Infiniti F50. Manual - part 274

TROUBLE DIAGNOSIS

BRC-39

C

D

E

G

H

I

J

K

L

M

A

B

BRC

Basic Inspection

EFS001ZB

BASIC INSPECTION 1: BRAKE FLUID LEVEL AND LEAK INSPECTION

1.

Check fluid level in brake reservoir tank. If fluid level is low, refill brake fluid.

2.

Check for leakage in brake piping and around VDC actuator. If leakage or seepage is found, check as fol-
lows.

●

If VDC actuator connector is loose, tighten piping to specified torque. Then inspect again and confirm
that there is no leakage.

●

 If connection flare nuts or screws of VDC actuator are damaged, replace damaged parts. Then inspect
again and confirm that there is no leakage.

●

If there is leakage or seepage at any location other than VDC actuator connections, wipe away leakage
or seepage with clean cloth. Then inspect again and confirm that there is no leakage.

●

If there is leakage from VDC actuator, wipe away leakage or seepage with clean cloth. Then inspect
again. If there is leakage or seepage, replace VDC actuator unit.

CAUTION:

ABS actuator body cannot be disassembled.

3.

Check brake disc rotor and pads.

BASIC INSPECTION 2: INSPECTION FOR LOOSENESS OF POWER SYSTEM TERMINALS

Check battery for looseness on battery positive/negative terminals and ground connection. If looseness is
detected, tighten piping to the specified torque. Check that battery voltage does not drop and alternator is nor-
mal.

BASIC INSPECTION 3: INSPECTION OF ABS WARNING LAMP, VDC OFF INDICATOR LAMP, 
AND SLIP INDICATOR LAMP

1.

Check that ABS warning lamp illuminates for approximately 1 seconds when ignition switch is turned ON.
If it does not illuminate, inspect ABS warning lamp and circuit, and inspect combination meter.

2.

Check that VDC OFF indicator lamp illuminates for approximately 1 seconds when ignition switch is
turned ON. If it does not illuminate, inspect VDC OFF indicator lamp and circuit, and inspect combination
meter.

3.

Check that SLIP indicator lamp illuminates for approximately 1 seconds when ignition switch is turned ON.
If it does not turn on, check SLIP indicator lamp and circuit.

4.

With engine running, turn VDC OFF switch ON and OFF. Check that VDC OFF indicator lamp turns ON
and OFF. If indicator lamp does not turn ON and OFF according to switch operation, inspect VDC OFF
switch and circuit.

5.

With VDC OFF switch OFF (not operating), check that VDC OFF indicator lamp turns OFF 2 seconds
after engine starts. If VDC OFF indicator lamp does not turn OFF after 10 seconds have passed since
engine-start, perform self-diagnosis of VDC/TCS/ABS control unit.

BRC-40

TROUBLE DIAGNOSIS

Inspection 1 Wheel Sensor System

EFS001ZC

INSPECTION PROCEDURE

First use CONSULT-II self-diagnosis results to determine positions of malfunctioning wheel sensors. Then
inspect parts and determine which parts to replace.

1. 

STARTING INSPECTION

Perform self-diagnosis.

OK or NG

OK

>> Inspection is completed.

NG

>> GO TO 2.

2. 

CHECKING CONNECTOR

Disconnect VDC/TCS/ABS control unit connector E218 and connector E70 (FR-LH), E20 (FR-RH), B35 (RR-
RH, LH) of wheel sensor where malfunction was detected. Check for deformation of terminals and incomplete
joining of connectors. Then reconnect connector. Also check that interference with other parts has not cut
wheel sensor cables.

Drive vehicle at 30 km/h(19MPH) or above for at least 1.0minute. Did ABS warning lamp turn OFF?

YES

>> Inspection is completed.

NO

>> GO TO 3.

SFIA0625E

TROUBLE DIAGNOSIS

BRC-41

C

D

E

G

H

I

J

K

L

M

A

B

BRC

3. 

CHECKING WHEEL SENSOR CIRCUIT

1.

Disconnect VDC/TCS/ABS control unit connector E218 and
wheel sensor connector E70 (FR-LH), E20 (FR-RH), B35 (RR-
RH, LH)

2.

Check resistance between terminals. (Check resistance when steering wheel is turned right and left, and
when sensor harness inside wheel house is moved.)

OK or NG

OK

>> GO TO 4.

NG

>> Repair harness and connectors between VDC/TCS/ABS control unit and wheel sensor. 

4. 

TIRE INSPECTION

Check air pressure, wear, and size.

Are air pressure, wear, and size within standards?

YES

>> GO TO 5.

NO

>> Adjust air pressure or replace tire.

5. 

SENSOR ROTOR INSPECTION

Check for damage to sensor rotor teeth and surface of rubber.

OK or NG

OK

>> GO TO 6.

NG

>> Replace sensor rotor.

6. 

POWER SUPPLY CHECK FOR CONTROL UNIT SENSOR

1.

Connect VDC/TCS/ABS control unit connector E218.

2.

Check voltage between wheel sensor harness connector E70 terminal 1 (B/W), E20 terminal 1 (W), B35
terminal 1 (L/G), 3 (W) and body ground.

OK or NG

OK

>> Replace wheel sensor.

NG

>> Replace VDC/TCS/ABS control unit.

SFIA0805E

Power system

Signal system

Wheel

Control unit

Wheel sensor

Control unit

Wheel sensor

Front RH wheel

15 (W)

1 (W)

16 (B)

2 (B)

Front LH wheel

8 (B/W)

1 (B/W)

10 (L)

2 (L)

Rear RH wheel

11 (L/G)

1 (L/G)

12 (L/Y)

2 (L/R)

Rear LH wheel

13 (W/L)

3 (W)

14 (OR/L)

4 (OR)

Resistance value

Power system

: 0 - 0.5 

Ω

Signal system

: 0 - 0.5 

Ω

Voltage

: Approx. 8V or more

BRC-42

TROUBLE DIAGNOSIS

Inspection 2 Engine System

EFS001ZD

Inspection Procedure

1. 

CHECKING SELF-DIAGNOSIS RESULTS (1)

Check self-diagnosis results.

Do self-diagnosis results indicate anything other than the above?

YES

>> Perform repair or replacement for the item indicated.

NO

>> GO TO 2.

2. 

CHECKING SELF-DIAGNOSIS RESULTS (2)

1.

Perform ECM self-diagnosis. Repair or replace items indicated, then perform ECM self-diagnosis again.

2.

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

OK or NG

OK

>> Inspection is completed.

NG

>> Repair or replace items indicated. Then perform self-diagnosis again.

Inspection 3 VDC/TCS/ABS Control Unit System

EFS001ZE

Inspection Procedure

1. 

CHECKING SELF-DIAGNOSIS RESULTS

Check self-diagnosis results.

Does anything other than “ABS CONTROLLER” appear on self-diagnosis display?

YES

>> Repair or replace items indicated. Then perform self-diagnosis again.

NO

>> Replace VDC/TCS/ABS control unit. Then perform VDC/TCS/ABS control unit self-diagnosis

again.

Self-diagnosis results

CONSULT-II display items

Engine system 2

Engine system 3

Engine system 4

Engine system 5

Engine system 6

Self-diagnosis results

CONSULT-II display items

ABS controller