brake sensor INFINITI QX56 2006 Factory Service Manual

ACCELERATOR CONTROL SYSTEMACC-3
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ACC
Revision: November 2009 2006 QX56
ACCELERATOR CONTROL SYSTEMPFP:18005
Removal and InstallationEBS00M3Z
Adjustable Accelerator Pedal
CAUTION:

Do not disassemble the accelerator pedal adjusting mechanism.

Before removal and installation the accelerator and brake pedals must be in the frontmost posi-
tion. This is to align the base position of the accelerator and brake pedals.

Do not disassemble the accelerator pedal assembly.

Do not remove the accelerator pedal position sensor from the accelerator pedal bracket.

Avoid damage from dropping the accelerator pedal assembly during handling.

Keep the accelerator pedal assembly away from water.
REMOVAL
1. Move the accelerator and brake pedals to the frontmost position.
2. Turn the ignition switch OFF and disconnect the negative battery terminal.
3. Disconnect the adjustable brake pedal cable from the adjustable brake pedal.

Unlock, then pull the adjustable brake pedal cable to disconnect it from the adjustable brake pedal.
LBIA0379E
1. Adjustable accelerator pedal assem-
bly 2. A/T control cable mounting bracket (part
of the accelerator pedal assembly) 3. Adjustable pedal electric motor (part
of the accelerator pedal assembly)
4. Adjustable brake pedal cable (part of the accelerator pedal assembly)

ACS-1
AUTO CRUISE CONTROL SYSTEM
K ELECTRICAL
CONTENTS
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ASCD
AUTOMATIC SPEED CONTROL DEVICE (ASCD) ..... 3
Description .......................................................... ..... 3
ICC
PRECAUTIONS ..................................................... ..... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” ............................................................. ..... 4
Precautions for ICC System Service ................... ..... 4
PREPARATION ...................................................... ..... 5
Special Service Tool ............................................ ..... 5
DESCRIPTION ....................................................... ..... 6
Outline ................................................................. ..... 6
VEHICLE-TO-VEHICLE DISTANCE CONTROL
MODE .............................................................. ..... 6
CONVENTIONAL (FIXED SPEED) CRUISE
CONTROL MODE ............................................ ..... 6
BRAKE ASSIST (WITH PREVIEW FUNCTION) ..... 6
System Diagram .................................................. ..... 6
Components Description ..................................... ..... 7
CAN Communication ........................................... ..... 7
SYSTEM DESCRIPTION ................................. ..... 7
Switch Operation ................................................. ..... 7
ICC System Display ............................................ ..... 8
ACTION TEST ....................................................... ..... 9
ICC System Running Test ................................... ..... 9
VEHICLE-TO-VEHICLE DISTANCE CONTROL
MODE .............................................................. ..... 9
CONVENTIONAL (FIXED SPEED) CRUISE
CONTROL MODE ............................................ ... 10
LASER BEAM AIMING ADJUSTMENT ................ ... 12
Outline of Laser Beam Aiming Adjustment Proce-
dure ..................................................................... ... 12
Preparation .......................................................... ... 12
Setting up the ICC Target Board ......................... ... 12
ADJUSTING HEIGHT OF THE TARGET ......... ... 12
ADJUSTING THE POSITION OF THE TARGET
BOARD STRING .............................................. ... 13POSITIONING THE TARGET ..........................
... 13
Sensor Adjustment .............................................. ... 14
CHECK AFTER THE ADJUSTMENT ............... ... 17
ELECTRICAL UNITS LOCATION ......................... ... 18
Component Parts and Harness Connector Location ... 18
WIRING DIAGRAM ................................................ ... 19
Schematic ............................................................ ... 19
Wiring Diagram — ICC — ................................... ... 20
TERMINALS AND REFERENCE VALUE .............. ... 24
Terminals and Reference Values for ICC Unit ..... ... 24
Terminals and Reference Values for ICC Sensor ... 24
TROUBLE DIAGNOSIS — GENERAL DESCRIP-
TION ....................................................................... ... 25
Work Flow ............................................................... 25
CONSULT-II Function (ICC) ................................ ... 26
CONSULT-II OPERATION ................................ ... 26
WORK SUPPORT ............................................ ... 27
SELF-DIAGNOSTIC RESULTS ........................ ... 28
DATA MONITOR .............................................. ... 28
ACTIVE TEST ..................................................... 30
Self-Diagnostic Function ...................................... ... 31
WITH CONSULT-II ........................................... ... 31
WITHOUT CONSULT-II .................................... ... 32
SELF-DIAGNOSIS BY ICC SYSTEM DISPLAY
WILL NOT RUN ................................................ ... 33
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC
ITEMS ..................................................................... ... 36
Diagnostic Trouble Code (DTC) Chart ................ ... 36
DTC 11 CONTROL UNIT .................................... ... 37
DTC 12 VDC CONTROL UNIT ............................ ... 37
DTC 20 CAN COMM CIRCUIT ............................ ... 38
DTC 31 POWER SUPPLY CIR1, DTC 34 POWER
SUPPLY CIR2 ........................................................ 38
DTC 41 VHCL SPEED SE CIRC ......................... ... 39
DTC 43 VDC/TCS/ABS CIRC ............................. ... 39
DTC 45 BRAKE SW/STOP L SW ........................ ... 40
DTC 46 OPERATION SW CIRC .......................... ... 41
DTC 74 LASER BEAM OFF CNTR ..................... ... 42
DTC 90 STOP LAMP RLY FIX ............................... 43
DTC 92 ECM CIRCUIT ........................................ ... 47

ACS-2Revision: November 20092006 QX56
DTC 96 NP RANGE ............................................
... 48
DTC 97 AT CIRCUIT ........................................... ... 48
DTC 98 GEAR POSITION ................................... ... 49
DTC 102 LASER STAIN ...................................... ... 49
DTC 103 LASER SENSOR FAIL ......................... ... 50
DTC 104 LASER AIMING INCMP ....................... ... 50
DTC 107 LASER COMM FAIL ............................. ... 51
DTC 109 LASER HIGH TEMP ............................ ... 51
TROUBLE DIAGNOSIS FOR SYMPTOMS ........... ... 52
Symptom Chart ....................................................... 52
Symptom 1: ON/OFF Switch Does Not Switch ON*
1
, ON/OFF Switch Does Not Switch OFF*
2 ........... ... 53
Symptom 2: The ICC System Cannot Be Set (ON/
OFF Switch Turns On/Off) ................................... ... 53
Symptom 3: The ICC System Cannot Be Operated
by the CANCEL Switch, ACCEL/RES Switch, or
DISTANCE Switch ............................................... ... 54Symptom 4: The ICC System Is Not Cancelled
When the Gear Is in ‘N’ ........................................
... 55
Symptom 5: Chime Does Not Sound ................... ... 55
Symptom 6: Driving Force Is Hunting .................. ... 56
Symptom 7: The ICC System Frequently Cannot
Detect the Vehicle Ahead/The Detection Zone is
Short .................................................................... ... 56
Symptom 8: The System Does Not Detect the Vehi-
cle Ahead at All .................................................... ... 56
ELECTRICAL COMPONENT INSPECTION .......... ... 58
ICC Steering Switch ............................................. ... 58
ICC Brake Switch and Stop Lamp Switch ............ ... 58
Parking Brake Switch ........................................... ... 58
REMOVAL AND INSTALLATION ........................... ... 59
ICC Unit ............................................................... ... 59
ICC Sensor .......................................................... ... 59
ICC Steering Switch ............................................. ... 59

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

DESCRIPTIONACS-7
[ICC]
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Components DescriptionEKS00BLI
CAN CommunicationEKS00BLJ
SYSTEM DESCRIPTION
Refer to LAN-26, "CAN COMMUNICATION" .
Switch OperationEKS00BLK
The system is operated by a master ON/OFF switch and four control switches, all mounted on the steering
wheel.
Component Vehicle-to-vehicle
distance control mode Conventional
(fixed speed)
cruise control mode Brake assist
(with preview brake) Description
ICC unit ××× Controls vehicle speed through ECM via CAN
communication.
ICC sensor ×× Irradiate laser beam, and receives reflected
laser beam to measure distance from preceding
vehicle.
ECM ××× Transmits throttle position signal and ICC steer-
ing switch signal to ICC unit.
ABS actuator and electric
unit (control unit) ××× Transmits wheel speed signal to ICC unit.
Operates brake booster based on CAN commu-
nication.
Brake pressure sensor ×× Detects fluid pressure in master cylinder.
Brake booster ×× Adjusts brake fluid pressure based on command
from ABS actuator and electric unit (control
unit).
BCM × Transmit front wiper request signal to ICC unit.
TCM ×× Transmits gear position signal and output shaft
revolution signal to ICC unit.
No.
Switch name Description
1 ACCEL/RES switch Resumes set speed or increases speed incrementally.
2 COAST/SET switch Sets desired cruise speed, reduces speed incrementally.
3 ON/OFF switch Master switch to activate the system.
SKIA5973E

ACS-12
[ICC]
LASER BEAM AIMING ADJUSTMENT
Revision: November 20092006 QX56
LASER BEAM AIMING ADJUSTMENTPFP:00026
Outline of Laser Beam Aiming Adjustment ProcedureEKS00BLN
CAUTION:

The laser beam aiming adjustment cannot be performed without CONSULT-II.

The laser beam aiming adjustment must be performed every time the ICC sensor is removed,
installed or has been moved as a result of a collision.
1. Prepare the vehicle and the work area.
2. Set up the ICC target board. For details, refer to Technical Service Bulletin.
3. Adjust the sensor following the procedure on CONSULT-II.
4. Check system operation after the adjustment.
PreparationEKS00BLO

Place the vehicle on level ground. Shift the transmission into "P" position and release the parking brake.

Adjust the tire pressure to the specified value.

See that there is no load in the vehicle. Coolant, engine oil and fuel should be filled to correct level.

Check that the vehicle suspension has been adjusted to the standard height by the load leveling rear air
suspension system. Refer to RSU-12, "
Basic Inspection" .

Clean the sensor with a soft cloth.
Setting up the ICC Target BoardEKS00BLP
CAUTION:
Accuracy in setting up the ICC target board is essential for the laser beam aiming adjustment.
For details, refer to Technical Service Bulletin.
ADJUSTING HEIGHT OF THE TARGET
1. Attach a triangle scale as shown.Tool number : KV99110100 (J-45718)
LKIA0632E
WKIA1849E

ACS-24
[ICC]
TERMINALS AND REFERENCE VALUE
Revision: November 20092006 QX56
TERMINALS AND REFERENCE VALUEPFP:00000
Terminals and Reference Values for ICC UnitEKS00BLU
Terminals and Reference Values for ICC SensorEKS00BLV
Te r m i n a lWire
color Item Condition
Voltage (V)
(Approx.)
Ignition
switch Operation
1W/L Battery power supply OFF— Battery voltage
2W/L
5 P CAN-L —— —
7 B/R N-P RANGE ON A/T selector lever in "P" or "N"Battery voltage
10 V/R Brake booster signal ON—
14 L CAN-H —— —
19 B Ground
ON——
20 B
29 BR/W ICC brake switch
(normally closed) Selector
lever: Not in “N ” or “P ”
position Depress the brake
pedal
0
Release the brake
pedal Battery voltage
30 L DDL-TX —— —
33 R/B Ignition switch power supply ON —
Battery voltage
38 R/G Stop lamp switch
(normally open)
OFFDepress the brake pedal
Release the brake pedal
0
39 V/W DDL-RX —— —
40 G Parking brake signal
ONParking brake is ON
0
Parking brake is OFF Battery voltage
42 R/B Ignition switch power supply —Battery voltage
46 B Ground ——
47 BR Stop lamp drive output signal Brake operating with ICC system
Battery voltage
Brake not operating with ICC
system 0
SKIA1243E
TerminalWire
color Item Condition
Voltage (V)
Ignition
switch Operation
1 R/B Ignition switch power supply
ON—
Battery voltage
2 L CAN-H ——
3 P CAN-L ——
4 B Ground ——

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-27
[ICC]
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Revision: November 2009 2006 QX56
6. Touch “WORK SUPPORT ”, “SELF-DIAG RESULTS ”, “DATA
MONITOR ”, "CAN DIAG SUPPORT MNTR", “ACTIVE TEST” or
“ECU PART NUMBER ” on selection screen.
WORK SUPPORT
Work Item
Cause of Auto-Cancel
1. Touch “WORK SUPPORT ” on "SELECT DIAG MODE" screen.
2. Touch “CAUSE OF AUTO-CANCEL ” on "SELECT WORK ITEM"
screen.
3. Cause of automatic cancellation screen will be shown.
4. The last five causes of automatic cancellation of ICC system will be displayed.
Possible Causes of "Auto-Cancel"
Laser Beam Adjust
For details, refer to ACS-12, "LASER BEAM AIMING ADJUSTMENT" .
BCIA0031E
Operation Function
CAUSE OF AUTO-CANCEL Indicates causes of automatic cancellation of the ICC system.
LASER BEAM ADJUST Outputs laser beam, calculates dislocation of the beam, and indicates adjustment direction.
SKIA6191E
Cause of cancellation Description
OPERATING WIPER Windshield wipers were operated at HI or LO speed operation.
OPERATING ABS ABS function was operated.
OPERATING TCS TCS function was operated.
OPERATING VDC VDC function was operated.
ECM CIRCUIT ECM did not permit ICC operation.
OPE SW VOLT CIRC Voltage outside the standard was detected.
LASER SUN BEAM Intense light such as sunlight entered ICC sensor light sensing part.
LASER TEMP Temperature around ICC sensor became low.
WHL SPD ELEC NOISE Wheel speed sensor signal caught electromagnetic noise.
OP SW DOUBLE TOUCH ICC steering switches were pressed at the same time.
VDC/TCS OFF SW VDC OFF switch was pressed.
WHEEL SPD UNMATCH Wheel speed became different from AT vehicle speed.
TIRE SLIP Wheel slipped.
PKB SW ON Parking brake is applied.
IGN LOW VOLT Power supply voltage became low.
NO RECORD —

TROUBLE DIAGNOSIS — GENERAL DESCRIPTIONACS-29
[ICC]
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BRAKE SW
[ON/OFF]××× Indicates [ON/OFF] status as judged from
ICC brake switch signal.
STOP LAMP SW
[ON/OFF] ×××
Indicates [ON/OFF] status as judged from
stop lamp switch signal.
RELEASE SW NO
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
ON when brake is depressed.
OFF when brake is not depressed.
RELEASE SW NC
[ON/OFF] ××Indicates [ON/OFF] status as judged from
release switch signal.
OFF when brake is depressed.
ON when brake is not depressed.
IDLE SW
[ON/OFF] ××Indicates [ON/OFF] status of idle switch
read by ICC unit via CAN communication
(ECM transmits ON/OFF status via CAN
communication).
GEAR
[1, 2, 3, 4, 5] ××Indicates A/T gear position read by ICC unit
via CAN communication (TCM transmits
gear position via CAN communication).
BUZZER O/P
[ON/OFF] ×Indicates [ON/OFF] status of ICC warning
output.
ICC WARNING ×NOTE:
This item is displayed but cannot be moni-
tored.
VHCL SPD AT
[km/h] or [mph] ×Indicates vehicle speed calculated from A/T
vehicle speed sensor by ICC unit via CAN
communication (TCM transmits A/T vehicle
speed sensor signal via CAN communica-
tion).
PRESS SENS
[bar] ××× Indicates brake fluid pressure value calcu-
lated from signal voltage of pressure sen-
sor.
PRESS SENS 2
[bar] ××NOTE:
This item is displayed but cannot be moni-
tored.
D RANGE SW
[ON/OFF] ××Indicates [ON/OFF] status of
“D ” position
read by ICC unit via CAN communication
(TCM transmits ON/OFF condition of “ D”
position via CAN communication).
A/T OD OFF
[ON/OFF] ×
Indicates [ON/OFF] status of OD cancel
output under control.
NP RANGE SW
[ON/OFF] ××Indicates PNP switch signal read by ICC
unit via CAN communication. (TCM trans-
mits PNP switch signal via CAN communi-
cation)
DISTANCE ×NOTE:
This item is displayed but cannot be moni-
tored.
RELATIVE SPD ×NOTE:
This item is displayed but cannot be moni-
tored.
STP LMP DRIVE
[ON/OFF] ×× Indicates [ON/OFF] status of brake hold
relay drive output.
Monitored Item [unit] MAIN SIGNALS
ECU
INPUT
SIGNALS SELECTION
FROM MENU Description

ACS-36
[ICC]
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
Revision: November 20092006 QX56
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMSPFP:00000
Diagnostic Trouble Code (DTC) ChartEKS00BLZ
×:Applicable
DTC No. CONSULT-II screen terms ICC sys-
tem
warning
lamp Fail-safe
Malfunctions detected where... Refer-
ence
page
Ve h ic le -
to-vehi-cle dis-
tance
control mode Conven-
tional
(fixed
speed) cruise
control mode Brake
assist
(with pre- view
function)
11 CONTROL UNIT ××××

ICC unit internal malfunctionACS-37
12 VDC CONTROL UNIT ××××

VDC malfunction

Brake booster signal harness is
open or shortedACS-37
20 CAN COMM CIRCUIT
××××
ICC unit detected CAN communi-
cation malfunctionACS-38
31 POWER SUPPLY CIR1
××××
ICC unit power supply voltage is
excessively low (less than 8V)ACS-38
34 POWER SUPPLY CIR2
××××
ICC unit power supply voltage is
excessively high.ACS-38
41 VHCL SPEED SE CIRC
××××

Wheel sensor malfunction

ABS actuator and electric unit
(control unit) malfunction

A/T vehicle speed sensor mal-
function

TCM malfunctionACS-39
43 VDC/TCS/ABS CIRC
××××
VDC/TCS/ABS system malfunc-
tionACS-39
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 ONACS-40
46 OPERATION SW CIRC
×××

ICC steering switch harness or
spiral cable is open or shorted

ICC steering switch malfunctionACS-41
74 LASER BEAM OFF CNTR
×××
Laser beam of ICC sensor is off
the aiming point ACS-42
90 STOP LAMP RLY FIX
×××
Normally open terminal of stop
lamp relay is stuck ACS-43
92 ECM CIRCUIT
××××

ECM malfunction

Accelerator pedal position sensor
malfunction

ICC unit malfunctionACS-47
96 NP RANGE
×××

Park/neutral position switch har-
ness is open or shorted

Park/neutral position switch mal-
function

TCM malfunctionACS-48
97 AT CIRCUIT
×××
TCM malfunctionACS-48