Infiniti M35/M45 Y50. Manual - part 336

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-45

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

4. 

CHECK YAW RATE/SIDE G SENSOR HARNESS

1.

Turn ignition switch OFF and disconnect Yaw rate/side G sensor connector M145 and ABS actuator and
electric unit (control unit) connector E30.

2.

Check continuity between Yaw rate/side G sensor harness con-
nector M145 and ABS actuator and electric unit (control unit)
harness connector E30.

OK or NG

OK

>> GO TO 5.

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

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.

OK or NG

OK

>>

●

Replace ABS actuator and electric unit (control unit).

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

NG

>>

●

Replace Yaw rate/side G sensor.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

SFIA3045E

ABS actuator and electric unit (control unit)

Yaw rate/side G sensor

Continuity

18

1

Yes

37

2

16

4

20

5

15

6

Vehicle condition

YAW RATE SEN (DATA MONITOR)

SIDE G-SENSOR (DATA MONITOR)

Stopped

Approx. 0 d/s

Approx. 0 m/s

2

Turning right

Negative value

Negative value

Turning left

Positive value

Positive value

BRC-46

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

Brake Fluid Level Switch Circuit

NFS000QW

CAUTION:

Check brake fluid level in brake reservoir tank before starting inspection.

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

1.

Check brake fluid level in brake reservoir tank. If brake fluid level is low, refill brake fluid.

2.

Check self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2. 

CHECK CONNECTOR

1.

Turn ignition switch OFF and disconnect brake fluid level switch connector E23 and ABS actuator and
electric unit (control unit) connector E30,   check terminal for deformation, disconnection, looseness, and
so on. If any malfunction is found, repair or replace terminal.

2.

Reconnect connector and perform self-diagnosis.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 3.

3. 

CHECK BRAKE FLUID LEVEL SWITCH 

1.

Turn ignition switch OFF and disconnect brake fluid level switch
connector E23.

2.

Check continuity between brake fluid level switch connector E23
terminal 1 and 2.

OK or NG

OK

>> GO TO 4.

NG

>>

●

Brake fluid level switch is malfunctioning. Replace reservoir tank. Refer to 

BR-14, "BRAKE

MASTER CYLINDER"

 .

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

Self-diagnosis results

BR FLUID LEVEL LOW

Brake fluid level switch

Condition

Continuity

1, 2

When brake fluid is full in the reservoir tank

No

When brake fluid is empty in the reservoir 
tank

Yes

SFIA2966E

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-47

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

4. 

CHECK BRAKE FLUID LEVEL SWITCH HARNESS

1.

Disconnect ABS actuator and electric unit (control unit) connec-
tor E30.

2.

Check continuity between brake fluid level switch harness con-
nector E23 and ABS actuator and electric unit (control unit) har-
ness connector E30.

OK or NG

OK

>> Connect connector securely and perform self-diagnosis.

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the
result shows “NO DTC IS DETECTED”.

RAS Control Unit Circuit (With RAS)

NFS000QX

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2. 

CHECK RAS CONTROL UNIT CIRCUIT

1.

Perform RAS control unit self-diagnosis. Repair or replace items indicated, then perform RAS control unit
self-diagnosis again. Refer to 

STC-31, "SELF-DIAGNOSIS PROCEDURE"

 .

2.

Perform ABS actuator and electric unit (control unit) self-diagnosis.

OK or NG

OK

>> INSPECTION END

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

ABS actuator and electric unit (control unit)

Brake fluid level switch

Continuity

43

1

Yes

Ground

No

Ground

2

Yes

SFIA3046E

Self-diagnosis results

RAS CIRCUIT

BRC-48

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

ICC Sensor Integrated Unit Circuit (With ICC)

NFS000QY

INSPECTION PROCEDURE

1. 

CHECK SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2. 

CHECK ICC SENSOR INTEGRATED UNIT CIRCUIT

1.

Perform ICC sensor integrated unit self-diagnosis. Repair or replace items indicated, then perform ICC
sensor integrated unit self-diagnosis again. Refer to 

ACS-29, "TROUBLE DIAGNOSIS - GENERAL

DESCRIPTION"

 . 

2.

Perform ABS actuator and electric unit (control unit) self-diagnosis.

OK or NG

OK

>> INSPECTION END

NG

>>

●

Repair or replace malfunctioning components.

●

Perform the self-diagnosis, and make sure that the result shows “NO DTC IS DETECTED”.

CAN Communication Circuit

NFS000R0

INSPECTION PROCEDURE

1. 

CHECK CONNECTOR

1.

Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector E30,
check terminal for deformation, disconnection, looseness, and so on. If any malfunction is found, repair or
replace terminal.

2.

Reconnect connector and perform self-diagnosis.

Note: Indicated only for vehicles with ICC.

Is above displayed on the self-diagnosis display?

YES

>> Print out self-diagnosis results and go to Refer to 

LAN-50, "CAN System Specification Chart"

 .

NO

>> INSPECTION END

Self-diagnosis results

ACC CONT

Self-diagnosis results

CAN COMM CIRCUIT

ST ANG SEN COM CIR

ACC COMM CIRCUIT (Note)