reset INFINITI QX56 2006 Factory Service Manual

ACS-6
[ICC]
DESCRIPTION
Revision: November 20092006 QX56
DESCRIPTIONPFP:00000
OutlineEKS00BLG
The Intelligent Cruise Control (ICC) system automatically maintains a selected distance from the vehicle
ahead according to that vehicle's speed, or at the set speed, if the road ahead is clear.
The ICC function has two cruise control modes and brake assist (with preview function). The ICC system may
AUTO-CANCEL for various reasons, for example, when the windshield wipers are operating.
VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
Vehicle-to-vehicle distance control mode, the same speed as other vehicles, can be maintained without the
constant need to adjust the operating speed as with a conventional cruise control system.
The system is intended to enhance the operation of the vehicle when following another vehicle in the same
lane and direction.
If the distance sensor detects a slower moving vehicle ahead, the system will reduce speed so that the vehicle
ahead can be followed at the selected distance.
The system automatically controls the throttle and applies the brakes (up to 25% of vehicle braking power) if
necessary.
The detection range of the sensor is approximately 120 m (390 ft) ahead.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
CONVENTIONAL (FIXED SPEED) CRUISE CONTROL MODE
Conventional (fixed speed) cruise control mode is cruising at preset speeds.
Refer to Owner's Manual for Intelligent Cruise Control System operation instructions.
BRAKE ASSIST (WITH PREVIEW FUNCTION)
When the force applied to brake pedal exceeds a certain level, the brake assist is activated and generates a
greater braking force than that of a conventional brake booster, even with light pedal force.
When the preview function identifies the need to apply the sudden brake by sensing the vehicle ahead in the
same lane and the distance and relative speed from it, it applies the brake pre-pressure before driver
depresses the brake pedal and improves brake response by reducing its free play.
Refer to Owner's Manual for Intelligent Cruise Control System operating instructions.
System DiagramEKS00BLH
WKIA1976E

ATC-116
TROUBLE DIAGNOSIS
Revision: November 20092006 QX56
SYSTEM DESCRIPTION
The front air control controls compressor operation based on ambient and intake temperature and a signal
from ECM.
Low Temperature Protection Control
The front air control will turn the compressor ON or OFF as determined by a signal detected by the intake sen-
sor and the ambient sensor.
When intake air temperature is higher than the preset value, the compressor turns ON. The compressor turns
OFF when intake air temperature is lower than the preset value. That preset value is dependent on the ambi-
ent temperature, refer to the following table.
DIAGNOSTIC PROCEDURE FOR MAGNET CLUTCH
SYMPTOM: Magnet clutch does not engage when A/C switch is ON.
1. CHECK INTAKE AND AMBIENT SENSOR CIRCUITS
Check intake and ambient sensors. Refer to AT C - 5 6 , "
A/C System Self-diagnosis Function" .
OK or NG
OK >> GO TO 2.
NG >>

Malfunctioning intake sensor. Refer to ATC-142, "Intake Sensor Circuit" .

Malfunctioning ambient sensor. Refer to ATC-142, "Intake Sensor Circuit" .
Ambient temperature °C (°F)C om pr esso r ON
intake temperature °C ( °F)C o m p r e s s o r O F F
intake temperature ° C (°F)
0 (32) 2.5 (37) 2.0 (36)
10 (50) 2.5 (37) 2.0 (36)
20 (68) 2.5 (37) 1.5 (35)
30 (86) 2.0 (36) 0.5 (33)
40 (104) 2.0 (36)0.5 (33)
50 (122) 2.0 (36)0.5 (33)
WJIA1369E

AV-160
NAVIGATION SYSTEM
Revision: November 20092006 QX56
ROUTE SEARCH
NOTE:
Except for the ordinance-designated cities. (Malfunctioning areas may be changed in the updated map disc.)Symptom
Cause Remedy
No route is shown. No road to be searched is found around the des-
tination. Find wider road (orange road or wider)
nearby and reset the destination and passing
points onto it. Take care of the traveling
direction when there are separate up and
down roads.
Starting point and the destination are too close. Set the destination at more distant point.
Conditional traffic regulation (day of the week/
time of the day) is set at the area around the cur-
rent location or the destination. Turn the time-regulating search conditions
OFF. Turn
“Avoid regulation time” in the
search conditions OFF.
Indicated route is intermittent. In some areas, highways (gray routes) are not used for the search
(Note) Therefore, the route to
the current location or the passing points may be
intermittent. System is not malfunctioning.
When the vehicle has passed the
recommended route, it is deleted
from the screen. A recommended route is controlled by each sec-
tion. When the vehicle has passed the passing
point 1, then the map data from the starting point
up to the passing point 1 will be deleted. (The
data may remain undeleted in some areas.) System is not malfunctioning.
Detouring route is recommended. In some areas, highways (gray routes) are not used for the search. (Note). Therefore, detour
route may be recommended. Set the route closer to the basic route (gray
route).
A detour route may be shown when some traffic
regulation (one-way traffic, etc.) is set at the area
around the starting point or the destination. Slightly move the starting point or the desti-
nation, or set the passing point on the route
of your choice.
In the area where highways (gray routes) are
used for the search, left turn has priority around
the current location and the destination (passing
points). For this reason, the recommended route
may be detouring. System is not malfunctioning.
Landmarks on the map do not
match the actual ones. This can be happen due to omission or error in
the map data. As a rule, an updated map DVD-ROM will be
released once a year. Wait until the latest
map has become available.
Recommended route is far from
the starting point, passing points,
and destination. Starting point, passing points, and destination of
the route guide were set far from the desired
points because route searching data around
these area were not stored. Reset the destination onto the road nearby. If
this road is one of the highways (gray
routes), an ordinary road nearby may be dis-
played as the recommended route.

BCM (BODY CONTROL MODULE)BCS-13
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Revision: November 2009 2006 QX56
WORK SUPPORT
Operation Procedure
1. Touch "BCM" on "SELECT TEST ITEM" screen.
2. Touch "WORK SUPPORT" on "SELECT DIAG MODE" screen.
3. Touch "RESET SETTING VALUE" on "SELECT WORK ITEM" screen.
4. Touch "START".
5. "RESET SETTING VALUE OK?" is displayed, and touch "YES".
6. The setting will be changed and "COMPLETED" will be displayed.
7. Touch "END".
Display Item List
CAN Communication Inspection Using CONSULT-II (Self-Diagnosis)EKS00D80
1. SELF-DIAGNOSTIC RESULT CHECK
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 carry out CAN communication.
1. Connect to CONSULT –II, and select “BCM” on “SELECT SYSTEM ” screen.
2. Select “BCM” on “SELECT TEST ITEM ” screen, and select “SELF-DIAG RESULTS ”.
3. Check display content in self-diagnostic results.
Contents displayed
No malfunction>>Inspection End
Malfunction in CAN communication system>>After printing the monitor items, go to LAN-26, "
CAN COMMU-
NICATION" .
ItemDescription
RESET SETTING VALUE Return a value set with WORK SUPPORT of each system to a default value in factory shipment.
CONSULT-II display code Diagnosis item
U1000 INITIAL DIAG
TRANSMIT DIAG ECM
IPDM E/R
METER/M&A I-KEY

BCS-16
BCM (BODY CONTROL MODULE)
Revision: November 20092006 QX56
8. Configuration of current BCM is printed out automatically. A list-
ing of manual setting items and auto setting items will be dis-
played. Auto setting items are preset and cannot be changed.
Manual setting items can be set by using WRITE CONFIGURA-
TION PROCEDURE. Refer to BCS-16, "
WRITE CONFIGURA-
TION PROCEDURE" .
9. Touch “BACK” on “READ CONFIGURATION ” screen.
WRITE CONFIGURATION PROCEDURE
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.
1. With ignition switch OFF, connect CONSULT-II and CONSULT-II
CONVERTER to data link connector and turn ignition switch ON.
LKIA0504E
LKIA0395E
BBIA0369E

AUTOMATIC BACK DOOR SYSTEMBL-103
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Revision: November 2009 2006 QX56
Auto Back Door Operation Enable Conditions
Control When Operating Enable Conditions Not Met During Power Open/Close
Control When Operating Enable Conditions No Longer Met
Operation Power liftgate switchRemote keyless entry Back door handle switch Back door
close switch
Operating direction Fully closed
→
open Fully open
→
closed Fully closed
→
open Fully open
→ closed Fully closed
→
open Fully open
→
closed Fully open
→
closed
Close
switch CANCEL or NEUTRAL
NEUTRALNEUTRAL
Vehicle stop
condition A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position —A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position —A/T selector
lever in P or N
range and vehi-
cle speed less
than 2 km/h or ignition switch
in OFF position ——
Battery volt-
age Approx. 11V or more
Back door
lock status ————
Unlocked——
Glass hatch Closed
ItemsOperation condition Not met caseControl
A/T selector lever P position P or N position with ignition ON
or any position with ignition
OFFOther
Continue power open or close,
but sounds warning chime.
Back door close switch NEUTRAL CANCEL
Cancels power open/close
operation or door will release to
manual mode.
Voltage drop
11V or more11 > V > 9
9 > V > reset voltage
reset voltage > V
No power function available
Handle switch Normal (GND)Error (OPEN) No operation. Cancel power
open/close release to manual.
Glass hatch ClosedOFF Cancels power door open oper-
ation, door will release to man-
ual mode.
Description
Operation Control
Back door close switch turned to CANCEL Warning chime active
→
Shift to manual mode after full open or
close operation is complete
(Recovery to power mode when main
switch turned OFF or door fully closed) →
Shift to manual mode
A/T selector lever P or N position with igni-
tion switch ON Warning chime active and one-way opera-
tion continuous
(Warning chime inactive and door fully
open or fully closed or operating conditions
recovered)Full open: power close operation allowed
Full close: operating conditions not met
→
no power open function.
Voltage drop 11 - 9V One-way operation continued (equivalent
to the case of starting voltage
← 11 V f o r
handle operation with warning chime
active) Not allowed
Voltage drop less than 9V
(Microcomputer reset voltage - clutch hold
voltage)

Motor stopped

Clutch may slip

Control not possible because microcom-
puter being reset Control not possible because microcom-
puter being reset

REAR SONAR SYSTEMDI-67
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Revision: November 2009 2006 QX56
REQUESTING FAULT CODES MODE
1. While in "requesting number of fault codes" mode, push rear
sonar system OFF switch once.
2. The sonar buzzer will sound once.
3. Rear sonar system OFF indicator will flash and sonar buzzer will sound the first digit of the fault code followed by a one second
pause.
4. Rear sonar system OFF indicator will flash and sonar buzzer will sound the second digit of the fault code followed by a four sec-
ond pause.
5. The fault codes will repeat five times then pause. NOTE:
Requesting fault codes will exit unless the fault code is acknowledged before five repeats ends.
The fault code is acknowledged by pushing the rear sonar system OFF switch once (the sonar buzzer
may sound). When all fault codes have been indicated, idle mode will be entered. See the following table
for fault code identification.
IDLING OR CLEARING FAULT CODES MODE
NOTE:
While in idle mode, self-diagnosis will automatically exit if no activity occurs for thirty seconds.
1. Push and hold rear sonar system OFF switch for three secondsto reset time-out counter.
2. Push and hold rear sonar system OFF switch for three seconds to clear codes.
Fault Code MalfunctionPage Reference
1 1 Rear sonar sensor LH
outer
Check harness for open
or short. If NG repair or
replace harness. If OK
replace sensor. Refer to
DI-70, "
REAR SONAR
SENSORS" .
1 2
Rear sonar sensor LH
inner
1 3 Rear sonar sensor RH
inner
1 4 Rear sonar sensor RH
outer
2 1 Sonar buzzer DI-70, "
SONAR BUZZER"
2 2Rear sonar system OFF
indicator DI-70, "
REAR SONAR
SYSTEM OFF INDICA-
TOR"
2 3
Rear sonar system OFF
switch DI-70, "REAR SONAR
SYSTEM OFF SWITCH"
2 4
Sonar control unit Replace sonar control
unit. Refer to DI-70, "SONAR CONTROL
UNIT"
LKIA0390E
LKIA0391E

EC-24Revision: November 2009
ENGINE CONTROL SYSTEM
2006 QX56
Multiport Fuel Injection (MFI) SystemUBS00KZ7
INPUT/OUTPUT SIGNAL CHART
*1: This sensor is not used to control the engine system. This is used only for the on board diagnosis.
*2: This signal is sent to the ECM through CAN communication line.
*3: ECM determines the start signal status by the signals of engine speed and battery voltage.
SYSTEM DESCRIPTION
The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the length of
time the valve remains open (injection pulse duration). The amount of fuel injected is a program value in the
ECM memory. The program value is preset by engine operating conditions. These conditions are determined
by input signals (for engine speed and intake air) from both the crankshaft position sensor and the mass air
flow sensor.
VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION
In addition, the amount of fuel injected is compensated to improve engine performance under various operat-
ing conditions as listed below.


During warm-up

When starting the engine

During acceleration

Hot-engine operation

When selector lever is changed from N to D

High-load, high-speed operation


During deceleration

During high engine speed operation
Sensor Input signal to ECMECM functionActuator
Crankshaft position sensor (POS) Engine speed*
3
Piston position
Fuel injection
& mixture ratio
controlFuel injector
Camshaft position sensor (PHASE)
Mass air flow sensor
Amount of intake air
Engine coolant temperature sensor Engine coolant temperature
Air fuel ratio (A/F) sensor 1 Density of oxygen in exhaust gas
Throttle position sensor Throttle position
Accelerator pedal position sensor Accelerator pedal position
Park/neutral position (PNP) switch Gear position
Knock sensor Engine knocking condition
Battery Battery voltage*
3
Power steering pressure sensorPower steering operation
Heated oxygen sensor 2 Density of oxygen in exhaust gas*
1
ABS actuator and electric unit (control unit)VDC/TCS operation command*2
Air conditioner switch
Air conditioner operation*2
Wheel sensorVehicle speed*2

EC-66Revision: November 2009
ON BOARD DIAGNOSTIC (OBD) SYSTEM
2006 QX56

When the same malfunction is detected in two consecutive trips, the DTC and the freeze frame data are
stored in the ECM memory, and the MIL will come on. For details, refer to EC-48, "
Two Trip Detection
Logic" .

The MIL will go off after the vehicle is driven 3 times (driving pattern B) with no malfunction. The drive is
counted only when the recorded driving pattern is met (as stored in the ECM). If another malfunction
occurs while counting, the counter will reset.

The DTC and the freeze frame data will be stored until the vehicle is driven 40 times (driving pattern A)
without the same malfunction recurring (except for Misfire and Fuel Injection System). For Misfire and
Fuel Injection System, the DTC and freeze frame data will be stored until the vehicle is driven 80 times
(driving pattern C) without the same malfunction recurring. The “TIME” in “SELF-DIAGNOSTIC
RESULTS ” mode of CONSULT-II will count the number of times the vehicle is driven.

The 1st trip DTC is not displayed when the self-diagnosis results in OK for the 2nd trip.
SUMMARY CHART
For details about patterns B and C under “Fuel Injection System ” and “ Misfire ”, see EC-68, "EXPLANATION FOR DRIVING PATTERNS
FOR “MISFIRE ”, “FUEL INJECTION SYSTEM”" .
For details about patterns A and B under Other, see EC-70, "
EXPLANATION FOR DRIVING PATTERNS EXCEPT FOR “MISFIRE
”, “FUEL INJECTION SYSTEM”" .
*1: Clear timing is at the moment OK is detected.
*2: Clear timing is when the same malfunction is detected in the 2nd trip. Items
Fuel Injection System MisfireOther
MIL (goes off) 3 (pattern B)3 (pattern B) 3 (pattern B)
DTC, Freeze Frame Data (no
display) 80 (pattern C)
80 (pattern C) 40 (pattern A)
1st Trip DTC (clear) 1 (pattern C), *
11 (pattern C), *11 (pattern B)
1st Trip Freeze Frame Data
(clear) *1, *2
*1, *21 (pattern B)

TROUBLE DIAGNOSISEC-121
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EC
Revision: November 2009 2006 QX56VENT CONT/V
[ON/OFF]

The control condition of the EVAP canis-
ter vent control valve (determined by
ECM according to the input signals) is
indicated.
ON: Closed
OFF: Open
THRTL RELAY
[ON/OFF] ×

Indicates the throttle control motor relay
control condition determined by the
ECM according to the input signals.
COOLING FAN
[HI/OFF] ×

The control condition of the cooling fan
(determined by ECM according to the
input signals) is indicated.
HI: High speed operation
OFF: Stop
HO2S2 HTR (B1)
[ON/OFF]

Indicates [ON/OFF] condition of heated
oxygen sensor 2 heater determined by
ECM according to the input signals.
HO2S2 HTR (B2)
[ON/OFF]
I/P PULLY SPD
[rpm]

Indicates the engine speed computed
from the turbine revolution sensor sig-
nal.
VEHICLE SPEED
[km/h] or [MPH]

Indicates the vehicle speed computed
from the revolution sensor signal.
IDL A/V LEARN
[YET/CMPLT]

Display the condition of idle air volume
learning
YET: Idle Air Volume Learning has not
been performed yet.
CMPLT: Idle Air Volume Learning has
already been performed successfully.
TRVL AFTER MIL
[km] or [mile]

Distance traveled while MIL is activated.
A/F S1 HTR (B1)
[%]

A/F sensor 1 heater control value com-
puted by ECM according to the input sig-
nals.

The current flow to the heater becomes
larger as the value increases.
A/F S1 HTR (B2)
[%]
AC PRESS SEN [V]

The signal voltage from the refrigerant
pressure sensor is displayed.
VHCL SPEED SE
[km/h] or [mph]

The vehicle speed computed from the
vehicle speed signal sent from combina-
tion meter is displayed.
SET VHCL SPD*
1
[km/h] or [mph]
The preset vehicle speed is displayed.
MAIN SW
[ON/OFF]

Indicates [ON/OFF] condition from MAIN
switch signal.
CANCEL SW
[ON/OFF]

Indicates [ON/OFF] condition from CAN-
CEL switch signal.
RESUME/ACC SW
[ON/OFF]

Indicates [ON/OFF] condition from
RESUME/ACCELERATE switch signal.
SET SW
[ON/OFF]

Indicates [ON/OFF] condition from SET/
COAST switch signal.
BRAKE SW1
[ON/OFF]

Indicates [ON/OFF] condition from
ASCD brake switch signal.
Monitored item
[Unit] ECM
INPUT
SIGNALS MAIN
SIGNALS Description Remarks