Infiniti Q45. Manual — part 272

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-53

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

Brake Fluid Level Switch

NFS000DA

CAUTION:

Check brake fluid level before inspection start.

INSPECTION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

With CONSULT-II

1.

Turn ignition switch “ON”. (Do not start engine.)

2.

Select “SELF-DIAG RESULTS” mode for “VDC” with CONSULT-II.

3.

Touch “ERASE”.

4.

Turn ignition switch “OFF” and wait at least 10 seconds.

5.

Check the self-diagnostic results.

Is above displayed in the self-diagnosis display?

YES

>> GO TO 2.

NO

>> INSPECTION END

2.

CHECK CONNECTOR

1.

Turn ignition switch “OFF”.

2.

Disconnect brake fluid level switch connector E74 and VDC/TCS/ABS control unit connector E218.

3.

Reconnect connectors securely, then perform VDC/TCS/ABS control unit self-diagnosis again.

Does anything appear on self-diagnosis results display?

YES

>> Poor connector connections. Repair or replace connectors.

NO

>> GO TO 3.

3.

CHECK HARNESS BETWEEN BRAKE FLUID LEVEL SWITCH AND COMBINATION METER

1.

Turn ignition switch “OFF”.

2.

Disconnect combination meter connector M43.

3.

Check continuity between brake fluid level switch harness con-
nector E74 and combination meter harness connector M43.

OK or NG

OK

>> Brake fluid level switch is malfunctioning. Replace reser-

voir tank assembly Refer to

BR-14, "Disassembly and

Assembly"

.

NG

>> If open or short in harness, repair or replace the har-

ness.

Self-diagnosis results

BR FLUID LEVEL LOW

51 - 1

: Continuity should exist.

2 - Ground

: Continuity should exist.

51 - Ground

: Continuity should not exist.

SFIA2615E

BRC-54

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

VDC OFF Switch

NFS000HQ

INSPECTION PROCEDURE

1.

CHECK VDC OFF SWITCH

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC OFF switch connector M13.

3.

Check continuity between VDC OFF switch connector M13 ter-
minal 1 and 2.

OK or NG

OK

>> GO TO 2.

NG

>> Replace VDC OFF switch.

2.

CHECK VDC OFF SWITCH HARNESS

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC/TCS/ABS control unit connector E218.

3.

Check continuity between VDC OFF switch connector M13 and
VDC/TCS/ABS control unit connector E218.

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace malfunctioning components.

CAN Communication Circuit

NFS000DB

INSPECTION PROCEDURE

●

Check the following if “CAN COMM CIRCUIT” or “ST ANG SEN COM CIR” is detected in self-diagnostic
results of CONSULT-II.

VDC OFF switch con-

nector

Condition

Continuity

1 - 2

VDC OFF switch ON

Yes

VDC OFF switch OFF

No

SFIA2338E

VDC/TCS/ABS control

unit

VDC OFF switch

Continuity

44

2

Yes

Ground

No

Ground

1

Yes

PFIA0691E

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-55

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

1.

CHECK CONNECTOR

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC/TCS/ABS control unit connector and steering angle sensor connector. Check terminal for
deformation, disconnection, looseness, and so on. If any malfunction is found, repair or replace terminal.

3.

Securely reconnect connectors and perform self-diagnosis.

Is above displayed in the self-diagnosis display?

YES

>> Print out self-diagnostic results and go to

LAN-17, "Precautions When Using CONSULT-II"

.

NO

>> INSPECTION END

RAS Control Unit (With RAS)

NFS000HR

INSPECTION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

With CONSULT-II

1.

Turn ignition switch “ON”. (Do not start engine.)

2.

Select “SELF-DIAG RESULTS” mode for “VDC” with CONSULT-II.

3.

Touch “ERASE”.

4.

Turn ignition switch “OFF” and wait at least 10 seconds.

5.

Check the self-diagnostic 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-49, "SELF-DIAG RESULT MODE"

.

2.

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

OK or NG

OK

>> INSPECTION END

NG

>> Repair or replace malfunctioning components.

Inspecting Components

NFS000DC

VDC OFF SWITCH

●

Turn ignition switch is OFF and disconnect VDC OFF switch
connector. Check continuity between terminal 1 and 2.

Self-diagnostic results

CAN COMM CIRCUIT

ST ANG SEN COM CIR

Self-diagnosis results

RAS CIRCUIT

VDC OFF switch con-

nector

Condition

Continuity

1 - 2

VDC OFF switch ON

Yes

VDC OFF switch OFF

No

SFIA2338E

BRC-56

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

PARKING BRAKE SWITCH

●

Turn ignition switch OFF. Check continuity between parking
brake switch connector M8 and ground

VDC RELAY BOX

Turn ignition switch is OFF and disconnect VDC relay box connector.
Check continuity, resistance value, and insulation between any pair
of terminals in VDC relay box.

Continuity and Resistance

Parking brake

switch connector

Measurement condition

Continuity

1 - Ground

Depressing the parking brake pedal

Yes

Releasing the parking brake pedal

No

SFIA2460E

SFIA2376E

SFIA2424E