Infiniti F50. Manual - part 280

TROUBLE DIAGNOSIS

BRC-63

C

D

E

G

H

I

J

K

L

M

A

B

BRC

2. 

CHECKING PEDAL FORCE

Check that brake is effective with pedal depressed.

Is pedal heavy, but effective?

YES

>> Normal

NO

>> GO TO 3.

3. 

CONNECTOR AND PERFORMANCE INSPECTION

Disconnect actuator relay unit connector to deactivate ABS function. Check that brake is effective.

Is brake effective?

YES

>> GO TO 4.

NO

>> Brake line inspection

4. 

CHECKING ABS WARNING LAMP INDICATION

Check that ABS warning lamp illuminates.

OK or NG

OK

>> Execute self-diagnosis.

NG

>> GO TO 5.

5. 

CHECKING WHEEL SENSORS

Inspect wheel sensor system.

●

Sensor mounting inspection

●

Check sensor pick-up for adhering iron chips.

●

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

●

Sensor connector engagement inspection

OK or NG

OK

>> Normal

NG

>> Repair wheel sensor and rotor system.

Symptom 3 Long Stopping Distance

EFS001ZV

Inspection Procedure

1. 

STARTING INSPECTION

Check that stopping distance increases only on snowy roads and gravel roads.
OK or NG

OK

>> May be longer than for vehicles without ABS.

NG

>> GO TO 2.

2. 

CHECKING PERFORMANCE

Disconnect actuator VDC relay box to deactivate ABS function.

Is stopping distance still long?

YES

>>

●

Brake line air bleeding

●

Brake line inspection

NO

>> GO TO 3.

3. 

CHECKING ABS WARNING LAMP INDICATION

Check that ABS warning lamp illuminates.

OK or NG

OK

>> Perform self-diagnosis.

NG

>> GO TO 4.

BRC-64

TROUBLE DIAGNOSIS

4. 

CHECKING WHEEL SENSORS

Inspect wheel sensor system.

●

Sensor mounting inspection

●

Check sensor pick-up for adhering iron chips.

●

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

●

Sensor connector engagement inspection

OK or NG

OK

>> Normal

NG

>> Repair wheel sensor and rotor system.

Symptom 4 ABS Does Not Work.

EFS001ZW

Inspection Procedure

1. 

CHECKING ABS WARNING LAMP INDICATION

Check that ABS warning lamp illuminates.

OK or NG

OK

>> Perform self-diagnosis.

NG

>> GO TO 2.

2. 

CHECKING WHEEL SENSORS

Inspect wheel sensor system.

●

Sensor mounting inspection

●

Check sensor pick-up for adhering iron chips.

●

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

●

Sensor connector engagement inspection

OK or NG

OK

>> Normal

NG

>> Repair wheel sensor and rotor system.

Symptom 5 Pedal Vibration and Noise

EFS001ZX

Inspection Procedure

1. 

INSPECTION (1)

Check brake system for pedal vibration or noise at engine start.

OK or NG

OK

>> Perform self-diagnosis.

NG

>> GO TO 2.

2. 

INSPECTION (2)

Check for vibration during soft braking (just placing foot on pedal).

CAUTION:

ABS may activate in conditions such as those listed below, when wheel speed changes.

●

Gear shifting

●

Turning at high speed

●

Passing through gusts of wind

OK or NG

OK

>> GO TO 3.

NG

>> Normal

TROUBLE DIAGNOSIS

BRC-65

C

D

E

G

H

I

J

K

L

M

A

B

BRC

3. 

INSPECTION (3)

Does vibration occur during normal braking?

CAUTION:

In addition to activation for sudden braking, ABS may activate in conditions such as those listed
below.

●

Roads with low surface 

µ

●

Turning at high speed

●

Passing through gusts of wind

OK or NG

OK

>> GO TO 4.

NG

>> Normal

4. 

INSPECTION (4)

Check for vibration when engine speed is increased while vehicle is stopped.

OK or NG

OK

>> GO TO 5.

NG

>>

●

Normal.

CAUTION:

Vibration may occur when vehicle is stopped.

5. 

INSPECTION (5)

Check for vibration when switches of electrical components are operated.

OK or NG

OK

>> Check for any wireless devices, antennas, or antenna lead near control unit (including wiring).

NG

>> GO TO 6.

6. 

CHECKING ABS WARNING LAMP INDICATION

Confirm ABS warning lamp turns on.

OK or NG

OK

>> Execute self-diagnosis.

NG

>> GO TO 7.

7. 

CHECKING WHEEL SENSORS

Inspect wheel sensor system.

●

Sensor mounting inspection

●

Sensor pick-up inspection for iron chips (e.g. Number of teeth, damaged teeth)

●

Sensor connector engagement inspection

●

Inspection of wheel sensor circuit

OK or NG

OK

>> Normal

NG

>> Repair wheel sensor and rotor system.

BRC-66

TROUBLE DIAGNOSIS

Symptom 6 VDC OFF Indicator Lamp Does Not Illuminate.

EFS00287

Inspection Procedure

1. 

CHECKING VDC OFF INDICATOR LAMP POWER CIRCUIT

●

Disconnect VDC/TCS/ABS control unit connector.

●

Check that voltage between VDC/TCS/ABS control unit harness terminal and ground is battery voltage
(Approx. 12V).

OK or NG ?

OK

>> Malfunction of VDC/TCS/ABS control unit. Repair or replace control unit.

NG

>> Malfunction in combination meter system. Inspect combination meter system.

Symptom 7 SLIP Indicator Lamp Does Not Illuminate.

EFS001ZZ

Inspection Procedure

1. 

CHECKING FOR BURNED-OUT SLIP INDICATOR LAMP BULB

Check that there is continuity between meter power terminal and SLIP indicator lamp terminal.

OK or NG

OK

>> GO TO 2.

NG

>> Open or short in SLIP indicator lamp or combination meter circuit

2. 

CHECKING SLIP INDICATOR LAMP POWER CIRCUIT

Disconnect meter connector. Check that voltage between meter harness terminal and body ground is battery
voltage (Approx. 12V).

OK or NG

OK

>> GO TO 3.

NG

>>

●

Fuse inspection

●

Check harness and connectors between fuse block and meter.

●

Inspect power system (battery, ignition switch circuit).

3. 

CHECKING SLIP INDICATOR LAMP HARNESS

1.

Disconnect VDC/TCS/ABS control unit and meter vehicle-side harness connectors.

2.

Check for open circuit or short circuits in harness between meter and VDC/TCS/ABS control unit.

OK or NG

OK

>> GO TO 4.

NG

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

4. 

CHECKING SLIP INDICATOR LAMP CONNECTOR

Check VDC/TCS/ABS control unit and meter harness connectors.

OK or NG

OK

>> Reconnect connectors and perform self-diagnosis. There is an intermediate connector in vehicle

harness. Be sure to refer to vehicle wiring diagram when performing inspection.

NG

>> Connector open, shorted or damaged. Repair or replace connector.