2008 INFINITI QX56 brake sensor

CCS-16
< FUNCTION DIAGNOSIS >
INTELLIGENT CRUISE CONTROL SYSTEM
Component Description
INFOID:0000000001731812
× : Applicable
4. ICC brake hold relay E134 5. ICC sensor E426. ICC brake switch E37
7. Stop lamp switch E38 8. ICC unit B13, B17
(view with luggage side finisher low-
er LH removed)
Component Veh ic le-t o-
vehicle
distance
control mode Conventional
(Fixed speed)
cruise
control mode Brake assist
(With preview function) Description
ICC unit ××× Controls vehicle speed through ECM via CAN commu-
nication.
ICC sensor ××× Measures distance to objects in front of the vehicle and
transmits that information to the ICC unit.
ECM ××× Refer to EC-21, "
System Diagram".
ABS actuator and electric
unit (control unit) ×××
Refer to BRC-18, "
System Description".
Brake pressure sensor ×× Detects brake fluid pressure.
Brake booster ×× Adjusts brake fluid pressure based on command from
ABS actuator and electric unit (control unit).
BCM × Transmits front wiper request signal to ICC sensor inte-
grated unit through CAN communication.
TCM ×× Refer to TM-20, "
TCM Function".
Revision: March 2010 2008 QX56

CCS-20
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (ICC SENSOR INTEGRATED UNIT)
BRAKE SW
[On/Off] ××
Indicates [On/Off] status as judged from ICC brake switch signal (ECM trans-
mits ICC brake switch signal through CAN communication).
STOP LAMP SW
[On/Off] ××Indicates [On/Off] status as judged from stop lamp switch signal (ECM trans-
mits stop lamp switch signal through CAN communication).
CRUISE LAMP
[On/Off] ××
Indicates [On/Off] status of MAIN switch indicator lamp output.
CLUTCH SW SIG
[On/Off] ××
NOTE:
This item is displayed, but cannot monitor.
NP SW SIG
[On/Off] ××Indicates [On/Off] status as judged from transmission range switch signal
(ECM transmits transmission range switch signal through CAN communica-
tion).
STP LMP DRIVE
[On/Off] ××
Indicates [On/Off] status of ICC brake hold relay drive output.
PWR SUP MONI
[V] ××
Indicates IGN voltage input by ICC sensor integrated unit.
IDLE SW
[On/Off] ×Indicates [On/Off] status of idle switch read from ICC sensor integrated unit
through CAN communication (ECM transmits On/Off status through CAN
communication).
OWN VHCL
[On/Off] ×
Indicates [On/Off] status of own vehicle indicator output.
VHCL AHEAD
[On/Off] ×
Indicates [On/Off] status of vehicle ahead detection indicator output.
ICC WARNING
[On/Off] ×
Indicates [On/Off] status of ICC system warning lamp output.
BUZZER O/P
[On/Off] ×
Indicates [On/Off] status of ICC warning chime output.
ENGINE RPM
[rpm] ×Indicates engine speed read from ICC sensor integrated unit through CAN
communication (ECM transmits engine speed through CAN communication).
WIPER SW
[OFF/LOW/HIGH] ×
Indicates wiper [OFF/LOW/HIGH] status (BCM transmits front wiper request
signal through CAN communication).
YAW R AT E
[deg/s] ×NOTE:
This item is displayed, but cannot monitor.
D RANGE SW
[On/Off] ×Indicates [On/Off] status of “D” or “DS” or “M” positions read from ICC sensor
integrated unit through CAN communication; ON when position “D” or “DS” or
“M” (TCM transmits shift position indicator lamp signal through CAN commu-
nication).
NP RANGE SW
[On/Off] ×Indicates shift position indicator lamp signal read from ICC sensor integrated
unit through CAN communication (TCM transmits shift position indicator lamp
signal through CAN communication).
VHCL SPD AT
[km/h] or [mph] ×Indicates vehicle speed calculated from A/T vehicle speed sensor read from
ICC sensor integrated unit through CAN communication (TCM transmits A/T
vehicle speed sensor signal through CAN communication).
GEAR
[1, 2, 3, 4, 5] ×Indicates A/T gear position read from ICC sensor integrated unit through CAN
communication (TCM transmits current gear position signal through CAN
communication).
MODE SIG
[OFF, ICC, ASCD] ×Indicates the active mode from ICC or ASCD [conventional (fixed speed)
cruise control mode].
SET DISP IND
[On/Off] ×
Indicates [On/Off] status of SET switch indicator output.
DISTANCE
[m] ×
Indica
t

es the distance from the vehicle ahead.
RELATIVE SPD
[m/s] ×
Indicates the relative speed of the vehicle ahead.
Monitored Item [unit]
MAIN
SIGNALS SELECTION
FROM
MENU Description
Revision: March 2010
2008 QX56

CCS
DIAGNOSIS SYSTEM (ICC SENSOR INTEGRATED UNIT)
CCS-21
< FUNCTION DIAGNOSIS >
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ACTIVE TEST
NOTE:
• Never perform the active test while driving.
• “Active Test” cannot be started while ICC system warning lamp illuminates.
ECU IDENTIFICATION
Displays the part number of t he ICC sensor integrated unit.
Active test item Function
ICC BUZZER Activates/deactivates the ICC buzzer.
METER LAMP Turns ON/OFF the MAIN switch indicator and ICC system warning lamp.
NOTE:
Start the engine and perform active test.
STOP LAMP Drives the ICC brake hold relay and turns ON/OFF the stop lamp.
Revision: March 2010 2008 QX56

CCS
ICC UNITCCS-55
< ECU DIAGNOSIS >
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Diagnostic Trouble Code (DTC) ChartINFOID:0000000001757410
× :Applicable
DTC
No. CONSULT-III screen terms ICC sys-
tem
warning lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Veh ic le-
to-vehi-cle dis-
tance
control mode Conven-
tional
(fixed
speed) cruise
control mode Brake as-
sist (with
preview
function)
11 CONTROL UNIT ×××× • ICC unit internal malfunctionCCS-22
12 VDC CONTROL UNIT ×××× • VDC malfunction
• Brake booster signal harness is
open or shorted CCS-23
20 CAN COMM CIRCUIT
×××× • ICC unit detected CAN communi-
cation malfunction CCS-24
31 POWER SUPPLY CIR1
×××× • ICC unit power supply voltage is
excessively low (less than 8V) CCS-25
34 POWER SUPPLY CIR2
×××× • ICC unit power supply voltage is
excessively high. CCS-25
41 VHCL SPEED SE CIRC
×××× • Wheel sensor malfunction
• ABS actuator and electric unit
(control unit) malfunction
• A/T vehicle speed sensor mal-
function
•TCM malfunction CCS-26
43 VDC/TCS/ABS CIRC
×××× • VDC/TCS/ABS system malfunc-
tion CCS-27
45 BRAKE SW/ STOP L SW
×××× • ICC brake switch or stop lamp
switch harness is open or shorted
• ICC brake switch or stop lamp switch is stuck to OFF
• ICC brake switch or stop lamp switch is stuck to ON CCS-28
46 OPERATION SW CIRC
××× • ICC steering switch harness or
spiral cable is open or shorted
• ICC steering switch malfunction CCS-30
74 LASER BEAM OFF CNTR
××ו Laser beam of ICC sensor is off
the aiming point CCS-31
90 STOP LAMP RLY FIX
××ו Normally open terminal of stop
lamp relay is stuck CCS-32
92 ECM CIRCUIT
×××× •ECM malfunction
• Accelerator pedal position sensor
malfunction
• ICC unit malfunction CCS-37
96 NP RANGE
××× • Transmission range switch har-
ness is open or shorted
• Transmission range switch mal- function
•TCM malfunction CCS-38
97 AT CIRCUIT
××× •TCM malfunctionCCS-39
98 GEAR POSITION ××× •TCM malfunction
• A/T input speed sensor malfunc-
tion
• A/T vehicle speed sensor mal- function CCS-40
Revision: March 2010
2008 QX56

CCS-56
< ECU DIAGNOSIS >
ICC UNIT
NOTE: DTC 55 will display when no malfunction is detected.102 LASER STAIN
××ו ICC sensor body window has
contamination CCS-41
103 LASER SENSOR FAIL
×× × • ICC sensor internal malfunctionCCS-42
104 LASER AIMING INCMP ×× × • Laser beam aiming of ICC sensor
is not adjusted CCS-43
107 LASER COMM FAIL
×× × • CAN data received by ICC sensor
is strange (from ICC unit, combi-
nation meter or ECM) CCS-44
109 LASER HIGH TEMP
×× × • Temperature around ICC sensor
is excessively high CCS-45
DTC
No. CONSULT-III screen terms ICC sys-
tem
warning lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Vehicle-
to-vehi-cle dis-
tance
control mode Conven-
tional
(fixed
speed) cruise
control mode Brake as-
sist (with
preview
function)
Revision: March 2010 2008 QX56

CCS-66
< SYMPTOM DIAGNOSIS >
NORMAL OPERATING CONDITION
NORMAL OPERATING CONDITION
DescriptionINFOID:0000000001731913
PRECAUTIONS FOR VEHICLE-TO-VEHICLE DISTANCE CONTROL MODE
• Intelligent Cruise Control is functionally limited. This never support careless driving and low visibility (rain,fog, etc.). Drive the vehicle safely. Keep a safe di stance between vehicles by decreasing the vehicle speed
according to the driving condition etc.
• Intelligent Cruise Control never stop the vehicle autom atically. Intelligent Cruise Control is automatically
released, and the buzzer sounds if any vehicle ahead is not detected when the vehicle speed is approxi-
mately 35 km (21.5 MPH) or less.
• Use this system when the vehicle speed does not extr emely change. This system may not properly function
when any vehicle cuts in, or when the vehicle ahead s uddenly applies the brake. Then, the warning (buzzer
and indication) activates.
• Never use Intelligent Cruise Control in the following conditions.
- A well-trafficed road, and a tight turn. It may cause any accident because the dr iving does not fit to the road condition.
- A slippery road (e.g., freezing, or snowy road) The vehicle may lose the control by wheelspin.
- The vehicle drives in bad whet her (rain, fog, snow etc.).
The distance from the vehicle ahead is not detected pr ecisely if the whether condition is bad. Intelligent
Cruise Control is released automatically if the wiper activates in low or high speed.
- The vehicle receives bright light (sunshine etc.). The distance from the vehicle ahead is not detected pr ecisely if bright light enters in the vehicle.
- Raindrop or snow is on the sensor.
The distance from the vehicle ahead is not detected prec isely if raindrop or snow attaches on the sensor.
- A steep downhill The setting vehicle speed may exceed if Intelligent Cruise Control does not detect the vehicle ahead. The
brake may heat up in the vehicle- to-vehicle distance control mode.
- A repeated uphill and downhill Intelligent Cruise Control may not detect the vehicl e ahead precisely. An accident may occur by tailgating.
- Maintaining proper vehicle distance is difficult due to frequent acceleration/deceleration. It may cause any accident because the driving does not fit to the road condition if keeping a proper vehicle-
to-vehicle distance is difficult.
- When entering in the highway interchange (swerving off the main line),
Unexpected accident may cause if the vehicle ahead drives slower
than the preset vehicle speed. T he vehicle-to-vehicle distance con-
trol mode accelerates automatically because the vehicle ahead is
not detected on the lane if the own vehicle or the vehicle ahead
changes the lane.
• Intelligent Cruise Control does not activate to the parking vehicles, and vehicles driving extremely slow er than the own vehicle. Never
hit the vehicle stopping at a tollgate, or the tail end of traffic jam.
• Intelligent Cruise Control does not activate to the vehicle edging way, and non-vehicle objects (passengers etc.).
• This function detects the reflector of the vehicle ahead. Intelligent Cruise Control may not detect the vehicle
ahead, and keep a proper vehicle-to-vehicle distance in t he following conditions. Drive the vehicle according
to the driving condition.
- The vehicle ahead installs the reflector higher (trailer etc.).
- The rear of the vehicle ahead is extremely dirt.
- The vehicle ahead or vehicle on other lanes splashes water or snow on the road.
- The vehicle ahead provides dark exhaust gas. Smoke blocks the visibility.
- The vehicle ahead attaches film on the reflector. The v ehicle ahead does not install the reflector. The reflec-
tor is broken.
- Extremely heavy load is on the rear seat or in the cargo area.
- The vehicle drives on a repeated uphill and downhill
EL-2980D
Revision: March 2010 2008 QX56

CCS
NORMAL OPERATING CONDITIONCCS-67
< SYMPTOM DIAGNOSIS >
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• The sensor detection distance is limited if the vehicle-to-vehicle distance is close. The vehicle distance may not maintain properly
because the motorcycle (A) driving on the lane edge is not
detected or detecting the vehicle ahead (cutting in the own vehicle)
delays.
• The sensor dirt is detected automat ically. But it is not perfect. Dirt
is not judged despite the sensor is dirt. Dirt is not detected if snow
or ice is on the sensor.
Keeping the vehicle-to-vehicle distance is difficult. Drive the vehi-
cle safely. Always clean the sensor.
Intelligent Cruise Control is released automatically if dirt is
detected.
• The vehicle ahead may not be detected temporarily, the vehicle or object on the neighboring lane may be
detected or the warning buzzer may sound according to the road shape (curve and narrow road) and the
own vehicle condition (steering, driving lane position, accident , malfunction etc.).
The vehicle ahead is not detected temporarily. The vehicle approaches too close.
PRECAUTIONS FOR CONVENTIONAL (F IXED SPEED) CRUISE CONTROL MODE
• Conventional cruise control mode does neither control the brake nor activate the warning.
Drive the vehicle safely. Keep a safe distance between vehicles by decreasing the vehicle speed according
to the driving condition etc.
• Never use the conventional cruise control mode in the following conditions.
- A well-trafficed road, and a tight turn. It may cause any accident because the driving does not fit to the road condition.
- A slippery road (e.g., freezing, or snowy road) The vehicle may lose the control by wheelspin.
- A steep downhill The engine brake does not activate effectively on a steep downhill. The preset vehicle speed may exceed.
JSOIA0050ZZ
Revision: March 2010 2008 QX56

DLN-80
< ECU DIAGNOSIS >[ATX14B]
TRANSFER CONTROL UNIT
ECU DIAGNOSIS
TRANSFER CONTROL UNIT
Reference ValueINFOID:0000000001737179
VALUE ON THE DIAGNOSIS TOOL
CONSULT-III data monitor item
Monitored item [Unit]
Content ConditionDisplay value
VHCL/S SEN·FR [km/h]
or [mph] Wheel speed (Front
wheel) Vehicle stopped
0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±
10%)
VHCL/S SEN·RR [km/h]
or [mph] Wheel speed (Rear
wheel) Vehicle stopped
0 km/h (0 mph)
Vehicle running
CAUTION:
Check air pressure of tire under standard condition. Approximately
equal to the indica-
tion on speedome-
ter (Inside of
±
10%)
ENGINE SPEED [rpm] Engine speed Engine stopped
(Engine speed: Less than 400 rpm)
0 rpm
Engine running
(Engine speed: 400 rpm or more) Approximately
equal to the indica-
tion on tachometer
THRTL POS SEN [V] Accelerator
pedal posi-
tion (APP) sensor signal
voltage Accelerator pedal: Released
Approx. 0.5V
Accelerator pedal: Fully depressed Approx. 4.0V
FLUID TEMP SE [V] Transfer fluid tempera-
ture signal voltage Transfer fluid temperature approx. 20 - 80
°C (68 - 176 °F) Approx. 1.1 - 0.3V
BATTERY VOLT [V] Power supply voltage for
transfer control unit Ignition switch: ON
Battery voltage
2WD SWITCH [ON/OFF] Input condition from 4WD
shift switch 4WD shift switch: 2WD
ON
4WD shift switch: AUTO, 4H or 4LO OFF
AUTO SWITCH [ON/
OFF] Input condition from 4WD
shift switch 4WD shift switch: AUTO
ON
4WD shift switch: 2WD, 4H or 4LO OFF
LOCK SWITCH [ON/
OFF] Input condition from 4WD
shift switch 4WD shift switch: 4H
ON
4WD shift switch: 2WD, AUTO or 4LO OFF
4L SWITCH [ON/OFF] Input condition from 4WD
shift switch 4WD shift switch: 4LO
ON
4WD shift switch: 2WD, AUTO or 4H OFF
N POSI SW TF [ON/
OFF] Condition of neutral-4LO
switch • Vehicle stopped
• Engine running
• A/T selector lever N posi-
tion
• Brake pedal depressed 4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator mo-
tor is operating.) OFF
→ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.) ON
→OFF
4WD shift switch: 4LO ON
Revision: March 2010 2008 QX56