Infiniti QX4. Electrical System (2003 year). Manual

ASCD ACTUATOR/PUMP CHECK

=NBEL0375S08

CHECK VACUUM HOSE

Check vacuum hose (between ASCD actuator and ASCD pump) for breakage, cracks or fracture.

MEL402G

OK or NG

䊳

GO TO 2.

䊳

Repair or replace hose.

CHECK ASCD WIRE

Check wire for improper installation, rust formation or breaks.

OK or NG

䊳

GO TO 3.

䊳

Repair or replace wire. Refer to “ASCD Wire Adjustment” (EL-280).

CHECK ASCD ACTUATOR

1. Disconnect vacuum hose from ASCD actuator.
2. Connect the hose of hand vacuum pump to ASCD actuator.

SEL264W

OK or NG

䊳

GO TO 4.

䊳

Replace ASCD actuator.

IDX

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Trouble Diagnoses (Cont’d)

EL-277

CHECK ASCD PUMP

1. Disconnect vacuum hose from ASCD pump and ASCD pump connector.
2. If necessary remove ASCD pump.
3. Connect vacuum gauge to ASCD pump.
4. Apply 12V direct current to ASCD pump and check operation.

SEL265WB

OK or NG

䊳

INSPECTION END

䊳

Replace ASCD pump.

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Trouble Diagnoses (Cont’d)

EL-278

SEL803Y

Electrical Component Inspection

=NBEL0376

ASCD BRAKE SWITCH AND STOP LAMP SWITCH

NBEL0376S01

Condition

Continuity

ASCD brake

switch

Stop lamp switch

When brake pedal is depressed

Yes

When brake pedal is released

Yes

Check each switch after adjusting brake pedal — refer to BR-12,
“BRAKE PEDAL AND BRACKET”.

SEL303XA

PARK/NEUTRAL POSITION SWITCH

NBEL0376S02

A/T selector lever position

Continuity

Between terminals 1 and 2

“P”

Yes

“N”

Yes

Except “P” and “N”

IDX

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Electrical Component Inspection

EL-279

ASCD Wire Adjustment

=NBEL0377

MEL383K

CAUTION:

쐌

Be careful not to twist ASCD wire when removing it.

쐌

Do not tense ASCD wire excessively during adjustment.

Adjust the tension of ASCD wire in the following manner.
1.

Loosen lock nut and adjusting nut.

Make sure that accelerator wire is properly adjusted. Refer to
FE-3, “ACCELERATOR CONTROL SYSTEM”.

Tighten adjusting nut just until throttle drum starts to move.

Loosen adjusting nut again 1/2 to 1 turn.

Tighten lock nut.

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

ASCD Wire Adjustment

EL-280

Precautions

NBEL0458

PRECAUTIONS FOR ICC SYSTEM SERVICE

NBEL0458S02

쐌

Do not look straight into the laser beam discharger when
adjusting laser beam aiming.

쐌

Turn the ON/OFF switch OFF in conditions similar to driving,
suchlike Free rollers or a chassis dynamometer.

쐌

not

use

the

ICC

sensor

removing

from

vehicle,

disassemble, or remodel the sensor.

쐌

Erase DTCs when replacing parts of ICC system, then check
the operation of ICC system after adjusting laser beam aiming
if necessary.

PRECAUTIONS FOR CAN SYSTEM SERVICE

NBEL0458S04

쐌

Do not apply voltage of 7.0V or higher to the measurement
terminals.

쐌

Use the tester with its open terminal voltage being 7.0V or less.

PKIA0306E

쐌

Solder the repaired parts, and wrap with tape. [Frays of twisted
line must be within 110 mm (4.33 in)]

Preparation

NBEL0459

SPECIAL SERVICE TOOL

NBEL0459S01

The actual shapes of Kent-Moore tools may differ from those of special service tools illusttated here.

Tool number
(Kent-Moore No.)
Tool name

Description

KV99110100
(J-45718)
ICC target board

PKIA0358J

Laser beam aiming adjustment

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Precautions

EL-281

Description

NBEL0460

OUTLINE

NBEL0460S01

The Intelligent Cruise Control (ICC) system automatically maintains
a selected distance from the vehicle ahead according to that vehi-
cle’s speed, or at the set speed, if the road ahead is clear.
With ICC, the same speed as other vehicles can be maintained
without the constant need to adjust the operating speed as with a
normal 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 390 ft (120 m)
ahead.
Refer to Owner’s Manual for Intelligent Cruise Control System
operating instructions.

SYSTEM DIAGRAM

NBEL0460S02

SEL501Y

COMPONENTS DESCRIPTION

NBEL0460S03

Component

Description

ICC unit

Operates ASCD actuator and brake booster based on that sensor signals and CAN commu-
nication data, then controls vehicle distance.

ICC sensor

Irradiate laser beam, and receives reflected laser beam to measure distance from preceding
vehicle.

ECM

Transmits throttle angle signal to ICC unit.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Description

EL-282

Component

Description

Brake pressure sensor

Detects fluid pressure in master cylinder.

ASCD actuator

Based on command from ICC unit, adjust throttle valve angle with ASCD actuator, using
vacuum emerged from vacuum pump.

Brake booster

Adjusts brake fluid pressure, based on command from ICC unit.

ABS actuator and electrical unit

ABS operation signal to ICC unit.

SKIA1203E

SWITCH OPERATION

NBEL0460S05

The system is operated by a master ON/OFF switch and four con-
trol switches, all mounted on the steering wheel

No.

Switch name

Description

ON/OFF switch

Master switch to activate the system

COAST/SET switch

Sets desired cruise speed, reduces speed incrementally

ACCELERATE/RESUME switch

Resumes set speed or increases speed incrementally

CANCEL switch

Deactivates system without erasing set speed

DISTANCE switch

Changes the following distance from: Maximum, Intermediate, Minimum

SEL502Y

ICC SYSTEM DISPLAY

NBEL0460S06

No.

Component

Description

Intelligent cruise control system warning
lamp (Orange)

The light comes on if there is a malfunction in the ICC system.

Vehicle ahead detection indicator

Indicates whether it detects a vehicle ahead.

Set distance indicator

Display the selected distance between vehicles set with the DISTANCE
switch.

Own vehicle indicator

Indicates the base vehicle.

ON/OFF switch indicater lamp (White)

Indicates that the ON/OFF switch is ON.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Description (Cont’d)

EL-283

No.

Component

Description

Set vehicle speed indicator

Indicates the set vehicle speed.

Action Test

NBEL0461

ICC SYSTEM RUNNING TEST

NBEL0461S01

ICC System Set Checking

NBEL0461S0101

Turn on the ON/OFF switch.

Drive the vehicle at 40 km/h (25 MPH) to 144 km/h (90 MPH).

Push the COAST/SET switch.

Confirm that the desired speed is set as hand is released from
the COAST/SET switch.

NOTE:

쐌

When there is no vehicle ahead, drive at the set speed steadily.

쐌

When there is a vehicle ahead, control to maintain distance
from the vehicle ahead, watching its speed.

쐌

The set vehicle speed is displayed on the ICC system indica-
tor in the combination meters.

Check for Increase of The Cruising Speed

NBEL0461S0102

Set the ICC at desired speed.

Check if the set speed increases by 1.6 km (1 MPH) as
COAST/SET switch is pushed.

NOTE:
The maximum set speed of the ICC system is 144 km/h (90 MPH).

Check for Decrease of The Cruising Speed

NBEL0461S0103

Set the ICC at desired speed.

Check if the set speed decreases by 1.6 km/h (1 MPH) as
COAST/SET switch is pushed.

NOTE:

쐌

ICC system is automatically turned off when the driving speed
lowers to 32 km/h (20 MPH) due to the deceleration of the
vehicle ahead.

쐌

The lowest set speed is 40 km/h (25 MPH).

Check for The Cancellation of ICC System (Normal
Driving Condition) in The Following Cases:

NBEL0461S0104

When the brake pedal is depressed after the system is turned
on.

When the select lever is shifted into other than “D” including
manual shift.

When the ON/OFF switch is turned off.

When CANCEL switch is operated.

Check for Restoring The Speed That is Set by ICC
System Before ICC Cancellation

NBEL0461S0105

Cancel the system by depressing the foot brake.Then, check
that the speed before cancellation is restored when pressing
ACCEL/RES switch with 40 km/h (25 MPH) or above.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Description (Cont’d)

EL-284

Cancel the system by shifting the select lever into other than
“D”, Then, check if the speed set before the cancellation is
restored when ACCEL/ RES switch is pressed.

Check if the speed previously set is restored when ACCEL/
RES switch is operated with driving 40 km/h (25 MPH), after
canceling the ICC by operating the CANCEL switch.

SEL503Y

Check for ON/OFF Switch

NBEL0461S0106

Start the engine.Then, check the following operations are car-
ried correctly.

Intelligent Cruise Control (ICC) system is displayed in between
the

tachometer

and

speedometer

illuminates

when

ON/OFFswitch is ON and ready for operation.The illumination
goes off when ON/OFF switch is turned to OFF.

“CRUISE” illumination and “ICC” system illumination go off
when the key switch is turned to OFF while ON/OFFswitch is
ON (“CRUISE” illumination is ON and ICC system is ready for
operation).

Check for ACCEL/RES, COAST/SET, CANCEL Switches

NBEL0461S0107

Check if ACCEL/ RES, COAST/SET, CANCEL switches are
operated smoothly.

Check if buttons come up as hand is released from the buttons.

Check for Distance Switch

NBEL0461S0108

Start the engine.

Turn on the ON/OFF switch.

Press the DISTANCE switch.

Check if the set distance indicator changes display in order of:
(long)

(medium)

(short).

NOTE:
The set distance indicator shows ’long’ immediately after the
engine starts.

SEL504Y

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Action Test (Cont’d)

EL-285

Laser Beam Aiming Adjustment

NBEL0462

OUTLINE

NBEL0462S01

Adjust the laser beam aiming every time the ICC sensor is removed
or installed.

CAUTION:

쐌

Place the vehicle on the level ground when the laser beam
aiming adjustment is operated.

쐌

Follow the CONSULT-II when adjusting the Laser beam
aiming (Laser beam aiming adjustment cannot be oper-
ated without CONSULT-II).

PREPARATION

NBEL0462S02

쐌

Keep all tires inflated to correct pressures. Adjust the tire pres-
sure to the specified pressure value.

쐌

See that there is no-load in vehicle other than the driver (or
equivalent weight placed in driver’s position). Coolant, engine
oil filled up to correct level and full fuel tank.

쐌

Shift the gear into “P” position and release the parking brake.

SEL505Y

쐌

Clean the sensor with a soft cloth.

OUTLINE OF ADJUSTMENT PROCEDURE

NBEL0462S03

Set up the ICC target board [KV99110100 (J-45718)].

Adjust the sensor following the procedure on CONSULT-II
(Turn manually the screw for up-down position adjustment.
ICC sensor automatically adjust the right-left position).

SETTING THE ICC TARGET BOARD

NBEL0462S04

Accurate ICC target board setting is required for the laser beam
aiming adjustment.

CAUTION:

ICC system does not function normally if laser beam aiming
is not accurate.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment

EL-286

SEL506Y

Adjusting Height of The Target

NBEL0462S0401

Attach a triangle scale as shown in the figure.

SEL507Y

Adjust the height of the target stand so that the point of the tri-
angle aims the center of the ICC sensor.

SKIA1211E

Adjusting The Right-left Position of The Target

NBEL0462S0402

Attach a scale [at least 300 mm (12 in) or longer] or stick as
shown in the figure.

SEL508Y

Suspend a thread with weight on the tip of the thread to 254
mm (10 in) left side of the target board from the center of the
target board on top.

Setting The Target

NBEL0462S0403

Suspend a thread with weight on tip to splice the center of the
front and back bumpers. Then, mark the center point on the
ground as each weight points.

Link the front and back bumpers’ center points marked on the
ground, and mark a point 5 m ahead of the vehicle, on the
extended line of the previous link line of the bumper center
points.Then, adjust the position of the target board so that the
weight come on the top of the marked point (5 m ahead of the
vehicle) and face to the vehicle.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment (Cont’d)

EL-287

SKIA1213E

Adjust the position of the target board so that the extended line
that links the center of the rear windshield and the center of the
front windshield align with the weight suspended from the
board.

Remove the thread suspended to the left side of board and
suspend a thread with weight on tip on the center of the target
board. Then mark the point of weight on the ground.

SKIA1214E

Pivot the edge of the target board 20-degree to either side.

NOTE:
50 mm (1.97 in) shift rates the 20-degree movement.

SEL509Y

Do not place anything in the space shown in the figure (view
from top).

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment (Cont’d)

EL-288

SKIA1216E

NOTE:
In case the space shown in the illustration is not available, make
space by covering the side of the target board with a 400 mm
(15.75 in)-size frosted black board or black cloth.

AIMING ADJUSTMENT

NBEL0462S05

CAUTION:

Complete all necessary work for laser beam adjustment until
the adjustment completes as shown in the procedure. If the
procedure does not complete, the ICC system is inoperative.
1.

Turn ignition switch OFF.

SEL670Y

Connect “CONSULT-II” and “CONSULT-II CONVERTER” to
the data link connector. Then, start the engine, wait for at least
10 sec., and touch “START”.

SKIA3098E

Turn ignition switch “ON”.

Touch “START (NISSAN BASED VHCL)”.

SEL510Y

Touch “ICC”.
If “ICC” is not indicated, go to GI-42, “CONSULT-II Data Link
Connector (DLC) Circuit”.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment (Cont’d)

EL-289

SKIA1218E

Touch “WORK SUPPORT”.

SKIA1219E

Touch “LASER BEAM ADJUST”.

SKIA1220E

Touch “START”.

CAUTION:

If the adjustment screen does not appear on CONSULT-II 10
sec. after touching “LASER BEAM ADJUST” screen, the fol-
lowing causes may be considered:

쐌

Target is not set accurately.

쐌

There is not enough space beside the target.

쐌

Deformation of vehicle or the surrounding equipment unit,
bracket, or the surrounding equipment is causing inappro-
priate installation of sensor and aiming may be set out of
the adjustable range.

쐌

The area is not suitable for the adjustment work.

쐌

ICC sensor is not clean.

쐌

Laser beam adjustment may not be processed if some-
thing interrupts the laser beam.

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment (Cont’d)

EL-290

SKIA1221E

SEL511Y

After the CONSULT-II displays “ADJUST THE VERTICAL OF
LASER” turn the up-down direction adjustment screw until
“U/D CORRECT” value is set in the range of

CAUTION:

Turn the screw slowly. The value change on display is slower
than actual movement of the ICC sensor. Wait for 2 seconds
every time the screw is turned half a rotation.
NOTE:
Turning the screw to the right lifts the aiming and to the left lowers
the aiming.

SKIA1223E

10. When “U/D CORRECT” value indicates

4, confirm that the

margin of value remains within

4 at least for 2 seconds with

no equipment or hand touching the ICC sensor.
When “COMPLETED THE VERTICAL AIMING OF LASER
BEAM” appears on screen, touch “END”.

CAUTION:

Be sure that the margin of “U/D CORRECT” is within

4 with

ICC sensor unit is untouched.

SKIA1224E

11. Confirm

that

“ADJUSTING

AUTOMATIC

HORIZONTAL

LASER BEAM AIMING” is on screen and wait for a while
(maximum: 10 sec.).

SKIA1225E

12. Confirm that “NORMALLY COMPLETED” is displayed on

CONSULT-II and close the aiming adjustment procedure by
touching “END”.

CAUTION:

Complete all the procedures once “LASER BEAM ADJUST”
mode is entered in CONSULT-II. When the procedure is
discontinued, the ICC system is inoperable.

IDX

INTELLIGENT CRUISE CONTROL (ICC) SYSTEM

Laser Beam Aiming Adjustment (Cont’d)

EL-291

Infiniti QX4. Electrical System (2003 year). Manual - part 18