Infiniti M45 (Y34). Manual — part 279
TROUBLE DIAGNOSIS
BRC-59
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
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
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
.
NG
>> Perform self-diagnosis. Refer to
TROUBLE DIAGNOSIS
BRC-61
[VDC/TCS/ABS]
C
D
E
G
H
I
J
K
L
M
A
B
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
.
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
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
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
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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