2010 INFINITI QX56 ECU

BRC-26
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
DIAGNOSIS SYSTEM [
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
×: Applicable
–: Not applicable
ACTIVE TEST MODE
CAUTION:
• Do not perform active test while driving vehicle.
• Make sure to completely bleed air from brake system.
• The active test cannot be performed with the ABS warning lamp, VDC OFF indicator lamp, SLIP indi-
cator lamp or brake warning lamp on.
• ABS warning lamp, VDC OFF indicator lamp, SLIP indicator lamp and brake warning lamp are on
during active test.
NOTE:
• When active test is performed while depressing the pedal, the pedal depression amount will change. This is
normal. (Only solenoid valve and ABS motor.)
• “TEST IS STOPPED” is displayed 10 seconds after operation start.
• After “TEST IS STOPPED” is display ed, to perform test again, touch BACK.
Test Item
SOLENOID VALVE• When performing an active test of the ABS function, select the “MAIN SIGNAL S” for each test item.
• For ABS solenoid valve, touch “Up”, “Keep”, and “D own” on the display screen. For ABS solenoid valve
(ACT), touch “Up”, “ACT UP”, “ACT KEEP” and confirm that solenoid valves operate as shown in the table
below.
RELEASE SW NC
(On/Off) ––
×Release switch signal (On/Off) status is displayed.
“Off” indicates that the brake pedal is depressed. “On”
indicates that the brake pedal is released.
OHB FAIL
(On/Off) ––
×OHB fail status is displayed.
HBA FAIL
(On/Off) ––
×HBA fail status is displayed.
OHB SIG
(On/Off) ––
×OHB operation (On/Off) status is displayed.
HBA SIG
(On/Off) ––
×HBA operation (On/Off) status is displayed.
STP OFF RLY
(On/Off) ––
×Stop lamp relay signal (On/Off) status is displayed.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
Operation ABS solenoid valve ABS solenoid valve (ACT)
Up Keep Down Up ACT UP ACT KEEP
FR RH SOL FR RH IN SOL Off On On — —
—
FR RH OUT SOL Off Off On* — — —
FR LH SOL FR LH IN SOL Off On On — —
—
FR LH OUT SOL Off Off On* — — —
RR RH SOL RR RH IN SOL Off On On — —
—
RR RH OUT SOL Off Off On* — — —
RR LH SOL RR LH IN SOL Off On On — —
—
RR LH OUT SOL Off Off On* — — —
FR RH ABS SOLENOID (ACT) FR RH IN SOL — — — Off Off Off
FR RH OUT SOL — — — Off Off Off
CV1 ———OffOnOn
SV1
— — — Off On* Off
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-87
< ECU DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
ECU DIAGNOSIS
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Reference ValueINFOID:0000000005148081
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)
DECEL G-SEN Longitudinal acceleration detected by Decel
G-Sensor Vehicle stopped
Approx. 0 G
Vehicle running -1.7 to 1.7 G
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
Revision: April 20092010 QX56

BRC-88
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
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
RR 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
RR 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
RR 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
EBD WARN LAMP EBD warning lamp
(Note 2) When EBD warning lamp is ON
ON
When EBD warning lamp is OFF OFF
STOP LAMP SW Stop lamp switch signal status When brake pedal is depressed
ON
When brake pedal is released OFF
MOTOR RELAY Motor and motor relay operation When the motor relay and motor are op-
erating
ON
When the motor relay and motor are not
operating OFF
ACTUATOR RLY Actuator relay operation When the actuator relay is operating
ON
When the actuator relay is not operating OFF
ABS WARN LAMP ABS warning lamp
(Note 2) When ABS warning lamp is ON
ON
When ABS warning lamp is OFF OFF
OFF LAMP VDC OFF indicator lamp
(Note 2) When VDC OFF indicator lamp is ON
ON
When VDC OFF indicator lamp is OFF OFF
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
SLIP LAMP SLIP indicator lamp
(Note 2) When SLIP indicator lamp is ON
ON
When SLIP indicator lamp is OFF 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
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-89
< ECU DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
SLCT LVR POSI A/T selector lever position P position
R position
N position
D positionP
R
N
D
ENGINE SPEED With engine running With engine stopped
0 rpm
Engine running Almost in accor-
dance with tachome-
ter display
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
R POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = R position
ON
A/T shift position = other than R position OFF
4WD FAIL REQ
(Note 3) Transfer control unit fail-safe signal When transfer control unit is in fail-safe
mode
ON
When transfer control unit is normal OFF
N POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = N position
ON
A/T shift position = other than N position OFF
P POSI SIG Transmission range switch signal ON/OFF
condition A/T shift position = P position
ON
A/T shift position = other than P position OFF
CV1 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
CV2 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
SV1 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
SV2 VDC switch-over valve When actuator (switch-over valve) is ac-
tive (“ACTIVE TEST” with CONSULT-III)
or actuator relay is inactive (when in fail-
safe mode)
ON
When actuator (switch-over valve) is not
active and actuator relay is active (igni-
tion switch ON) OFF
2WD/4WD Drive axle 2WD model
2WD
4WD model 4WD
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56

BRC-90
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
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 %
SIDE G-SENSOR Transverse G detected by side G sensor Vehicle 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°
BST OPER SIG Active booster operation Active booster is active
ON
Active booster is inactive OFF
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
EBD SIGNAL EBD operation EBD is active
ON
EBD is inactive OFF
ABS SIGNAL ABS operation ABS is active
ON
ABS is inactive OFF
TCS SIGNAL TCS operation TCS is active
ON
TCS is inactive OFF
VDC SIGNAL VDC operation VDC is active
ON
VDC is inactive OFF
EBD FAIL SIG EBD fail-safe signal In EBD fail-safe
ON
EBD is normal OFF
ABS FAIL SIG ABS fail-safe signal In ABS fail-safe
ON
ABS is normal OFF
TCS FAIL SIG TCS fail-safe signal In TCS fail-safe
ON
TCS is normal OFF
VDC FAIL SIG VDC fail-safe signal In VDC fail-safe
ON
VDC is normal OFF
CRANKING SIG Crank operation Crank is active
ON
Crank is inactive OFF
FLUID LEV SW Brake fluid level switch signal status When brake fluid level switch ON
ON
When brake fluid level switch OFF OFF
PRESS SEN2 Brake fluid pressure detected by rear 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
DELTA S SEN Value detected by delta stroke sensor When brake pedal is depressed
1.05 - 1.80 mm
When brake pedal is released 0.00 mm (+0.6/-0.4)
RELEASE SW NO Active booster signal status When brake pedal is depressed
ON
When brake pedal is released OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-91
< ECU DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
NOTE:
• 1: Confirm tire pr essure is normal.
• 2: On and off timing for warning lamp and indicator lamp.
• 3: Only 4WD models.
- ABS warning lamp: Refer to BRC-82, "
Description".
- Brake warning lamp: Refer to BRC-83, "
Description".
- VDC OFF indicator lamp: Refer to BRC-84, "
Description".
- SLIP indicator lamp: Refer to BRC-86, "
Description".
TERMINAL LAYOUT
RELEASE SW NC Active booster signal status When brake pedal is depressed OFF
When brake pedal is released
ON
OHB FAIL OHB fail safe signal OHB is active
ON
OHB is inactive OFF
HBA FAIL HBA fail safe signal HBA is active
ON
HBA is inactive OFF
OHB SIG OHB operation In OHB fail-safe
ON
OHB is normal OFF
HBA SIG HBA operation In HBA fail-safe
ON
HBA is normal OFF
STP OFF RLY Stop lamp relay signal When stop lamp relay is ON
ON
When stop lamp relay is OFF OFF
Monitor item
Display content Data monitor
Condition Reference value in
normal operation
AWFIA0032ZZ
Revision: April 20092010 QX56

BRC-92
< ECU DIAGNOSIS >[VDC/TCS/ABS]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Wiring Diagram - BRAKE CONTROL SYSTEM -
INFOID:0000000005148082
ABFWA0081GB
Revision: April 20092010 QX56

ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)BRC-93
< ECU DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
ABFWA0082GB
Revision: April 20092010 QX56