Abs INFINITI QX56 2009 Factory Manual Online

C1185 ICC UNITBRC-79
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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1. Measure the continuity between ABS actuator and electric unit
(control unit) connector E125 and ICC unit connector B13.
2. Measure the continuity between ABS actuator and electric unit
(control unit) connector E125 and body ground.
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Repair or replace harness or connector.
Special Repair RequirementINFOID:0000000003772598
1.ADJUSTMENT OF STEERING AN GLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
ABS actuator and electric unit (control unit) ICC unit
Continuity
Connector Terminal Connector Terminal
A: E125 7B: B13 10Yes
ABS actuator and electric unit (control unit) —Con tin uit y
Connector Terminal
A: E125 7Ground No
AWFIA0067ZZ
Revision: December 20092009 QX56

BRC-80
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
U1000 CAN COMM CIRCUIT
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000003772599
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication s
peed and excellent error detection ability. Many elec-
tronic control units are equipped onto a vehicle, and each control unit shares information and links with other
control units during operation (not independent). In CA N communication, control units are connected with 2
communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
DTC LogicINFOID:0000000003772600
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000003772601
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn ignition switch OFF, disconnect the ABS actuat or and electric unit (control unit) connector, and check
the terminals for deformation, disconnection, looseness, and so on. If there is a malfunction, repair or
replace the terminal.
2. Reconnect connector and perform self-diagnosis.
Is
“CAN COMM CIRCUIT” displayed in self-diagnosis display items?
YES >> Print out the self-diagnostic results, and refer to LAN-14, "Trouble Diagnosis Flow Chart".
NO >> Connector terminal is loose, damaged, open, or shorted.
Special Repair RequirementINFOID:0000000003772602
1.ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION
Always perform neutral position adjustment for the st eering angle sensor when replacing the ABS actuator
and electric unit (control unit). Refer to BRC-8, "
ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL
POSITION : Description".
>> GO TO 2
2.CALIBRATION OF DECEL G SENSOR
Always perform calibration of decel G sensor when replac ing the ABS actuator and electric unit (control unit).
Refer to BRC-9, "
CALIBRATION OF DECEL G SENSOR : Description".
>> END
DTC Display item Malfunction detected condition Possible cause
U1000 CAN COMM CIRCUIT When ABS actuator and electric unit (control unit) is not
transmitting or receiving CAN communication signal for 2
seconds or more. • CAN communication line
• ABS actuator and electric unit
(control unit)
Revision: December 20092009 QX56

VDC OFF SWITCHBRC-81
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF SWITCH
DescriptionINFOID:0000000003772603
VDC OFF switch can deactivate (t urn OFF) the VDC/TCS function by pressing the VDC OFF switch.
Component Function CheckINFOID:0000000003772604
1.CHECK VDC OFF SWITCH OPERATION
Turn ON/OFF the VDC OFF switch and check that the VDC OFF indicator lamp in the combination meter turns
ON/OFF correctly.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772605
1.CHECK VDC OFF SWITCH
Perform the VDC OFF switch co mponent inspection. Refer to BRC-82, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 2
NO >> Replace VDC OFF switch.
2.CHECK VDC OFF SWITCH HARNESS
1. Disconnect ABS actuator and electric unit (control unit) connec- tor.
2. Check continuity between ABS actuator and electric unit (control
unit) connector E125 (A) terminal 38 and VDC OFF switch con-
nector M253 (B) terminal 1.
3. Check continuity between ABS actuator and electric unit (control unit) connector E125 (A) terminal 38 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK VDC OFF SWITCH GROUND
Condition VDC OFF indicator lamp illumination status
VDC OFF switch: ON ON
VDC OFF switch: OFF OFF
ABS actuator and electric unit
(control unit) VDC OFF switch
Continuity
Connector Terminal Connector Terminal
A: E125 38B: M253 1Yes
ABS actuator and electric unit (control unit) —Contin u it y
Connector Terminal
A: E125 38Ground No
AWFIA0430ZZ
Revision: December 20092009 QX56

BRC-82
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
VDC OFF SWITCH
Check continuity between VDC OFF switch connector M253 terminal
2 and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Component InspectionINFOID:0000000003772606
INSPECTION PROCEDURE
1.CHECK VDC OFF SWITCH
1. Turn ignition switch OFF.
2. Disconnect VDC OFF switch connector.
3. Check continuity between VDC OFF switch terminals.
Is the inspection result normal?
YES >> Inspection End
NO >> Replace VDC OFF switch.
VDC OFF switch —Continuity
Connector Terminal
M253 2Ground Yes
AWFIA0031ZZ
VDC OFF switch
Condition Continuity
Te r m i n a l
1 − 2 When VDC OFF switch is pressed. Yes
When VDC OFF switch is released. No
PFIA0307E
Revision: December 20092009 QX56

ABS WARNING LAMPBRC-83
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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ABS WARNING LAMP
DescriptionINFOID:0000000003772607
× : ON –: OFF
Component Function CheckINFOID:0000000003772608
1.CHECK ABS WARNING LAMP OPERATION
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-83, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772609
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Condition ABS warning lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: December 20092009 QX56

BRC-84
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
BRAKE WARNING LAMP
BRAKE WARNING LAMP
DescriptionINFOID:0000000003772610
×
: ON –: OFF
NOTE:
• 1: Brake warning lamp will turn on in case of parking brake operation (when switch is ON) or of brake fluid level switch opera tion
(when brake fluid is insufficient).
• 2: After starting engine, brake warning lamp is turned off.
Component Function CheckINFOID:0000000003772611
1.BRAKE WARNING LAMP OPERATION CHECK
Check that the lamp illuminates after the ignition switch is turned ON, and turns OFF after the engine is
started.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-84, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772612
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Condition Brake warning lamp (Note 1)
Ignition switch OFF –
Ignition switch ON × (Note 2)
EBD function is malfunctioning. ×
Revision: December 20092009 QX56

VDC OFF INDICATOR LAMPBRC-85
< COMPONENT DIAGNOSIS > [VDC/TCS/ABS]
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VDC OFF INDICATOR LAMP
DescriptionINFOID:0000000003772613
× : ON –: OFF
Component Function CheckINFOID:0000000003772614
1.VDC OFF INDICATOR LAMP OPERATION CHECK 1
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> GO TO 2
NO >> Go to diagnosis procedure. Refer to BRC-85, "
Diagnosis Procedure".
2.VDC OFF INDICATOR LAMP OPERATION CHECK 2
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> Inspection End
NO >> Check VDC OFF switch. Refer to BRC-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772615
1.CHECK VDC OFF SWITCH
Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the
VDC OFF switch.
Is the inspection result normal?
YES >> GO TO 2
NO >> Check VDC OFF switch. Refer to BRC-81, "
Diagnosis Procedure".
2.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 3
NO >> Check items displayed by self-diagnosis.
3.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electric unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Condition VDC OFF indicator lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
VDC OFF switch turned ON. (VDC function is OFF.) ×
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: December 20092009 QX56

BRC-86
< COMPONENT DIAGNOSIS >[VDC/TCS/ABS]
SLIP INDICATOR LAMP
SLIP INDICATOR LAMP
DescriptionINFOID:0000000003772616
×
: ON –: OFF
Component Function CheckINFOID:0000000003772617
1.CHECK SLIP INDICATOR LAMP OPERATION
Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON.
Is the inspection result normal?
YES >> Inspection End
NO >> Go to diagnosis procedure. Refer to BRC-86, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003772618
1.CHECK SELF-DIAGNOSIS
Perform ABS actuator and electric unit (control unit) self-diagnosis. Refer to BRC-24, "
CONSULT-III Function
(ABS)".
Is the inspection result normal?
YES >> GO TO 2
NO >> Check items displayed by self-diagnosis.
2.CHECK COMBINATION METER
Check if the indication and operation of combination meter are normal. Refer to MWI-24, "
Diagnosis Descrip-
tion".
Is the inspection result normal?
YES >> Replace ABS actuator and electr ic unit (control unit). Refer to BRC-116, "Removal and Installa-
tion".
NO >> Replace combination meter. Refer to MWI-102, "
Removal and Installation".
Condition SLIP indicator lamp
Ignition switch OFF –
For 2 seconds after turning ON ignition switch ×
2 seconds later after turning ON ignition switch –
VDC/TCS function is malfunctioning. ×
ABS function is malfunctioning. ×
EBD function is malfunctioning. ×
Revision: December 20092009 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-87
< ECU DIAGNOSIS > [VDC/TCS/ABS]
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ECU DIAGNOSIS
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Reference ValueINFOID:0000000003772619
VALUES ON THE DIAGNOSIS TOOL
CAUTION:
The display shows the control unit calculation data, so a normal value might be displayed even in the
event the output circuit (harness) is open or short-circuited.
CONSULT-III MONITOR ITEM
Monitor item Display content Data monitor
Condition Reference value in
normal operation
FR LH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
FR RH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
RR LH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
RR RH SENSOR Wheel speed 0 [km/h (MPH)]
Vehicle stopped
Nearly matches the speed meter display
(± 10% or less) Vehicle running
(Note 1)
STOP LAMP SW Stop lamp switch signal status When brake pedal is depressed
ON
When brake pedal is released OFF
BATTERY VOLT Battery voltage supplied
to the ABS actuator
and electric unit (control unit) Ignition switch ON
10 – 16 V
GEAR Gear position determined by TCM 1st gear
2nd gear
3rd gear
4th gear
5th gear 1
2
3
4
5
SLCT LVR POSI A/T selector lever position P position
R position
N position
D positionP
R
N
D
OFF SW VDC OFF switch ON/OFF VDC OFF switch ON
(When VDC OFF indicator lamp is ON)
ON
VDC OFF switch OFF
(When VDC OFF indicator lamp is OFF) OFF
YAW RATE SEN Yaw rate detected by yaw rate/side/decel G
sensor When vehicle is stopped
Approx. 0 d/s
When vehicle turning −75 to 75 d/s
ACCEL POS SIG Throttle actuator opening/closing is dis-
played (linked with accelerator pedal) Accelerator pedal not depressed (ignition
switch is ON)
0 %
Accelerator pedal depressed (ignition
switch is ON) 0 - 100 %
Revision: December 20092009 QX56

BRC-88
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
SIDE G-SENSOR Transverse G detected by side G sensorVehicle stopped
Approx. 0 m/s
2
Vehicle turning rightNegative value
(m/s2)
Vehicle turning left Positive value
(m/s
2)
STR ANGLE SIG Steering angle detected by steering angle
sensor Straight-ahead
Approx. 0°
Steering wheel turned –720 to 720°
PRESS SENSOR Brake fluid pressure detected by front pres-
sure sensor With ignition switch turned ON and brake
pedal released
Approx. 0 bar
With ignition switch turned ON and brake
pedal depressed –40 to 300 bar
ENGINE SPEED With engine running With engine stopped
0 rpm
Engine running Almost in accor-
dance with tachome-
ter display
FLUID LEV SW Brake fluid level switch signal status When brake fluid level switch ON
ON
When brake fluid level switch OFF OFF
FR RH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR RH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR LH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
FR LH OUT SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
RR RH IN SOL Operation status of each solenoid valve Actuator (solenoid valve) is active (“AC-
TIVE TEST” with CONSULT-III) or actua-
tor relay is inactive (in fail-safe mode)
ON
When the actuator (solenoid valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: December 20092009 QX56