Infiniti M45 (Y34). Manual - part 274

TROUBLE DIAGNOSIS

BRC-39

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

5. 

WHEEL SENSOR HARNESS INSPECTION

1.

Turn ignition switch OFF and disconnect the wheel sensor con-
nector E70 (FR - LH), E20 (FR - RH), B35 (RR - RH, LH) and
VDC/TCS/ABS control unit connector.

2.

Check the continuity between terminals. (Also check the conti-
nuity when the steering wheel is turned right and left and when
the sensor harness inside the wheel well is moved.)

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness and connector between control unit and wheel sensor.

6. 

WHEEL SENSOR POWER CIRCUIT INSPECTION

1.

Connect the wheel sensor connector E70 (FR - LH), E20 (FR -
RH), B35 (RR - RH, LH) and VDC/TCS/ABS control unit connec-
tor.

2.

Turn ignition switch ON and check the voltage between the
power terminal and the ground.

OK or NG

OK

>> Replace wheel sensor.

NG

>> Replace the VDC/TCS/ABS control unit.

SFIA1926E

Power system

Signal system

Ground system

Wheel

VDC/TCS/ABS 

control unit

(Harness con-

nector E218)

Wheel sensor

(Harness con-

nector)

VDC/TCS/ABS 

control unit

(Harness con-

nector E218)

Wheel sensor

(Harness con-

nector)

  VDC/TCS/ABS 

control unit 

(signal)

(Harness connector 

E218)

  VDC/TCS/ABS 

control unit

(ground)

 (Harness con-

nector E218)

Front RH

15 (W)

1 (W)

16 (B)

2 (B)

15 (W),16 (B)

27 (B), 28 (B), 

29 (B), 33 (B)

Front LH

8 (PU)

1 (PU)

10 (G)

2 G)

8 (PU), 10 (G)

Rear RH 

11 (OR)

1 (OR)

12 (B/P)

2 (B/P)

11 (OR), 12 (B/P)

Rear LH 

13 (LG)

3 (LG)

14 (B/Y)

4 (B/Y)

13 (LG), 14 (B/Y)

Power system

: Continuity should exist.

Signal system

: Continuity should exist.

Ground system

: Continuity should not exist.

Voltage

Front RH

1 (W) - Ground

: 8V or more

Front LH

1 (PU) - Ground

: 8V or more

Rear RH 

1 (OR) - Ground

: 8V or more

Rear LH 

3 (LG) - Ground

: 8V or more

SFIA1927E

BRC-40

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Inspection 2 Engine System

AFS001K6

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. 

ENGINE SYSTEM INSPECTION

1.

Conduct an ECM self-diagnosis and repair or replace any non-standard items. Re-conduct the ECM self-
diagnosis.

2.

Re-conduct the VDC/TCS/ABS control unit self-diagnosis.

OK or NG

OK

>> Inspection End

NG

>> Repair or replace any non-standard items. Re-conduct the self-diagnosis.

Inspection 3 VDC/TCS/ABS Control Unit 1

AFS001K7

INSPECTION PROCEDURE

1. 

SELF-DIAGNOSIS RESULT CHECK

Check self-diagnosis results.

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

YES

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

NO

>> Inspection End

Inspection 4 Pressure Sensor System

AFS001K8

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

Self-diagnosis results

ENGINE SIGNAL 1

ENGINE SIGNAL 2

ENGINE SIGNAL 3

ENGINE SIGNAL 4

ENGINE SIGNAL 5

ENGINE SIGNAL 6

Self-diagnosis results

ABS CONTROLLER

Self-diagnosis results

PRESS SEN SYSTEM

TROUBLE DIAGNOSIS

BRC-41

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

2. 

CONNECTOR INSPECTION

1.

Disconnect VDC actuator (pressure sensor) connector and VDC/TCS/ABS control unit connector, check
the terminals for deformation, disconnection, looseness, and so on. If there is an error, repair or replace
the terminal.

2.

Reconnect the connectors and Re-conduct VDC/TCS/ABS control unit self-diagnosis.

OK or NG

OK

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

NG

>> GO TO 3.

3. 

PRESSURE SENSOR HARNESS INSPECTION

1.

Turn ignition switch OFF and disconnect VDC actuator (pres-
sure sensor) connector and VDC/TCS/ABS control unit connec-
tor.

2.

Check the continuity between VDC/TCS/ABS control unit har-
ness connector and VDC actuator (pressure sensor) harness
connector.

OK or NG

OK

>> GO TO 4.

NG

>> If the open or short in harness, repair or replace the harness.

4. 

PRESSURE SENSOR INSPECTION

1.

Connect pressure sensor and VDC/TCS/ABS control unit connectors.

2.

Use “Data Monitor” to check the pressure sensor value.

OK or NG

OK

>> Inspection End

NG

>> If the pressure sensor is damaged or malfunctioning, replace the VDC actuator (pressure sensor it

built in).

SFIA1928E

VDC/TCS/ABS control unit

(Harness connector E218)

VDC actuator (pressure sensor)

(Harness connector E21)

Continuity

69 (P/L)

30 (P/L)

Continuity should exist.

68 (LG)

31 (LG)

Continuity should exist.

67 (G/OR)

32 (G/OR)

Continuity should exist.

Condition

Data monitor display

When brake pedal is depressed.

Positive value

When brake pedal is released.

Approx. 0 bar

BRC-42

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

Inspection 5 Steering Angle Sensor System

AFS001K9

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 steering angle sensor connector and VDC/TCS/ABS control unit connector and check the
terminals for deformation, disconnection, looseness, and so on. If there is an error, repair or replace the
terminal.

2.

Reconnect the connectors and Re-conduct a VDC/TCS/ABS control unit self-diagnosis.

OK or NG

OK

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

NG

>> GO TO 3.

3. 

STEERING ANGLE SENSOR HARNESS INSPECTION

1.

Check the CAN communication system. Refer to 

BRC-55, "Inspection 14 CAN Communication System"

 .

2.

Turn ignition switch OFF and disconnect the steering angle sen-
sor connector and VDC/TCS/ABS control unit connector.

3.

Check the continuity between VDC/TCS/ABS control unit har-
ness connector terminal 2 (SB) and steering angle sensor har-
ness connector terminal 3 (SB).

OK or NG

OK

>> GO TO 4.

NG

>> If the open or short in harness, repair or replace the harness.

Self-diagnosis results

Steering angle sensor system

SFIA1929E

VDC/TCS/ABS control unit

(Harness connector E218)

Steering angle sensor

(Harness connector M52)

Continuity

2 (SB)

3 (SB)

Continuity should exist.