELTA S SEN is displayed.

RELEASE SW NO
(On/Off)

–

–

×

Release switch signal (On/Off) status is displayed. 
“On” indicates that the brake pedal is depressed. “Off” 
indicates that the brake pedal is released.

Item

(Unit)

Data monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELECTION

FROM MENU

BRC-26

< FUNCTION DIAGNOSIS >

[VDC/TCS/ABS]

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

×: Applicable
–: Not applicable

ACTIVE TEST MODE

CAUTION:

• Do not perform active test while driving vehicle.

• Make sure to completely bleed air from brake system.

• The active test cannot be performed with the ABS warning lamp, VDC OFF indicator lamp, SLIP indi-

cator lamp or brake warning lamp on.

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

during active test.

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” is displayed 10 seconds after operation start.

• After “TEST IS STOPPED” is displayed, to perform test again, touch BACK.

Test Item

SOLENOID VALVE

• When performing an active test of the ABS function, select the “MAIN SIGNALS” for each test item.

• For ABS solenoid valve, touch “Up”, “Keep”, and “Down” on the display screen. For ABS solenoid valve

(ACT), touch “Up”, “ACT UP”, “ACT KEEP” and confirm that solenoid valves operate as shown in the table

below.

RELEASE SW NC
(On/Off)

–

–

×

Release switch signal (On/Off) status is displayed. 
“Off” indicates that the brake pedal is depressed. “On” 
indicates that the brake pedal is released.

OHB FAIL
(On/Off)

–

–

×

OHB fail status is displayed.

HBA FAIL
(On/Off)

–

–

×

HBA fail status is displayed.

OHB SIG
(On/Off)

–

–

×

OHB operation (On/Off) status is displayed.

HBA SIG
(On/Off)

–

–

×

HBA operation (On/Off) status is displayed.

STP OFF RLY
(On/Off)

–

–

×

Stop lamp relay signal (On/Off) status is displayed.

Item

(Unit)

Data monitor item selection

Remarks

ECU INPUT

SIGNALS

MAIN

SIGNALS

SELECTION

FROM MENU

Operation

ABS solenoid valve

ABS solenoid valve (ACT)

Up

Keep

Down

Up

ACT UP

ACT KEEP

FR RH SOL

FR RH IN SOL

Off

On

On

—

—

—

FR RH OUT SOL

Off

Off

On*

—

—

—

FR LH SOL

FR LH IN SOL

Off

On

On

—

—

—

FR LH OUT SOL

Off

Off

On*

—

—

—

RR RH SOL

RR RH IN SOL

Off

On

On

—

—

—

RR RH OUT SOL

Off

Off

On*

—

—

—

RR LH SOL

RR LH IN SOL

Off

On

On

—

—

—

RR LH OUT SOL

Off

Off

On*

—

—

—

FR RH ABS SOLENOID (ACT)

FR RH IN SOL

—

—

—

Off

Off

Off

FR RH OUT SOL

—

—

—

Off

Off

Off

CV1

—

—

—

Off

On

On

SV1

—

—

—

Off

On*

Off

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL 

UNIT)]

BRC-27

< FUNCTION DIAGNOSIS >

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

N

O

P

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

ABS MOTOR

• Touch “On” and “Off” on screen. Make sure motor relay and actuator relay operates as shown in table below.

BOOSTER DRIVE

• Touch “Up” and “Down” on the screen. Check that booster drive operates as shown in table below.

CAUTION:

Perform active test subject to the conditions below.

• Do not operate brake pedal during active test.

• Make sure the engine revolution is over 500 rpm.

• Make sure the vehicle is not moving.

FR LH ABS SOLENOID (ACT)

FR LH IN SOL

—

—

—

Off

Off

Off

FR LH OUT SOL

—

—

—

Off

Off

Off

CV1

—

—

—

Off

On

On

SV1

—

—

—

Off

On*

Off

RR RH ABS SOLENOID (ACT)

RR RH IN SOL

—

—

—

Off

Off

Off

RR RH OUT SOL

—

—

—

Off

Off

Off

CV2

—

—

—

Off

On

On

SV2

—

—

—

Off

On*

Off

RR LH ABS SOLENOID (ACT)

RR LH IN SOL

—

—

—

Off

Off

Off

RR LH OUT SOL

—

—

—

Off

Off

Off

CV2

—

—

—

Off

On

On

SV2

—

—

—

Off

On*

Off

Operation

ABS solenoid valve

ABS solenoid valve (ACT)

Up

Keep

Down

Up

ACT UP

ACT KEEP

Operation

On

Off

MOTOR RELAY

On

Off

ACTUATOR RLY

On

On

Operation

Up

Down

BST OPER SIG

On

Off

PRESS SENSOR

50 

± 5 bar

0 bar

PRESS SEN 2

50 

± 5 bar

0 bar

STOP LAMP SW

On

Off

STP OFF RLY

Off

Off

BRC-28

< COMPONENT DIAGNOSIS >

[VDC/TCS/ABS]

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

COMPONENT DIAGNOSIS

C1101, C1102, C1103, C1104 WHEEL SENSOR-1

Description

INFOID:0000000005147963

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:0000000005147964

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-28, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000005147965

Regarding Wiring Diagram information, refer to 

BRC-92, "Wiring Diagram - BRAKE CONTROL SYSTEM -"

.

CAUTION:

Do not check between wheel sensor terminals.

1.

CONNECTOR INSPECTION

1. Disconnect the ABS actuator and electric unit (control unit) connector and wheel sensor of malfunctioning

code. 

2. Check the terminals for deformation, disconnection, looseness or damage.
Is the inspection result normal?

YES

>> GO TO 2

NO

>> Repair or replace as necessary.

2.

CHECK WHEEL SENSOR OUTPUT SIGNAL

1. Connect ABS active wheel sensor tester (J-45741) to wheel sensor using appropriate adapter.

2. Turn on the ABS active wheel sensor tester power switch.

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