2006 INFINITI QX56 Factory Service Manual

maintenance schedule change time 4WD steering coolant temperature refuelling

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INFINITI QX56 2006 Factory Service Manual BRC-22
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
WFWA0320E

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-23
[VDC/TCS/ABS]
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Basic InspectionEFS004XN
BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level

TROUBLE DIAGNOSISBRC-23
[VDC/TCS/ABS]
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Basic InspectionEFS004XN
BRAKE FLUID LEVEL, FLUID LEAK, AND BRAKE PAD INSPECTION
1. Check fluid level in the brake fluid reservoir. If fluid level is low, add fluid.
2. Check the brake piping and around the ABS actuator and electric unit (control unit) for leaks. If there is
leaking or seeping fluid, check the following items.
If ABS actuator and electric unit (control unit) connection is loose, tighten the piping to the specified
torque and recheck for leaks.
If there is damage to the connection flare nut or ABS actuator and electric unit (control unit) threads,
replace the damaged part and recheck for leaks.
When there is fluid leaking or seeping from a fluid connection, use a clean cloth to wipe off the fluid and
recheck for leaks. If fluid is still seeping out, replace the damaged part. If the fluid is leaking at the ABS
actuator and electric unit (control unit), replace the ABS actuator and electric unit (control unit) assem-
bly.
CAUTION:
The ABS actuator and electric unit (control unit) cannot be disassembled and must be replaced
as an assembly.
3. Check the brake pads for excessive wear.
POWER SYSTEM TERMINAL LOOSENESS AND BATTERY INSPECTION
Make sure the battery positive cable, negative cable and ground connection are not loose. In addition, make
sure the battery is sufficiently charged.
ABS WARNING LAMP, SLIP INDICATOR LAMP AND VDC OFF INDICATOR LAMP INSPECTION
1. Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp (when VDC OFF switch is off), turn on for approximately 2 seconds when the ignition switch is turned ON. If they do not, check the
VDC OFF indicator lamp and the VDC OFF switch. Refer to BRC-56, "
VDC OFF SWITCH" . Check CAN
communications. If there are no errors with the VDC OFF switch or CAN communication system, check
combination meter. Refer to DI-5, "
COMBINATION METERS" .
2. Make sure the lamps turn off approximately 2 seconds after the ignition switch is turned ON. If the lamp does not turn off, conduct self-diagnosis.
3. With the engine running, make sure the VDC OFF indicator lamp turns on and off when the VDC OFF switch is turned on and off. If the indicator lamp status does not correspond to switch operation, check the
VDC OFF switch. Refer to BRC-56, "
VDC OFF SWITCH" .
4. Make sure ABS warning lamp, SLIP indicator lamp and VDC OFF indicator lamp turn off approximately 2 seconds after the engine is started. If ABS warning lamp, SLIP indicator lamp or VDC OFF indicator lamp
have not turned off 10 seconds after the engine has been started, conduct self-diagnosis of the ABS actu-
ator and electric unit (control unit).
5. After conducting the self-diagnosis, be sure to erase the error memory. Refer to BRC-28, "
CONSULT-II
Function (ABS)" .

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INFINITI QX56 2006 Factory Service Manual BRC-24
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Warning Lamp and Indicator TimingEFS004XO
X: ON
—: OFF
Control Unit Input/Output Signal StandardEFS004XP
REFERENCE VALUE FROM

BRC-24
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Warning Lamp and Indicator TimingEFS004XO
X: ON
—: OFF
Control Unit Input/Output Signal StandardEFS004XP
REFERENCE VALUE FROM CONSULT-II
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.
ConditionABS
warning lamp VDC OFF
indicator lamp SLIP
indicator lamp Remarks
When the ignition switch is OFF ——— —
After the ignition switch is turned
ON for approx. 1 second ×××
—
After the ignition switch is turned
ON for approx. 2 seconds ——— —
When the VDC OFF switch is
pressed (VDC function OFF) —
×——
ABS/TCS/VDC malfunction ×××
—
×× —When the ABS actuator and elec-
tric unit (control unit) is malfunc-
tioning (power supply or ground
malfunction).
When the VDC is malfunctioning —×× —
Monitor itemDisplay content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation
N POSI SIG PNP switch signal ON/
OFF conditionA/T shift position = N position ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"A/T shift position = other than
N positionsOFF
P POSI SIG PNP switch signal ON/
OFF conditionA/T shift position P position ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"A/T shift position = other than
P positionsOFF
GEAR A/T gear position 1st gear
1
—
2nd gear
2
3rd gear 3
4th gear 4
5th gear 5
FR RH SENSOR
FR LH SENSOR
RR RH SENSOR
RR LH SENSOR Wheel speedVehicle stopped
0 [km/h (MPH)]
BRC-38, "
Wheel Sensor
System Inspection"Vehicle running (Note 1) Almost in accor-
dance with speed-
ometer display
(within
±10%)
ACCEL POS SIG Open/close condition
of throttle valve (linked
with accelerator pedal).Accelerator pedal not
depressed (ignition switch is
ON)
0%
BRC-54, "
CAN Commu-
nication System Inspec-
tion"Depress accelerator pedal
(ignition switch is ON) 0 to 100%
ENGINE SPEED With engine running With engine stopped
0 rpm
BRC-39, "
Engine System
Inspection"Engine running Almost in accor-
dance with
tachometer display

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-25
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Revision: November 2009 2006 QX56
STR ANGLE SIGSteering angle
detected by steering
angle sensorStraight-ahead
Approx. 0 deg
BRC-40, "

TROUBLE DIAGNOSISBRC-25
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STR ANGLE SIGSteering angle
detected by steering
angle sensorStraight-ahead
Approx. 0 deg
BRC-40, "Steering Angle
Sensor System"Steering wheel turned –756 to 756 deg
YAW RATE SEN Yaw rate detected by
yaw rate sensorVehicle stopped Approx. 0 d/s
BRC-41, "
Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle running–100 to 100 d/s
SIDE G-SENSOR Transverse G detected
by side G-sensorVehicle stopped
Approx. 0 m/s
2BRC-41, "Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle running–16.7 to 16.7 m/s2
BATTERY VOLT Battery voltage sup-
plied to ABS actuator
and electric unit (con-
trol unit)Ignition switch ON
10 to 16VBRC-46, "
ABS/TCS/VDC
Control Unit Power and
Ground Systems Inspec-
tion"
STOP LAMP SW
Stop lamp switch oper-
ationBrake pedal depressed ON
BRC-45, "
Stop Lamp
Switch System Inspec-
tion"Brake pedal not depressed OFF
OFF SW VDC OFF switch
ON/OFF status VDC OFF switch ON
(When VDC OFF indicator
lamp is ON)
ON
BRC-56, "
VDC OFF
SWITCH"VDC OFF switch OFF
(When VDC OFF indicator
lamp is OFF) OFF
ABS WARN LAMP ABS warning lamp ON
condition (Note 2)ABS warning lamp ON ON
—
ABS warning lamp OFF OFF
MOTOR RELAY Operation status of
motor and motor relayIgnition switch ON or running
(ABS not activated)
OFF
BRC-44, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Ignition switch ON or engine
running (ABS activated) ON
ACTUATOR RLY Actuator relay opera-
tion statusVehicle stopped (Ignition
switch ON)
OFF
BRC-44, "
Actuator Motor,
Motor Relay, and Circuit
Inspection"Vehicle stopped (Engine run-
ning) ON
OFF LAMP VDC OFF indicator
lamp status (Note 3) When VDC OFF indicator
lamp is ON
ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"When VDC OFF indicator
lamp is OFF OFF
SLIP LAMP SLIP indicator lamp
status (Note 4)When SLIP indicator lamp is
ON
ON
BRC-54, "
CAN Commu-
nication System Inspec-
tion"When SLIP indicator lamp is
OFF OFF
Monitor item
Display content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation

Page 1053 of 3383

INFINITI QX56 2006 Factory Service Manual BRC-26
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Note 1: Confirm tire pressure is normal.
Note 2: ON/OFF timing of ABS warning lamp
ON: For approximately 2 seconds after ignitio

BRC-26
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
Note 1: Confirm tire pressure is normal.
Note 2: ON/OFF timing of ABS warning lamp
ON: For approximately 2 seconds after ignition switch is turned ON, or when a malfunction is detected.
OFF: Approximately 2 seconds after ignition switch is turned ON (when system is in normal operation) and TCS/VDC function is not
activated.
Note 3: ON/OFF timing of VDC OFF indicator lamp
ON: For approximately 2 seconds after ignition switch is turned ON, or when a malfunction is detected and VDC OFF switch is ON.
OFF: Approximately 2 seconds after ignition switch is turned ON (when system is in normal operation.) And when VDC OFF switch is
OFF.
Note 4: SLIP indicator lamp ON/OFF timing
ON: For approximately 2 seconds after ignition switch is turned ON, or when a malfunction is detected and TCS/VDC function is act i-
vated while driving. FR LH IN SOL
FR LH OUT SOL
FR RH IN SOL
FR RH OUT SOL
RR RH IN SOL
RR RH OUT SOL
RR LH IN SOL
RR LH OUT SOL
Solenoid valve opera-
tionActuator (solenoid) is active
(
“ACTIVE TEST ” with CON-
SULT-II) or actuator relay is
inactive (in fail-safe mode). ON
BRC-43, "
Solenoid and
VDC Change-Over Valve
System Inspection"
When actuator (solenoid) is
not active and actuator relay is
active (ignition switch ON). OFF
CV1
CV2
SV1
SV2 VDC switch-over valve
statusWhen actuator (switch-over
valve) is active (
“ACTIVE
TEST ” with CONSULT-II) or
actuator relay is inactive (when
in fail-safe mode). ON
When actuator (switch-over
valve) is not active and actua-
tor relay is active (ignition
switch ON). OFF
DECEL G-SEN Longitudinal accelera-
tion detected by Decel
G-SensorVehicle stopped Approx. 0 G
BRC-41, "
Yaw Rate/Side/
Decel G Sensor System
Inspection"Vehicle running-1.7 to 1.7 G
PRESS SENSOR Brake fluid pressure
detected by pressure
sensorDo not step on the Brake pedal
(When ignition switch is ON)
Approx. 0 bar
—
Step on the Brake pedal
(When ignition switch is ON) -40 to 300 bar
FLUID LEV SW ON/OFF status of
brake fluid level switchWhen brake fluid level switch
ON
ON
DI-31, "
WARNING
LAMPS"When brake fluid level switch
OFF OFF
VDC SIGNAL
TCS SIGNAL
ABS SIGNAL
EBD SIGNAL Signal statusVDC active
TCS active
ABS active
EBD active
ON
VDC system
TCS system
ABS system
EBD system
VDC not active
TCS not active
ABS not active
EBD not active OFF
VDC FAIL SIG
TCS FAIL SIG
ABS FAIL SIG
EBD FAIL SIG Fail signal statusVDC fail
TCS fail
ABS fail
EBD fail
ON
VDC system
TCS system
ABS system
EBD system
VDC normal
TCS normal
ABS normal
EBD normal OFF
Monitor item
Display content Data monitor
Note: Error inspection
checklist
Condition Reference value in
normal operation

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-27
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Revision: November 2009 2006 QX56
OFF: Approximately 2 seconds after ignition switch is turned ON (when system is in normal operation)

Page 1055 of 3383

INFINITI QX56 2006 Factory Service Manual BRC-28
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
CONSULT-II Function (ABS)EFS004XQ
CONSULT-II can display each diagnostic item using the diagnostic test modes shown following.
C

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INFINITI QX56 2006 Factory Service Manual TROUBLE DIAGNOSISBRC-29
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Revision: November 2009 2006 QX56
6. Select the required diagnostic location from the “SELECT DIAG
MODE ” screen.
For further infor

TROUBLE DIAGNOSISBRC-29
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Revision: November 2009 2006 QX56
6. Select the required diagnostic location from the “SELECT DIAG
MODE ” screen.
For further information, see the CONSULT-II Operation Manual.
SELF-DIAGNOSIS
Description
If an error is detected in the system, the ABS warning lamp will turn on. In this case, perform self-diagnosis as
follows:
Operation Procedure
1. Turn ignition switch OFF.
2. Connect CONSULT-II and CONSULT-II CONVERTER to the data link connector.
CAUTION:
If CONSULT-II is used with no connection of CONSULT-II CONVERTER, malfunctions might be
detected in self-diagnosis depending on control unit which carries out CAN communication.
3. Turn ignition switch ON.
4. Start engine and drive at approximately 30 km/h (19 MPH) or more for approximately 1 minute.
5. After stopping the vehicle, with the engine running, touch “START (NISSAN BASED VHCL)”, “ABS ”,
“SELF-DIAG RESULTS ” in order on the CONSULT-II screen.
CAUTION:
If “START (NISSAN BASED VHCL)” is touched immediately after starting the engine or turning on
the ignition switch, “ABS” might not be displayed in the SELECT SYSTEM screen. In this case,
repeat the operation from step 1.
6. The self-diagnostic results are displayed. (If necessary, the self-diagnostic results can be printed out by touching “PRINT”.)
When “NO DTC IS DETECTED ” is displayed, check the ABS warning lamp, SLIP indicator lamp and
VDC OFF indicator lamp.
7. Conduct the appropriate inspection from the display item list, and repair or replace the malfunctioning component.
8. Start engine and drive at approximately 30 km/h (19 MPH) or more for approximately 1 minute. CAUTION:
When a wheel sensor “short-circuit” is detected, if the vehicle is not driven at 30 km/h (19 MPH)
for at least 1 minute, the ABS warning lamp will not turn off even if the malfunction is repaired.
9. Turn ignition switch OFF to prepare for erasing the memory.
10. Start the engine and touch “START (NISSAN BASED VHCL)”, “ABS”, “SELF-DIAG RESULTS”, “ERASE”
in order on the CONSULT-II screen to erase the error memory.
If “ABS” is not indicated, go to GI-40, "
CONSULT-II Data Link Connector (DLC) Circuit" .
CAUTION:
If the error memory is not erased, re-conduct the operation from step 5.
11. For the final inspection, drive at approximately 30 km/h (19 MPH) or more for approximately 1 minute and confirm that the ABS warning lamp, SLIP indicator lamp, and VDC OFF indicator lamp are off.
BCIA0031E

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