Infiniti M45 (Y34). Manual - part 279

 

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Infiniti M45 (Y34). Manual - part 279

 

 

TROUBLE DIAGNOSIS

BRC-59

[VDC/TCS/ABS]

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BRC

Actuator Operation Inspection

1.

Connect E55 and E57 connectors of VDC relay box. 

2.

Measure the motor voltage [No. 4 (R/B) terminal to  ground] with
oscilloscope. Then check the motor reverse voltage occasioned
time. The 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 the battery voltage or the ambient temperature is
lower, the time will be slightly shorter.

Symptom 1 Excessive ABS Function Operation Frequency

AFS001KK

1. 

INSPECTION START

Check brake force distribution.

OK or NG

OK

>> GO TO 2.

NG

>> Check brake system

2. 

FRONT AND REAR AXLE INSPECTION

Make sure there is no excessive play in the front and rear axles.

OK or NG

OK

>> GO TO 3.

NG

>> Repair.

3. 

WHEEL SENSOR INSPECTION

Wheel Sensor Inspection

Sensor mount and damage inspection

Sensor rotor mount and damage inspection

Sensor connector connection inspection

Sensor harness inspection

OK or NG

OK

>> GO TO 4.

NG

>> Sensor or sensor rotor replacement

SFIA2216E

BRC-60

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

4. 

ABS WARNING LAMP DISPLAY CHECK

Make sure the warning lamp turns off approximately 1 sec. After the ignition switch is turned on or when driv-
ing.

OK or NG

OK

>> Normal

NG

>> Perform self-diagnosis. Refer to 

BRC-27, "SELF-DIAGNOSIS"

 .

Symptom 2 Unexpected Pedal Reaction

AFS001KL

1. 

BRAKE PEDAL STROKE INSPECTION

Check brake pedal stroke.
Is the stroke too big?

YES

>>

Bleed air from the brake piping.

Check the brake pedal, brake booster, and master cylinder mount for play, looseness, and
brake system for fluid leaks, etc. If any malfunctions are found, make repair.

NO

>> GO TO 2.

2. 

PERFORMANCE CHECK

Disconnect the VDC relay box connector and make sure the braking force is sufficient when the ABS in not
operating. After the inspection, reconnect the connector. 

OK or NG

OK

>> GO TO 3. Refer to 

BRC-59, "Symptom 1 Excessive ABS Function Operation Frequency"

 .

NG

>> Check brake system.

Symptom 3 The Braking Distance Is Long

AFS001KM

CAUTION:

On slippery road surfaces, the stopping distance might be longer with the ABS operating than when
the ABS is not operating.

1. 

PERFORMANCE CHECK

Disconnect VDC relay box connector to deactivate ABS. In this condition, check stopping distance. After
inspection, connect connector.

OK or NG

OK

>>

Bleed air from the brake piping.

Check brake system.

NG

>> GO TO 3. Refer to 

BRC-59, "Symptom 1 Excessive ABS Function Operation Frequency"

 .

Symptom 4 The ABS Function Does Not Operate

AFS001KN

CAUTION:

The ABS does not operate when the speed is 10 km/h (6 MPH) or less.

1. 

ABS WARNING LAMP DISPLAY CHECK

Make sure the warning lamp turns off approximately 1 second after the ignition switch is turned on or when
driving.

OK or NG

OK

>> GO TO 3. Wheel Sensor Inspection in 

BRC-59, "Symptom 1 Excessive ABS Function Operation

Frequency"

 .

NG

>> Perform self-diagnosis. Refer to 

BRC-27, "SELF-DIAGNOSIS"

 . 

TROUBLE DIAGNOSIS

BRC-61

[VDC/TCS/ABS]

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BRC

Symptom 5 Pedal Vibration or ABS Operation Sound Occurs

AFS001KO

CAUTION:

Under the following conditions, when brake pedal is lightly depressed (just place a foot on it), ABS is
activated and vibration is felt. However, this is normal.

When shifting gears

When driving on slippery road

During cornering at high speed

When passing over bumps or grooves [50 mm (1.97 in) or more]

When pulling away just after starting engine (at approximately 10 km/h (6MPH) or higher)

1. 

SYMPTOM CHECK 1

Check if pedal vibration or operation sound occurs when the engine is started.

OK or NG

OK

>> GO TO 2.

NG

>> Perform self-diagnosis. Refer to 

BRC-27, "SELF-DIAGNOSIS"

 .

2. 

SYMPTOM CHECK 2

Check the symptom when electrical component (headlamps, etc.) Switches are operated.

Does the symptom occur when the electrical component (head lamp, etc.) Switches are operated?

YES

>> Check if there is a radio, antenna, antenna lead wire, or wiring close to the control unit (or its wir-

ing), and if there is, move it farther away.

NO

>> GO TO 3. Wheel Sensor Inspection in 

BRC-59, "Symptom 1 Excessive ABS Function Operation

Frequency"

 .

Symptom 6 Vehicle Jerks During VDC/TCS/ABS Control

AFS001KP

1. 

ENGINE SPEED SIGNAL INSPECTION

Conduct CONSULT-II VDC/TCS/ABS control unit “Data Monitor”.

Is engine speed at idle 400 rpm or higher?

YES

>> GO TO 3.

NO

>> GO TO 2.

2. 

ECM SELF-DIAGNOSIS RESULT ITEM CHECK

Perform ECM self-diagnosis.

Are self-diagnosis items displayed?

YES

>> Check the corresponding items. Refer to 

EC-73, "TROUBLE DIAGNOSIS"

  in “Engine Control

(EC section)”.

NO

>> GO TO 3.

3. 

SYMPTOM CHECK 1

Check if the vehicle jerks during VDC/TCS/ABS control.

OK or NG

OK

>> Inspection End

NG

>> GO TO 4.

4. 

A/T SELF-DIAGNOSIS RESULTS ITEM CHECK

Perform A/T self-diagnosis.

OK or NG

OK

>> GO TO 5.

NG

>> Check the corresponding items. Refer to 

AT-43, "TROUBLE DIAGNOSIS"

  in “A/T”.

BRC-62

[VDC/TCS/ABS]

TROUBLE DIAGNOSIS

5. 

SYMPTOM CHECK 2

Check if the vehicle jerks during VDC/TCS/ABS control.

OK or NG

OK

>> Inspection End

NG

>> GO TO 6.

6. 

SELF-DIAGNOSIS RESULT ITEM INSPECTION 1

Conduct self-diagnosis of the VDC/TCS/ABS control unit.

Are self-diagnosis items displayed?

YES

>> Check the corresponding items, make repairs, and re-conduct the VDC/TCS/ABS control unit self-

diagnosis.

NO

>> GO TO 7.

7. 

CONNECTOR INSPECTION

1.

Disconnect the VDC/TCS/ABS control unit and the ECM connectors, check the terminals for deformation,
disconnection, looseness, and so on. If there is an error, repair or replace the connector.

2.

Securely reconnect the connector and conduct self-diagnosis.

OK or NG

OK

>> If the connector terminal contact is loose, damaged, open or shorted, repair or replace the con-

nector terminal.

NG

>> GO TO 8.

8. 

SELF-DIAGNOSIS RESULT ITEM INSPECTION 2

Re-conduct the VDC/TCS/ABS control unit self-diagnosis.
Are self-diagnosis items displayed?

YES

>> Repair or replace any non-standard items.

NO

>> GO TO 9.

9. 

INSPECTION OF CIRCUIT BETWEEN VDC/TCS/ABS CONTROL UNIT AND THE ECM

Check the CAN communication system. Refer to 

BRC-55, "Inspection 14 CAN Communication System"

 .

OK or NG

OK

>> Inspection End

NG

>> Connect the connectors, and re-conduct the VDC/TCS/ABS control unit self-diagnosis.

 

 

 

 

 

 

 

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