ECU INFINITI QX56 2006 Factory Service Manual

IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)BL-145
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Revision: November 2009 2006 QX56
Trouble DiagnosesEIS0061O
SYMPTOM MATRIX CHART 1
Self-diagnosis related item
*: When IVIS (NATS) detects a malfunction, the security indicator lights up while ignition key is in the “ON” position.
Symptom
Displayed
“SELF-DIAG
RESULTS ” on CON-
SULT-II screen. Diagnostic Procedure
(Reference page) System
(Malfunctioning part or
mode) Reference Part No. Of
Illustration On System
Diagram

Security indicator
lighting up*

Engine cannot be
started CHAIN OF ECM-IMMU
[P1612] PROCEDURE 1
(BL-147
) In rare case,
“CHAIN OF
ECM-IMMU ” might be
stored during key regis-
tration procedure, even if
the system is not mal-
functioning. —
Open circuit in battery
voltage line of BCM cir-
cuit C1
Open circuit in ignition
line of BCM circuit C2
Open circuit in ground
line of BCM circuit C3
Open or short circuit
between BCM and ECM
communication line C4
ECM B
BCM A
DIFFERENCE OF KEY [P1615] PROCEDURE 2
(BL-148
) Unregistered key D
BCM A
CHAIN OF IMMU-KEY [P1614] PROCEDURE 5
(BL-151
) Malfunction of key ID
chip
E5
Communication line
between ANT/ AMP and
BCM:
Open circuit or short cir-
cuit of battery voltage
line or ground line E1
E2
Open circuit in power
source line of ANT/ AMP
circuit E3
Open circuit in ground
line of ANT/ AMP circuit E4
NATS antenna amp. E6
BCM A
ID DISCORD, IMM-ECM [P1611] PROCEDURE 3
(BL-149
) System initialization has
not yet been completed.
F
ECM B
LOCK MODE [P1610] PROCEDURE 4
(BL-150
) LOCK MODE
D
Security indicator light-
ing up* DON'T ERASE
BEFORE CHECKING ENG DIAG WORK FLOW
(BL-144
) Engine trouble data and
IVIS (NATS) trouble data
have been detected in
ECM
—

BL-146
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
Revision: November 20092006 QX56
SYMPTOM MATRIX CHART 2
Non self-diagnosis related item
*: CONSULT-II self-diagnostic results display screen “no malfunction is detected ”.
DIAGNOSTIC SYSTEM DIAGRAM
Symptom Diagnostic Procedure
(Reference page) System
(Malfunctioning part or mode) Reference Part No. Of Illustra-
tion On System Diagram
Security indicator does not light
up*. PROCEDURE 6
(BL-154
) Combination meter (security
indictor lamp)
—
Open circuit between fuse and
BCM —
BCM A
WIIA0550E

BL-154
IVIS (INFINITI VEHICLE IMMOBILIZER SYSTEM-NATS)
Revision: November 20092006 QX56
Diagnostic Procedure 6EIS0061U
“SECURITY INDICATOR LAMP DOES NOT LIGHT UP”
1. CHECK FUSE
Check 10A fuse [No.19, located in the fuse block (J/B)]
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
2. CHECK SECURITY INDICATOR LAMP
1. Start engine and turn ignition switch OFF.
2. Check the security indicator lamp lights up.
OK or NG
OK >> Inspection End.
NG >> GO TO 3.
3. CHECK SECURITY INDICATOR LAMP POWER SUPPLY CIRCUIT
1. Disconnect security indicator lamp.
2. Check voltage between security indicator lamp connector M24 terminal 8 and ground.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace harness.
4. CHECK BCM (NATS CONTROL UNIT) FUNCTION
1. Connect security indicator lamp.
2. Disconnect BCM.
3. Check voltage between BCM connector M18 terminal 23 and ground.
OK or NG
OK >> BCM is malfunctioning.

Replace BCM. Ref. part No. A

Perform initialization with CONSULT-II.

For initialization, refer to “CONSULT-II Operation
Manual NATS-IVIS/NVIS ”.
NG >> Check the following:

Harness for open or short between security indicator lamp and BCM (NATS control unit).

Indicator lamp condition
Security indicator lamp should light up.
8 - Ground
:Battery voltage
LIIA1072E
23 - Ground :Battery voltage
LIIA0523E

BRAKE PIPING AND HOSEBR-13
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Revision: November 2009 2006 QX56
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinder
body, and tighten union bolt. Refer to BR-12, "
Hydraulic Circuit" .
CAUTION:
Do not reuse copper washer.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten flare nut using a flare nut wrench.
4. Refill brake fluid and bleed air. Refer to BR-11, "
Bleeding Brake
System" .
Removal and Installation of Rear Brake Hose EFS004W7
REMOVAL
1. Drain brake fluid. Refer to BR-10, "Drain and Refill" .
2. Using a flare nut wrench, remove brake tube from brake hose.
3. Remove lock plate and brake hose from bracket.
4. Remove union bolt, and then remove brake hose from cylinder body.
INSTALLATION
1. Install brake hose by aligning with the protrusion on cylinder body, and tighten union bolt. Refer to BR-12, "
Hydraulic Circuit" .
CAUTION:
Do not reuse copper washers.
2. Insert brake hose end through bracket, then secure it to bracket with lock plate.
3. Install brake tube to brake hose, then tighten flare nut to using a flare nut wrench. Refer to BR-12, "
Hydraulic Circuit" .
4. Refill brake fluid and bleed air. Refer to BR-11, "
Bleeding Brake
System" .
LFIA0214E
LFIA0213E
LFIA0212E
LFIA0213E

REAR DISC BRAKEBR-29
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Revision: November 2009 2006 QX56
2. Install cylinder body and tighten bolts to specification. Refer to BR-27, "Components" .
CAUTION:
Before installing cylinder body to the vehicle, wipe off mating surface of cylinder body.
3. Install brake hose to cylinder body and tighten union bolt to specification as necessary. Refer to BR-27,
"Components" .
CAUTION:

Do not reuse copper washers.

Securely attach brake hose to protrusion on cylinder body.
4. Refill new brake fluid and bleed air as necessary. Refer to BR-11, "
Bleeding Brake System" .
5. Install tires to the vehicle. Refer to WT-7, "
Rotation" .
Disassembly and Assembly of Brake CaliperEFS004WP
DISASSEMBLY
1. Remove pads from cylinder body.
2. Remove sliding sleeve and boot from cylinder body.
3. Place a wooden block as shown, and blow air into union bolt hole to remove piston and piston boot.
CAUTION:
Do not get your fingers caught in piston.
4. Using a suitable tool, remove piston seal from cylinder body as shown.
CAUTION:
Be careful not to damage cylinder body inner wall.
CALIPER INSPECTION
Cylinder Body
CAUTION:

Use new brake fluid to clean. Do not use mineral oils such as gasoline or kerosene. Refer to MA-
11 , "RECOMMENDED FLUIDS AND LUBRICANTS" .

Check inside surface of cylinder body for score, rust wear, damage or foreign materials. If any of
the above conditions are observed, replace cylinder body.

Minor damage from rust or foreign materials may be eliminated by polishing surface with a fine
emery paper. Replace cylinder body if necessary.
To r q u e M e m b e r
Check for wear, cracks, and damage. If damage or deformation is present, replace the affected part.
Piston
CAUTION:

Piston sliding surface is plated, do not polish with emery paper even if rust of foreign materials
are stuck to sliding surface.

Check piston for score, rust, wear, damage or presence of foreign materials. Replace if any of the
above conditions are observed.
BRD0041D
PFIA0269E

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.
CONSULT-II BASIC 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-diag-
nosis depending on control unit which carries out CAN
communication.
3. Turn ignition switch ON.
4. Touch “START (NISSAN BASED VHCL) ”.
5. Touch “ABS” in the “SELECT SYSTEM ” screen.
If “ABS ” is not indicated, go to GI-40, "
CONSULT-II Data Link
Connector (DLC) Circuit" .
ABS diagnostic mode Description
WORK SUPPORT Supports inspection and adjustments. Commands are transmitted to the ABS actuator and electric
unit (control unit) for setting the status suitable for required operation, input/output signals are
received from the ABS actuator and electric unit (control unit) and received data is displayed.
SELF-DIAG RESULTS Displays ABS actuator and electric unit (control unit) self-diagnosis results. DATA MONITOR Displays ABS actuator and electric unit (control unit) input/output data in real time.
CAN DIAG SUPPORT MNTR The result of transmit/receive diagnosis of CAN communication can be read. ACTIVE TEST Operation of electrical loads can be checked by sending drive signal to them.
FUNCTION TEST Conducted by CONSULT-II instead of a technician to determine whether each system is "OK" or
"NG".
ECU PART NUMBER ABS actuator and electric unit (control unit) part number can be read.
BBIA0369E
BCIA0029E
BCIA0030E

TROUBLE DIAGNOSISBRC-33
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Revision: November 2009 2006 QX56
CAUTION:
When “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 2.
3. Return to the SELECT MONITOR ITEM screen, and touch “ECU INPUT SIGNALS”, “MAIN SIGNALS ”, or
“SELECTION FROM MENU ”. Refer to the following information.
4. When “START” is touched, the data monitor screen is displayed.
Display Item List
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU
GEAR ××× Gear position judged by PNP
switch signal is displayed.
FR RH SENSOR
(km/h, MPH) ××× Wheel speed calculated by front
RH wheel sensor signal is dis-
played.
FR LH SENSOR
(km/h, MPH) ××× Wheel speed calculated by front LH
wheel sensor signal is displayed.
RR RH SENSOR
(km/h, MPH) ××× Wheel speed calculated by rear RH
wheel sensor signal is displayed.
RR LH SENSOR
(km/h, MPH) ×××
Wheel speed calculated by rear LH
wheel sensor signal is displayed.
BATTERY VOLT
(V) ××× Voltage supplied to ABS actuator
and electric unit (control unit) is dis-
played.
N POSI SIG ––× Shift position judged by PNP switch
signal.
P POSI SIG ––× Shift position judged by PNP switch
signal.
ACCEL POS SIG
(%) ×
–×Throttle valve open/close status
judged by CAN communication sig-
nal is displayed.
ENGINE SPEED
(rpm) ××× Engine speed judged by CAN com-
munication signal is displayed.
STR ANGLE SIG
(deg) ×
–×Steering angle detected by steering
angle sensor is displayed.
YAW R AT E S E N
(d/s) ×××
Yaw rate detected by yaw rate sen-
sor is displayed.
DECEL G-SEN
(d/s) ××× Longitudinal acceleration detected
by decel G-sensor is displayed.
SIDE G-SENSOR
(m/s
2 ) ×
– × Transverse acceleration detected
by side G-sensor is displayed.
STOP LAMP SW
(ON/OFF) ××× Stop lamp switch (ON/OFF) status
is displayed.
OFF SW
(ON/OFF)
×× × VDC OFF switch (ON/OFF) status
is displayed.
ABS WARN LAMP
(ON/OFF) –
×× ABS warning lamp (ON/OFF) status
is displayed.
SLIP LAMP
(ON/OFF) –
×× SLIP indicator lamp (ON/OFF) sta-
tus is displayed.
FR LH IN SOL
(ON/OFF) –
×× Front LH IN ABS solenoid (ON/
OFF) status is displayed.
FR LH OUT SOL
(ON/OFF) –
×× Front LH OUT ABS solenoid (ON/
OFF) status is displayed.

BRC-34
[VDC/TCS/ABS]
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
RR RH IN SOL
(ON/OFF)–
×× Rear RH IN ABS solenoid (ON/
OFF) status is displayed.
RR RH OUT SOL
(ON/OFF) –
×× Rear RH OUT ABS solenoid (ON/
OFF) status is displayed.
FR RH IN SOL
(ON/OFF) –
×× Front RH IN ABS solenoid (ON/
OFF) status is displayed.
FR RH OUT SOL
(ON/OFF) –
×× Front RH OUT ABS solenoid (ON/
OFF) status is displayed.
RR LH IN SOL
(ON/OFF) –
×× Rear LH IN ABS solenoid (ON/
OFF) status is displayed.
RR LH OUT SOL
(ON/OFF) –
×× Rear LH OUT ABS solenoid (ON/
OFF) status is displayed.
OFF LAMP
(ON/OFF) –
×× OFF Lamp (ON/OFF) status is dis-
played.
MOTOR RELAY
(ON/OFF) –
×× ABS motor relay signal (ON/OFF)
status is displayed.
ACTUATOR RLY
(ON/OFF) –
×× ABS actuator relay signal (ON/
OFF) status is displayed.
CV1
(ON/OFF) ––
×Front side switch-over solenoid
valve (cut valve) (ON/OFF) status is
displayed.
CV2
(ON/OFF) ––
×Rear side switch-over solenoid
valve (cut-valve) (ON/OFF) status
is displayed.
SV1
(ON/OFF) ––
×Front side switch-over solenoid
valve (suction valve) (ON/OFF) sta-
tus is displayed.
SV2
(ON/OFF) ––
×Rear side switch-over solenoid
valve (suction valve) (ON/OFF) sta-
tus is displayed.
VDC FAIL SIG
(ON/OFF) ––
×VDC fail signal (ON/OFF) status is
displayed.
TCS FAIL SIG
(ON/OFF) ––
×TCS fail signal (ON/OFF) status is
displayed.
ABS FAIL SIG
(ON/OFF) ––
×ABS fail signal (ON/OFF) status is
displayed.
EBD FAIL SIG
(ON/OFF) ––
×EBD fail signal (ON/OFF) status is
displayed.
FLUID LEV SW
(ON/OFF) ×
– ×Brake fluid level switch (ON/OFF)
status is displayed.
EBD SIGNAL
(ON/OFF) ––
×EBD operation (ON/OFF) status is
displayed.
ABS SIGNAL
(ON/OFF) ––
×ABS operation (ON/OFF) status is
displayed.
TCS SIGNAL
(ON/OFF) ––
×TCS operation (ON/OFF) status is
displayed.
VDC SIGNAL
(ON/OFF) ––
×VDC operation (ON/OFF) status is
displayed.
EBD WARN LAMP ––×Brake warning lamp (ON/OFF) sta-
tus is displayed.
SLCT LVR POSI ××× Shift position judged by PNP switch
signal.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU

TROUBLE DIAGNOSISBRC-35
[VDC/TCS/ABS]
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Revision: November 2009 2006 QX56
×: Applicable
– : Not applicable
ACTIVE TEST
CAUTION:

Do not perform active test while driving.

Make sure to completely bleed air from the brake system.

The ABS and brake (EBD) warning lamps turn on during the active test.
R POSI SIG ––× Shift position judged by PNP switch
signal.
4WD FAIL REQ ––× The state of 4WD controller is dis-
played by CAN communication sig-
nal.
2WD/4WD ––× It recognizes on software whether it
is 2WD and whether it is in 4WD
state.
BST OPER SIG ––× Active booster operation (ON/OFF)
status is displayed.
PRESS SENSOR ×–×Brake pressure detected by pres-
sure sensor is displayed.
CRANKING SIG ––× The input state of the key SW
START position signal is displayed.
PRESS SEN 2 ––× Brake pressure detected by pres-
sure sensor is displayed.
DELTA S SEN ––× The amount of stroke sensor move-
ments in the active booster
detected by DELTA S SEN is dis-
played.
RELEASE SW NO ––× Release switch signal (ON/OFF)
status is displayed. "ON" indicates
that the brake pedal is depressed.
"OFF" is that the brake pedal is
released.
RELEASE SW NC ––× Release switch signal (ON/OFF)
status is displayed. "OFF" indi-
cates that the brake pedal is
depressed on. "ON" is that the
brake pedal is released.
OHB FAIL ––× OHB fail status is displayed.
HBA FAIL ––× HBA fail status is displayed.
OHB SIG ––× OHB operation (ON/OFF) status is
displayed.
HBA SIG ––× HBA operation (ON/OFF) status is
displayed.
PRES CTRL ACC ––× Pressure control state (ON/OFF) is
displayed. It is applied only to an
ICC vehicle.
PRES FAIL ACC ––× Pressure control fail state (ON/
OFF) is displayed. It is applied only
to an ICC vehicle.
STP OFF RLY ––× Stop lamp relay signal (ON/OFF)
status is displayed.
Item
(Unit) Data monitor item selection
Remarks
ECU INPUT
SIGNALS MAIN
SIGNALS SELECTION
FROM MENU

CO-22Revision: November 2009
THERMOSTAT AND WATER PIPING
2006 QX56
CAUTION:
Perform when the engine is cold.
2. Remove the air duct and resonator assembly. Refer to EM-15, "
Removal and Installation" .
3. Remove the engine room cover using power tool.
4. Disconnect the heater hose (heater core side).
5. Remove the heater hose bracket.
6. Disconnect the water cut valve connector.
7. Remove the water cut valve.
INSPECTION AFTER REMOVAL

Place a thread so that it is caught in the valve of the thermostat.
Immerse fully in a container filled with water. Heat while stirring.

The valve opening temperature is the temperature at which the
valve opens and falls from the thread.

Continue heating. Check the full-open lift amount.

After checking the full-open lift amount, lower the water temper-
ature and check the valve closing temperature.
Standard values:
INSTALLATION
Installation is in the reverse order of removal.
Installation of Thermostat

Install the thermostat with the whole circumference of each
flange part fit securely inside the rubber ring as shown.

Install the thermostat with the jiggle valve facing upwards.
Installation of Water Outlet Pipe and Heater Pipe
First apply a neutral detergent to the O-rings, then quickly insert the insertion parts of the water outlet pipe and
heater pipe into the installation holes.
INSPECTION AFTER INSTALLATION

Check for leaks of the engine coolant. Refer to CO-10, "CHECKING COOLING SYSTEM FOR LEAKS" .

Start and warm up the engine. Visually check for leaks of the engine coolant.
SLC252B
Thermostat
Valve opening temperature 80 - 84°C (176 - 183° F)
Full-open lift amount More than 10 mm/ 95°C (0.39 in/ 203°F)
Valve closing temperature 77°C (171°F) or higher
KBIA2502E