Infiniti Q45. Manual - part 270

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-45

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

3. 

CHECK SOLENOID AND VDC SWITCHING VALVE CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC actuator connector E21,E22 and VDC/TCS/ABS control unit connector.

3.

Check continuity between VDC/TCS/ABS control unit harness
connector E218 and VDC actuator harness connector E21,E22.

OK or NG

OK

>> GO TO 4.

NG

>> Open or short in harness between VDC/TCS/ABS control unit and VDC actuator

4. 

CHECK SOLENOID AND VDC SWITCHING VALVE INPUT SIGNAL

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC actuator connector.

3.

Check resistance of VDC actuator solenoid.

OK or NG

OK

>> Perform VDC/TCS/ABS control unit self-diagnosis

again.

NO

>> Replace VDC actuator assembly.

Item

VDC/TCS/

ABS control 

unit

VDC actua-

tor

Continuity

FR LH IN ABS SOL

5

1

Continuity should 
exist.

FR LH OUT ABS 
SOL

3

14

RR RH IN ABS SOL

6

7

RR RH OUT ABS 
SOL

4

17

FR RH IN ABS SOL

26

3

FR RH OUT ABS 
SOL

55

15

RR LH IN ABS SOL

53

5

RR LH OUT ABS 
SOL

25

16

PRIMARY SIDE 
USV CIRCUIT

49

26

SECONDARY SIDE 
USV CIRCUIT

50

25

PRIMARY SIDE 
HSV CIRCUIT

54

28

SECONDARY SIDE 
HSV CIRCUIT

52

27

SFIA2365E

VDC actuator connec-

tor

VDC actuator connec-

tor

Resistance value

1, 3, 5, 7, 25, 26

19

6.0 - 11

Ω

14, 15, 16, 17, 27, 28

3.0 - 5.0

Ω

SFIA2317E

BRC-46

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

Actuator Motor and Motor Relay

NFS000D5

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 VDC/TCS/ABS control unit connector E218, VDC actuator connector and VDC relay box con-
nector E55, E56, E57,check terminal for deformation, disconnection, looseness, and so on. If any mal-
function is found, repair or replace terminal. 

3.

Reconnect connectors and then perform the self-diagnosis.

OK or NG

OK

>> INSPECTION END.

NG

>> GO TO 3.

3. 

CHECK ABS MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC relay box connector E57.

3.

Check voltage between VDC relay box harness connector E57
and body ground.

OK or NG

OK

>> GO TO 4.

NG

>>

●

Check fuse 50 A.

●

Check that there is continuity between battery and
VDC relay box terminal No. 10.

Self-diagnosis results

PUMP MOTOR ACTUATOR RLY

10 - Ground

: Battery voltage.

SFIA2366E

TROUBLE DIAGNOSIS FOR SYSTEM

BRC-47

[VDC/TCS/ABS]

C

D

E

G

H

I

J

K

L

M

A

B

BRC

4. 

CHECK MOTOR RELAY CIRCUIT

1.

Turn ignition switch “OFF”. 

2.

Disconnect VDC/TCS/ABS control unit connector E218, VDC actuator connector E23 and VDC relay box
connector E55 and E56.

3.

Check continuity between VDC/TCS/ABS control unit harness
connector E218 and VDC relay box harness connector E56.

4.

Check continuity between VDC relay box harness connector
E55 and VDC actuator harness connector E23.

OK or NG

OK

>> GO TO 5.

NG

>> Check harness for open or short between VDC relay

box and VDC/TCS/ABS control unit or VDC actuator. 

5. 

CHECK ABS MOTOR CIRCUIT

1.

Check actuator motor by listening for its operation sound while
applying battery voltage to the VDC actuator terminal 21.

CAUTION:

To prevent overheating, do not operate actuator motor
more than 4 seconds.

OK or NG

OK

>> GO TO 6.

NG

>> Check body ground condition of VDC actuator. If condi-

tion is OK, replace VDC actuator. 

6. 

CHECK MOTOR RELAY UNIT

Check motor relay as a unit. Refer to 

BRC-56, "VDC RELAY BOX"

 .

OK or NG

OK

>> Check VDC/TCS/ABS control unit power circuit.

NG

>> Replace motor relay.

20 - 4

: Continuity should exist.

7 - 8

: Continuity should exist.

SFIA2493E

15 - 21

: Continuity should exist.

SFIA2429E

SFIA2430E

BRC-48

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS FOR SYSTEM

Actuator Relay

NFS000D6

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 VDC/TCS/ABS control unit connector E218 and VDC relay box connector E57. Then recon-
nect it securely.

3.

Perform VDC/TCS/ABS control unit self-diagnosis again.

Do any self-diagnosis items appear?

YES

>> GO TO 3.

NO

>> Poor connection. Repair or replace applicable connector.

3. 

CHECK ACTUATOR RELAY POWER SYSTEM

1.

Turn ignition switch “OFF”.

2.

Disconnect VDC relay box connector E57.

3.

Check voltage between VDC relay box harness connector E57
and ground.

OK or NG

OK

>> GO TO 4.

NG

>>

●

Check fuse 30A.

●

Check continuity between battery and VDC relay box
harness connector E57 terminal 9. If it is not OK,
replace fuse or harness.

Self-diagnosis results

MAIN  RELAY

9 - Ground

: Battery voltage

SFIA2369E