Infiniti M45 (Y34). Manual - part 277

TROUBLE DIAGNOSIS

BRC-51

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

4. 

SOLENOID VALVE RELAY HARNESS INSPECTION

1.

Disconnect the VDC/TCS/ABS control unit connector and the
VDC relay box harness connector and the steering angle sensor
connector.

2.

Check the continuity between the VDC/TCS/ABS control unit
connector and the VDC relay box harness connector.

OK or NG

OK

>> GO TO 5.

NG

>> Open or short in harness. Repair or replace the harness.

5. 

SOLENOID VALVE RELAY INSPECTION

Independently check the VDC actuator relay. Refer to 

BRC-56, "VDC RELAY BOX"

 .

OK or NG

OK

>> Replace VDC actuator assembly.

NG

>> Replace the VDC relay box.

Inspection 10 Stop Lamp Switch System

AFS001KE

INSPECTION PROCEDURE

1. 

SELF-DIAGNOSIS RESULT CHECK

Check self-diagnosis results.

Is the above displayed in the self-diagnosis display items?

YES

>> GO TO 2.

NO

>> Inspection End

2. 

CONNECTOR INSPECTION

1.

Disconnect the stop lamp switch connector and VDC/TCS/ABS control unit connector and check the ter-
minals for deformation, disconnection, looseness, and so on. If there is an error, repair or replace the ter-
minal.

2.

Securely reconnect the connectors.

3.

Start engine.

4.

Repeat pumping brake pedal carefully several times, then perform self-diagnosis again.

OK or NG

OK

>> The connector terminal contact is loose, damaged, open or shorted.

NG

>> GO TO 3.

SFIA1935E

VDC/TCS/ABS control unit

(Harness connector E218)

VDC relay box

(Harness connector E56)

Continuity

2 (SB)

5 (SB)

Continuity should exist.

36 (GY/R)

7 (GY/R)

Continuity should exist.

Self-diagnosis results

STOP LAMP SW

BRC-52

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

3. 

STOP LAMP SWITCH INSPECTION

1.

Turn ignition switch OFF and disconnect the VDC/TCS/ABS
control unit connector.

2.

Check the voltage between the VDC/TCS/ABS control unit har-
ness connector terminal 48 (R/W) and the ground.

OK or NG

OK

>> Connect the connectors and conduct a VDC/TCS/ABS

control unit self-diagnosis.

NG

>> Open or short in harness. Repair or replace the harness.

Inspection 11 VDC/TCS/ABS Control Unit Power and Ground Systems

AFS001KF

INSPECTION PROCEDURE

1. 

SELF-DIAGNOSIS RESULT CHECK

Check self-diagnosis results.

Is the above displayed in the self-diagnosis item?

YES

>> GO TO 2.

NO

>> Inspection End

2. 

CONNECTOR INSPECTION

1.

Disconnect the VDC/TCS/ABS control unit connector and check the terminal for deformation, disconnec-
tion, looseness, and so on. If there is an error, repair or replace the terminal.

2.

Securely reconnect the connector and Re-conduct self-diagnosis.

OK or NG

OK

>> The connector terminal contact is loose, damaged, open or shorted.

NG

>> GO TO 3.

48 (R/W) - Ground

Brake pedal depressed:

Battery voltage (approx. 12V)

Brake pedal not depressed

: Approx. 0V

SFIA1936E

Self-diagnosis results

LOW POWER VOLTAGE

TROUBLE DIAGNOSIS

BRC-53

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

3. 

VDC/TCS/ABS CONTROL UNIT POWER AND GROUND CIRCUIT INSPECTION

1.

Disconnect the VDC/TCS/ABS control unit connector.

2.

With the ignition switch turned on and off, check the voltage and
continuity between the VDC/TCS/ABS control unit harness con-
nector and the ground.

OK or NG

OK

>> Check the battery (terminal looseness, low voltage, etc.) For any non-standard condition. If any

non-standard condition exists, recharge or replace the battery as necessary.

NG

>> The corresponding harness circuit is open or shorted. Repair the circuit.

SFIA1937E

Signal name

VDC/TCS/ABS control unit

(Harness connector E218)

Ground

Measured value

Power supply

1 (GY)

—

Battery voltage (Approx. 12V)

SFIA1938E

Signal name

VDC/TCS/ABS control unit

(Harness connector E218)

Ground

Measured value

Ground

27 (B)

—

Continuity should exist.

28 (B)

—

Continuity should exist.

29 (B)

—

Continuity should exist.

33 (B)

—

Continuity should exist.

BRC-54

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Inspection 12 VDC/TCS/ABS Control Unit 2

AFS001KG

INSPECTION PROCEDURE

1. 

SELF-DIAGNOSIS RESULT CHECK

Check self-diagnosis results.

When any item other than “emergency brake” is indicated in self-diagnosis display, follow the instructions
below.

CAUTION:

“Emergency brake” is indicated when control unit itself is detected as an error. If this display item is
indicated, replace control unit.

Is the above displayed in the self-diagnosis display items?

YES

>> Replace the VDC/TCS/ABS control unit and re-conduct the self-diagnosis.

NO

>> Inspection End

Inspection 13 Brake Fluid Level Sensor System

AFS001KH

INSPECTION PROCEDURE

1. 

SELF-DIAGNOSIS RESULT CHECK

1.

Check the brake reservoir tank fluid level. If the level is low, add brake fluid.

2.

Erase the self-diagnosis results and check the self-diagnosis results.

Is the above displayed in the self-diagnosis display items?

YES

>> GO TO 2.

NO

>> Inspection End

2. 

CONNECTOR INSPECTION

1.

Disconnect the brake fluid level sensor connector and VDC/TCS/ABS control unit connector and check
the terminal for deformation, disconnection, looseness, and so on. If there is any non-standard condition,
repair or replace the terminal.

2.

Securely reconnect the connectors and Re-conduct self-diagnosis.

OK or NG

OK

>> The connector terminal contact is loose, damaged, open or shorted.

NG

>> GO TO 3.

Self-diagnosis results

EMERGENCY BRAKE

Self-diagnosis results

BRAKE FLUID LEVEL LOW