display INFINITI QX56 2011 Factory Service Manual

BCS
U1010 CONTROL UNIT (CAN)BCS-71
< DTC/CIRCUIT DIAGNOSIS >
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U1010 CONTROL UNIT (CAN)
DTC LogicINFOID:0000000006274832
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006274833
1.REPLACE BCM
When DTC “U1010” is detected, replace BCM.
>> Replace BCM. Refer to BCS-81, "
Removal and Installation".
DTCCONSULT-III display de-
scription DTC Detection Condit
ion Possible cause
U1010 CONTROL UNIT (CAN) BCM de tected internal CAN communication circuit malfunction. BCM
Revision: 2010 May2011 QX56

BCS-72
< DTC/CIRCUIT DIAGNOSIS >
U0415 VEHICLE SPEED
U0415 VEHICLE SPEED
DescriptionINFOID:0000000006274834
U0415 is displayed if any unusual condition is present in the reception status of the vehicle speed signal from
the ABS actuator and electric unit (control unit).
DTC LogicINFOID:0000000006274835
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase the DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result” of BCM with CONS ULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-72, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274836
1.ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAG RESULTS
Perform “Self-Diagnostic Result” of ABS actuator and electric unit (control unit) with CONSULT-III. Refer to
BRC-40, "
CONSULT-III Function".
Is any DTC detected?
YES >> Repair or replace the malfunctioning part.
NO >> Replace BCM. Refer to BCS-81, "
Removal and Installation".
DTC CONSULT-III display
description DTC Detection Condition Probable cause
U0415 VEHICLE SPEED When the vehicle speed signal received from
the ABS actuator and elec
tric unit (control
unit) remains abnormal for 2 seconds or more.  ABS actuator and electric unit (control unit)
BCM
Revision: 2010 May2011 QX56

BCS
B2562 LOW VOLTAGEBCS-73
< DTC/CIRCUIT DIAGNOSIS >
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B2562 LOW VOLTAGE
DTC LogicINFOID:0000000006274837
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result ” of BCM with CONSULT-III, when passed 120 seconds or more after
the ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-73, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274838
1.CHECK POWER SUPPLY CIRCUIT
Check BCM power supply circuit. Refer to BCS-75, "
Diagnosis Procedure".
Is the circuit normal?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Repair the malfunctioning part.
DTC CONSULT-III display
description DTC Detection Condition Possible cause
B2562 LOW VOLTAGE When the power supply voltage to BCM remains less
than 8.8 V for 120 seconds or more Harness or connector (power supply
circuit)
Revision: 2010 May2011 QX56

BCS-74
< DTC/CIRCUIT DIAGNOSIS >
B26E7 TPMS CAN COMM
B26E7 TPMS CAN COMM
DTC LogicINFOID:0000000006274839
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.DTC CONFIRMATION
1. Erase the DTC.
2. Turn ignition switch OFF.
3. Perform the “Self Diagnostic Result” of BCM with CONS ULT-III, when passed 2 seconds or more after the
ignition switch is turned ON.
Is any DTC detected?
YES >> Refer to BCS-74, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006274840
NOTE:
If DTC “B26E7” detected along with DTC “U1000” , first diagnose the DTC “U1000”. Refer to BCS-70, "
Diagno-
sis Procedure".
1.LOW TIRE PRESSURE WARNING CONTRO L UNIT SELF DIAGNOSTIC RESULT
Perform “Self Diagnostic Result” of low tire pressu re warning control unit with CONSULT-III. Refer to WT-12,
"CONSULT-III Function".
Is any DTC detected?
YES >> GO TO 2.
NO >> GO TO 4.
2.LOW TIRE PRESSURE WARNING CONTROL UNIT DIAGNOSIS
Perform low tire pressure warning control uni t component diagnosis of detected DTC. Refer to WT-18, "
DTC
Index".
>> GO TO 3.
3.BCM SELF DIAGNOSTIC RESULT
Erase DTC of BCM, and perform “Self Diagnostic Result” again.
Is DTC
“B26E7” detected?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> INSPECTION END
4.REPLACE LOW TIRE PRESSURE WA RNING CONTROL UNIT TEMPORARILY
Remove low tire pressure warning control unit, and in stall normal low tire pressure warning control unit.
>> GO TO 5.
5.BCM SELF-DIAGNOSTIC RESULT
Erase DTC of BCM, and perform “S elf Diagnostic Result” of BCM again.
Is DTC
“B26E7” detected?
YES >> Replace BCM. Refer to BCS-81, "Removal and Installation".
NO >> Replace low tire pressure warning control unit. Refer to WT-65, "
Removal and Installation".
DTC CONSULT-III display description DTC Detection Condition Probable cause
B26E7 TPMS CAN COMM When ignition switch is ON, BCM cannot re-
ceived CAN communication signal from low
tire pressure warn
ing control unit.  CAN communication system
 Low tire pressure warning control unit
BCM
Revision: 2010 May2011 QX56

BRC-40
< SYSTEM DESCRIPTION >[WITH VDC]
DIAGNOSIS SYSTEM [
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
CONSULT-III FunctionINFOID:0000000006222578
APPLICATION ITEMS
CONSULT-III can display each diagnostic item using the diagnostic test modes as follows.
*: The following diagnosis information is erased by erasing.
DTC
 Freeze frame data (FFD)
ECU IDENTIFICATION
ABS actuator and electric unit (cont rol unit) part number can be read.
SELF DIAGNOSTIC RESULT
Refer to BRC-51, "DTC Index".
When “CRNT” is displayed on self-diagnosis result,
 The system is presently malfunctioning.
When “PAST” is displayed on self-diagnosis result, System malfunction in the past is detect ed, but the system is presently normal.
Freeze frame data (FFD)
DATA MONITOR
×: Applicable
Mode Function description
ECU identification Parts number of ABS actuator and electric unit (control unit) can be read.
Self Diagnostic Result Self-diagnostic results and freeze frame data can be read and erased quickly.
*
DATA MONITOR Input/Output data in the ABS actuator and electric unit (control unit) can be read.
ACTIVE TEST Diagnostic Test Mode in
which CONSULT-III drives some act uators apart from the ABS actuator and
electric unit (control unit) and also shifts some parameters in a specified range.
WORK SUPPORT Components can be quickly and accurately adjusted.
Item name Display item
IGN counter
(0 − 39) The number of times that ignition switch is tu
rned ON after the DTC is detected is displayed.
 When “0” is displayed: It indicates that the system is presently malfunctioning.
 When except “0” is displayed: It indicates that system malfunction in the past is detected, but the system is pres- ently normal.
NOTE:
Each time when ignition switch is turned OFF to ON, numerical number increases in 1 → 2 → 3...38 → 39. When
the operation number of times exceeds 39, the number do not increase and “39” is displayed until self-diagnosis
is erased.
Item (Unit) Monitor item selection
Note
INPUT SIGNALS MAIN ITEMS
FR LH SENSOR
[km/h (MPH)] ××Wheel speed calculated by front LH wheel sensor is dis-
played.
FR RH SENSOR
[km/h (MPH)] ××Wheel speed calculated by front RH wheel sensor is dis-
played.
RR LH SENSOR
[km/h (MPH)] ××
Wheel speed calculated by rear LH wheel sensor is dis-
played.
RR RH SENSOR
[km/h (MPH)] ××Wheel speed calculated by rear RH wheel sensor is dis-
played.
DECEL G-SEN
(G) ××
Decel G detected by decel G sensor is displayed.
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
BRC-41
< SYSTEM DESCRIPTION > [WITH VDC]
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FR RH IN SOL
(On/Off) ×Operation status of front
RH wheel ABS IN valve is dis-
played.
FR RH OUT SOL
(On/Off) ×Operation status of front
RH wheel ABS OUT valve is dis-
played.
FR LH IN SOL
(On/Off) ×
Operation status of front LH wheel ABS IN valve is dis-
played.
FR LH OUT SOL
(On/Off) ×Operation status of front LH wheel ABS OUT valve is dis-
played.
RR RH IN SOL
(On/Off) ×
Operation status of rear RH wh eel ABS IN valve is displayed
RR RH OUT SOL
(On/Off) ×
Operation status of rear RH wheel ABS OUT valve is dis-
played.
RR LH IN SOL
(On/Off) ×Operation status of rear LH
wheel ABS IN valve is dis-
played.
RR LH OUT SOL
(On/Off) ×Operation status of rear LH
wheel ABS OUT valve is dis-
played.
EBD WARN LAMP
(On/Off) Brake warning lamp ON/OFF status is displayed.
(Note 1)
STOP LAMP SW
(On/Off)××
Stop lamp switch signal input status is displayed.
MOTOR RELAY
(On/Off) ×
ABS motor and motor relay status is displayed.
ACTUATOR RLY
(On/Off) ×
ABS actuator relay status is displayed.
ABS WARN LAMP
(On/Off) ×
ABS warning lamp ON/OFF status is displayed.
(Note 1)
OFF LAMP
(On/Off) ×
VDC OFF indicator lamp ON/OFF status is displayed.(Note 1)
OFF SW
(On/Off) ××
VDC OFF switch signal input status is displayed.
SLIP/VDC LAMP
(On/Off) ×
VDC warning lamp ON/OFF status is displayed.
(Note 1)
BATTERY VOLT
(V) ××Voltage supplied to ABS actuator and electric unit (control
unit) is displayed.
GEAR ××Current gear position judged from current gear position sig-
nal is displayed.
ENGINE SPEED
(tr/min) ××
Engine speed status is displayed.
YAW RATE SEN
(d/s) ××
Yaw rate detected by yaw rate sensor is displayed.
R POSI SIG
(On/Off) R range signal input status judged from R range signal is
displayed.
4WD MODE MON
(Note 2)
(AUTO/LOCK/##) ××
4WD control status is displayed.
N POSI SIG
(On/Off) N range signal input status judged from N range signal is
displayed.
CV1
(On/Off) Cut valve 1 operation status is displayed.
CV2
(On/Off) Cut valve 2 operation status is displayed.
SV1
(On/Off) Suction valve 1 operation status is displayed.
Item (Unit)
Monitor item selection
Note
INPUT SIGNALS MAIN ITEMS
Revision: 2010 May2011 QX56

BRC-42
< SYSTEM DESCRIPTION >[WITH VDC]
DIAGNOSIS SYSTEM [
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
Note 1: Refer to BRC-16, "System Description" for ON/OFF conditions of each warning lamp and indicator
lamp.
Note 2: Models with 4WD System
Note 3: Models with Advanced Driver Assistance System
Note 4: USS means “hill start assist”
ACTIVE TEST
The active test is used to determine and identify details of a malfunction, based on self-diagnosis test result
sand data obtained in the DATA MONITOR. In response to instructions from CONSULT-III, instead of those
SV2
(On/Off) Suction valve 2 operation status is displayed.
STOP LAMP SW2
(On/Off) Stop lamp switch signal input status is displayed.
ACCEL POS SIG
(%) ×
Displays the Accelerator pedal position
SIDE G-SENSOR
(m/s
2) ×
Side G detected by side G sensor is displayed.
STR ANGLE SIG
( ° ) ×
Steering angle detected by steering angle sensor is dis-
played.
PRESS SENSOR
(bar) ×Detects the brake fluid pressure of master cylinder part is
displayed.
ACCUM PRESS SEN
(bar) Detects the brake fluid pressure of accumulator is dis-
played.
CONT PRESS SEN
(Note 3)
(bar) Detects the brake fluid pressure of control pressure sensor
is displayed
EBD SIGNAL
(On/Off) EBD operation status is displayed.
ABS SIGNAL
(On/Off) ABS operation status is displayed.
TCS SIGNAL
(On/Off) TCS operation status is displayed.
VDC SIGNAL
(On/Off) VDC operation status is displayed.
EBD FAIL SIG
(On/Off) EBD fail-safe signal status is displayed.
ABS FAIL SIG
(On/Off) ABS fail-safe signal st
atus is displayed.
TCS FAIL SIG
(On/Off) TCS fail-safe signal status is displayed.
VDC FAIL SIG
(On/Off) VDC fail-safe signal status is displayed.
CRANKING SIG
(On/Off) Cranking status is displayed.
FLUID LEV SW
(On/Off) ×Brake fluid level signal input status via CAN communication
is displayed.
PARK BRAKE SW
(On/Off) ×Parking brake switch signal input status via CAN communi-
cation is displayed.
STP ON RLY
(On/Off) Stop lamp switch relay status is displayed.
USS SIG
(Note 4)
(On/Off) hill start assist operation status is displayed.
Item (Unit)
Monitor item selection
Note
INPUT SIGNALS MAIN ITEMS
Revision: 2010 May2011 QX56

DIAGNOSIS SYSTEM [ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
BRC-43
< SYSTEM DESCRIPTION > [WITH VDC]
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from ABS actuator and electric unit (control unit) on the vehi cle, a drive signal is sent to the actuator to check
its operation.
CAUTION:
 Never perform ACTIVE TEST while driving the vehicle.
 Always bleed air from brake system before active test.
 Never perform active test when system is malfunctioning.
NOTE:
 When active test is performed while depressing the pedal, the pedal depressing stroke may change. This is
not a malfunction.
 “TEST IS STOPPED” is displayed approx. 10 seconds after operation start.
 When performing active test again after “TEST IS STOPPED” is displayed, select “BACK”.
 ABS warning lamp, brake warning lamp and VDC warning lamp may turn ON during active test. This is not a malfunction.
ABS IN Valve and ABS OUT Valve
When “Up”, “Keep” or “Down” is selected on display scr een, the following items are displayed when system is
normal.
*: Immediately after being selected, status is “O n”. Status changes to “Off” after approx. 2 seconds.
ABS IN Valve (ACT) and ABS OUT Valve (ACT)
When “Up”, “ACT KEEP” or “ACT UP” is selected on display screen, the following items are displayed when
system is normal.
Test item Display Item Display
Up Keep Down
FR RH SOL FR RH IN SOL Off On* On*
FR RH OUT SOL Off Off On*
FR LH SOL FRLH 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*
Test item Display Item Display
Up ACT KEEP ACT UP
FR RH SOL (ACT) FR RH IN SOL Off Off On*
FR RH OUT SOL Off Off Off
CV1 Off On* On*
SV1 Off Off On*
FR LH SOL (ACT) FR LH IN SOL Off Off On*
FR LH OUT SOL Off Off Off
CV1 Off On* On*
SV1 Off Off On*
RR RH SOL (ACT) RR RH IN SOL Off Off On*
RR RH OUT SOL Off Off Off
CV2 Off On* On*
SV2 Off Off On*
RR LH SOL (ACT) RR LH IN SOL Off Off On*
RR LH OUT SOL Off Off Off
CV2 Off On* On*
SV2 Off Off On*
Revision: 2010 May2011 QX56

BRC-44
< SYSTEM DESCRIPTION >[WITH VDC]
DIAGNOSIS SYSTEM [
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL
UNIT)]
*: Immediately after being selected, status is “O n”. Status changes to “Off” after approx. 2 seconds.
Stop Lamp ON Relay
When “On” or “Off” is selected on display screen, t he following items are displayed when system is normal.
NOTE:
Display occasionally changes On/Off for a moment after ignition switch is turned ON. This is operation for
checking purposes and is not a malfunction.
WORK SUPPORT
Test item Display Item Display
On Off
STOP LAMP ON RELAY STOP LAMP ON RELAY On Off
Conditions Description
ST ANGLE SENSOR ADJUSTMENT Perform neutral position adjustment of steering angle sensor.
DECEL G SENSOR CALIBRATION Perform decel G sensor calibration.
Revision: 2010 May2011 QX56

BRC-50
< ECU DIAGNOSIS INFORMATION >[WITH VDC]
ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
*1: Models with 4WD System
*2: Models with Advanced Driver Assistance System
Protection FunctionINFOID:0000000006222581
The VDC warning lamp, ABS warning lamp and brake warning lamp turns ON and DTC “C118E” may be
detected in self-diagnosis result of “ABS” when the br
ake pedal is excessively operated, such as air bleeding.
This is not a system malfunction because this occurs due to the temporary decrease in accumulator fluid pres-
sure. The system returns to normal condition when the accu mulator fluid pressure reaches the specified pres-
sure with the ignition switch ON and the VDC warning lamp, ABS warning lamp, and brake warning lamp turn
OFF. After these steps, erase self-diagnos is results for “ABS” with CONSULT-III.
NOTE:
D T C “ C 1111 ” i s d e t e c t e d i n s e l f - d i agnosis results of “ABS” when the a ccumulator system has a malfunction.
DTC Inspection Priority ChartINFOID:0000000006222582
When multiple DTCs are displayed simultaneously, check one by one depending on the following priority list.
C1170 When the information in ABS actuator and electric unit (control unit) is not the same. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
C118E When performing excessive brake pedal operation with the vehicle stopped. [When
accumulator fluid pressure reaches 11.43 MPa (114 bar, 116.6 kg/cm
2, 1657 psi) af-
ter reaching 17.3 MPa (173 bar, 176.5 kg/cm2, 2509 psi.] The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential
(BLSD) function
U1000 When CAN communication signal is not continuously received for 2 seconds or
more. The following functions are sus-
pended.
 VDC function
 TCS function
 ABS function
 hill start assist function
 Brake limited slip differential
(BLSD) function
DTC Malfunction detected condition Fail-safe condition
DTC
 VDC warning lamp
 ABS warning lamp
 Brake warning lamp Condition Description protection function
C118E ON When temporary decrease in accumulator fluid pres-
sure.
NOTE:
System is not malfunction. The following functions are suspended
temporarily
 VDC function
 TCS function
 ABS function
 EBD function
 hill start assist function
 Brake limited slip differential (BLSD)
function
Priority Detected item (DTC)
1  U1000 CAN COMM CIRCUIT
2  C1170 VARIANT CODING
Revision: 2010 May2011 QX56