Infiniti F50. Manual - part 279

TROUBLE DIAGNOSIS

BRC-59

C

D

E

G

H

I

J

K

L

M

A

B

BRC

3. 

CHECKING SELF-DIAGNOSIS RESULTS (2)

1.

Connect VDC/TCS/ABS control unit and steering angle sensor connector.

2.

Connect battery negative terminal. Turn ignition switch ON.

3.

Erase self-diagnosis results. Then start engine and perform self-diagnosis.

Does only “STEERING ANGLE SENSOR COMMUNICATION SYSTEM” appear on self-diagnosis results dis-
play?

YES

>> Check spiral cable (Replace steering angle sensor and adjust steering angle sensor neutral posi-

tion. Refer to 

BRC-6, "Adjustment of Steering Angle Sensor Neutral Position"

 .)

NO

>> GO TO 4.

4. 

CAN COMMUNICATION SYSTEM CHECK

Check “CAN DIAGNOSIS SUPPORT MONITOR” of data monitor items.

>> Print out monitor items. Then refer to CAN system 

LAN-24, "CAN SYSTEM (FOR VDC MOD-

ELS)"

  or 

LAN-40, "CAN SYSTEM (FOR ICC MODELS)"

 .

Inspecting Components

EFS001ZS

VDC OFF SWITCH

●

Disconnect VDC OFF switch connector. Check continuity
between terminal No. 1 and terminal No. 2.

VDC RELAY BOX

Disconnect VDC relay box connector. Check continuity, resistance
value, and insulation between any pair of terminals in VDC relay box.

Normal

Error (example)

Models with ICC system

Models without ICC system

CAN COMM: OK

CAN COMM: OK

CAN COMM: OK

CAN CIRC1: OK

CAN CIRC1: OK

CAN CIRC 1: UNKWN

CAN CIRC 2: OK

CAN CIRC 2: OK

CAN CIRC 2: UNKWN

CAN CIRC3: OK

CAN CIRC3: OK

CAN CIRC 3: UNKWN

CAN CIRC 4: OK

CAN CIRC 4: OK

CAN CIRC 4: UNKWN

CAN CIRC 5: OK

CAN CIRC 5: UNKWN

CAN CIRC 5: UNKWN

CAN CIRC 6: OK

CAN CIRC 6: OK

CAN CIRC 6: UNKWN

No. 1 to No. 2:

Pressing switch will establish continuity, releasing 
it will break continuity.

SFIA0848E

SFIA0882E

BRC-60

TROUBLE DIAGNOSIS

Continuity, Resistance

VDC/TCS/ABS ACTUATOR

Disconnect actuator connectors. Check continuity and resistance value between any pair of terminals on the
actuator.

CAUTION:

Make sure actuator motor is correctly grounded.

SFIA0582E

SFIA0813E

TROUBLE DIAGNOSIS

BRC-61

C

D

E

G

H

I

J

K

L

M

A

B

BRC

Continuity, resistance

SFIA0814E

BRC-62

TROUBLE DIAGNOSIS

Actuator Operation Inspection

1.

Connect E56 and E57 terminals of actuator to 15 and 16 terminals of VDC relay box. 

2.

Measure motor voltage (No. 4 (R/B) terminal to body ground)
with oscilloscope. Then check motor reverse voltage occasioned
time. Motor reverse voltage occasioned time is more than 0.1
sec.

CAUTION:

●

The above check should be performed after motor relay
unit inspection to make sure relay operates normally.

●

Limit actuator drive motor operation to 4 seconds or less to
prevent heating.

●

Motor counter electromotive force duration is based on the
time at an ambient temperature of 20

°

C with 12V battery

voltage. If battery voltage or the ambient temperature is
lower, time will be slightly shorter.

Symptom 1 ABS Works Frequently.

EFS001ZT

Inspection Procedure

1. 

STARTING INSPECTION

Inspect wheel sensor system.

●

Sensor mounting inspection

●

Sensor pick-up inspection for iron chips

●

Sensor rotor inspection (e.g. Number of teeth, damaged teeth)

●

Sensor connector engagement inspection

OK or NG

OK

>> GO TO 2.

NG

>> Repair wheel sensor and rotor system.

2. 

CHECKING FOR LOOSENESS

Check for looseness of front and rear axle. Refer to front axle 

FAX-4, "WHEEL BEARING INSPECTION"

 , rear

axle 

RAX-5, "WHEEL BEARING INSPECTION"

 .

OK or NG

OK

>> GO TO 

BRC-62, "Symptom 2 Unexpected Pedal Reaction"

 .

NG

>> Axle inspection and repair

Symptom 2 Unexpected Pedal Reaction

EFS001ZU

Inspection Procedure

1. 

BRAKE PEDAL STROKE INSPECTION

Check brake pedal stroke.

Is stroke excessively long?

YES

>> Check bleeding and brake system.

NO

>> GO TO 2.

SFIA0883E