Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti Q45 FY33 F50 2001-2006 Approved 2006_Q45 scs
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SUSPENSION CONTROL SYSTEM
E SUSPENSION
A
SUSPENSION CONTROL SYSTEM
SECTION SCS B
C
D
SCS
CONTENTS
PRECAUTIONS ......................................................... 3
. SELF-DIAGNOSTIC PROCEDURE (WITH F
Precautions for Supplemental Restraint System CONSULT-II) ...................................................... 28
.
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- SELF-DIAGNOSTIC PROCEDURE (WITHOUT
SIONER" ................................................................. 3
. CONSULT-II) ...................................................... 28
. G
Precautions ............................................................. 3
. ERASE SELF-DIAGNOSIS ................................ 29 .
ACTIVE DAMPER SUSPENSION SYSTEM ............. 4 . Inspections Before Trouble Diagnosis ................... 29 .
Cross-Section View ................................................. 4
. Trouble Diagnosis Chart for Symptoms ................. 29 .
H
System Description ................................................. 4
. TROUBLE DIAGNOSIS FOR SYSTEM ................... 30 .
DESCRIPTION ..................................................... 4
. Power Supply Circuit ............................................. 30
.
ACTIVE DAMPER SUSPENSION ....................... 5 . ACTIVE DAMPER SUSPENSION CONTROL
VERTICAL G SENSOR ........................................ 5 . UNIT TERMINALS AND REFERENCE VALUE... 30 I
STEERING ANGLE SENSOR ............................. 5 . DIAGNOSTIC PROCEDURE ............................. 31 .
SHOCK ABSORBER ACTUATOR ....................... 5 . Vehicle Speed Sensor (VEHICLE SPEED SEN) ... 32
SHOCK ABSORBER ........................................... 5 . CONSULT-II REFERENCE VALUE IN DATA J
ACTIVE DAMPER SUSPENSION SELECT MONITOR MODE ............................................... 32.
SWITCH ............................................................... 5
. ACTIVE DAMPER SUSPENSION CONTROL
SPORT INDICATOR LAMP .................................. 5 . UNIT TERMINALS AND REFERENCE VALUE... 32
K
CONTROL UNIT .................................................. 6 . DIAGNOSTIC PROCEDURE ............................. 33 .
System Diagram ...................................................... 6
. Steering Angle Sensor (STEERING ANGLE SEN) 34 ...
COMPONENTS FUNCTION DESCRIPTION ...... 6 . CONSULT-II REFERENCE VALUE IN DATA
TROUBLE DIAGNOSIS ............................................. 7 . MONITOR MODE ............................................... 34. L
Fail-Safe Function ................................................... 7
. ACTIVE DAMPER SUSPENSION CONTROL
How to Perform Trouble Diagnosis ......................... 7 . UNIT TERMINALS AND REFERENCE VALUE... 35
BASIC CONCEPT ................................................ 7 . DIAGNOSTIC PROCEDURE ............................. 35 . M
Component Parts Location ...................................... 8 . Vertical G Sensor (VERTI G SENSOR) ................. 37 .
Circuit Diagram ....................................................... 9
. CONSULT-II REFERENCE VALUE IN DATA
Wiring Diagram -- ACTIVE -- .............................. 10 . MONITOR MODE ............................................... 37.
Active Damper Suspension Control Unit Input/Out- ACTIVE DAMPER SUSPENSION CONTROL
put Signal Reference Values ................................. 20 . UNIT TERMINALS AND REFERENCE VALUE... 37
ACTIVE DAMPER SUSPENSION CONTROL DIAGNOSTIC PROCEDURE ............................. 37 .
UNIT INSPECTION TABLE ................................ 20 . Shock Absorber Actuator ....................................... 41
.
CONSULT-II Function (ACT D/SUS) ..................... 23 . CONSULT-II REFERENCE VALUE IN DATA
FUNCTION ......................................................... 23
. MONITOR MODE ............................................... 41.
CONSULT-II SETTING PROCEDURE ............... 23 . ACTIVE DAMPER SUSPENSION CONTROL
SELF-DIAG RESULT MODE ............................. 24 . UNIT TERMINALS AND REFERENCE VALUE... 41
DATA MONITOR MODE .................................... 25 . DIAGNOSTIC PROCEDURE ............................. 42 .
ACTIVE TEST MODE ........................................ 26 . Engine Speed Signal ............................................. 47
.
ACTIVE DAMPER SUSPENSION CONTROL CONSULT-II REFERENCE VALUE IN DATA
UNIT PART NUMBER MODE ............................ 27 . MONITOR MODE ............................................... 47.
Self-Diagnostic Procedure .................................... 28 . ACTIVE DAMPER SUSPENSION CONTROL
Revision: 2005 November SCS-1 2006 Q45
UNIT TERMINALS AND REFERENCE VALUE... 47 SWITCH ..............................................................55
.
DIAGNOSTIC PROCEDURE ............................. 47 . TROUBLE DIAGNOSIS FOR SYMPTOMS .............56 .
Active Damper Suspension Select Switch ............. 49 . Hard or Soft Feel ....................................................56
.
CONSULT-II REFERENCE VALUE IN DATA SYMPTOM: .........................................................56.
MONITOR MODE ............................................... 49
. DIAGNOSTIC PROCEDURE ..............................56 .
ACTIVE DAMPER SUSPENSION CONTROL Active Damper Suspension Select Switch Does Not
UNIT TERMINALS AND REFERENCE VALUE... 49 Change ..................................................................58
.
DIAGNOSTIC PROCEDURE ............................. 50 . SYMPTOM: .........................................................58.
Stop Lamp Switch .................................................. 52
. DIAGNOSTIC PROCEDURE ..............................58 .
CONSULT-II REFERENCE VALUE IN DATA CONTROL UNIT .......................................................60 .
MONITOR MODE ............................................... 52
. Removal and Installation ........................................60 .
ACTIVE DAMPER SUSPENSION CONTROL REMOVAL ...........................................................60
.
UNIT TERMINALS AND REFERENCE VALUE... 52 INSTALLATION ...................................................60 .
DIAGNOSTIC PROCEDURE ............................. 52 . G SENSOR ...............................................................61
.
Component Inspection ........................................... 54
. Removal and Installation ........................................61 .
VERTICAL G SENSOR ...................................... 54 . REMOVAL ...........................................................61
.
SHOCK ABSORBER ACTUATOR ..................... 54 . INSTALLATION ...................................................61 .
ACTIVE DAMPER SUSPENSION SELECT
Revision: 2005 November SCS-2 2006 Q45
PRECAUTIONS
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NES000AG
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front C
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WARNING: D
q To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death
in the event of a collision which would result in air bag inflation, all maintenance must be per-
formed by an authorized NISSAN/INFINITI dealer. SCS
q Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
q Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
G
Precautions NES000AH
q Before connecting or disconnecting the active damper sus-
pension control unit harness connector, turn ignition H
switch "OFF" and disconnect the battery cable from the
negative terminal. Battery voltage is applied to active
damper suspension control unit even if ignition switch is I
turned "OFF".
J
SEF289H
K
q When connecting or disconnecting pin connectors into or
from active damper suspension control unit, take care not
to damage pin terminals (bend or break). L
When connecting pin connectors make sure that there are
not any bends or breaks on active damper suspension con-
trol unit pin terminals.
M
SEF291H
q Before replacing active damper suspension control unit,
perform active damper suspension control unit input/out-
put signal inspection and make sure whether active damper
suspension control unit functions properly or not. Refer to
SCS-20, "Active Damper Suspension Control Unit Input/
Output Signal Reference Values" .
SDIA1848E
Revision: 2005 November SCS-3 2006 Q45
ACTIVE DAMPER SUSPENSION SYSTEM
ACTIVE DAMPER SUSPENSION SYSTEM PFP:28500
Cross-Section View NES000B0
SEIA0700E
1. Shock absorber actuator 2. Control rod 3. Spool
4. Retainer 5. Oil flow inlet (extension side) 6. Main valve (extension side)
7. Check valve (extension side) 8. Nut 9. Collar
10. Oil flow inlet (compression side) 11. Main valve (compression side) 12. Check valve (compression side)
13. Stud
System Description NES000I5
DESCRIPTION
q It controls the damping force of shock absorber in real time according to the driving conditions.
q Skyhook control is used to active damper suspension.
Skyhook Control
q Method of controlling the damping force of shock absorber on the actual vehicle just like the shock
absorber supported at an aerial point that has an effect on the vehicle body.
NOTE:
As the damping force of shock absorber does not have an effect on the wheel side movement, the force
from the road is not transmitted to the vehicle body.
q Only when the vehicle body itself is moved up/down with the roll caused by the starting/brake/steering
operations will the damping force of shock absorber certainly act to control the vehicle body.
Revision: 2005 November SCS-4 2006 Q45
ACTIVE DAMPER SUSPENSION SYSTEM
ACTIVE DAMPER SUSPENSION
Operation Principle A
B
C
D
SEIA0701E
Extension side: hard
SCS
q The oil groove of spool is closed.
q The oil flowed from the extension side oil flow inlet via the extension side main valve. The oil flow amount
is minimized, and the damping force of shock absorber rises.
F
Compression side: hard
q The oil groove of spool is closed.
q The oil flowed from the compression side oil flow inlet via the compression side main valve. The oil flow G
amount is minimized, and the damping force of shock absorber rises.
Extension side: soft
q The oil grooves of spool and stud are open. H
q The oil flowed through 2 passages (one passage is from the extension side oil flow inlet via the extension
side main valve and another passes the oil groove of spool via the extension side check valve). Therefore,
the oil flow amount is maximized, and the damping force of shock absorber will weaken.
I
Compression side: soft
q The oil grooves of spool and stud are open
q The oil flowed through 2 passages (one passage is from the compression side oil flow inlet via the com- J
pression side main valve and another passes the oil groove of spool via the compression side check
valve). Therefore, the oil flow amount is maximized, and the damping force of shock absorber will weaken.
VERTICAL G SENSOR K
It detects the upper/lower acceleration applied to the vehicle body (front/rear).
STEERING ANGLE SENSOR
L
It detects the steering wheel angle.
SHOCK ABSORBER ACTUATOR
It rotates the spool, opens/closes the oil passage of stud (changes the flow amount), and then controls the M
damping force of shock absorber.
SHOCK ABSORBER
It continuously switches the damping force at the wide range in a short time and can control the damping
forces of extension side and compression side individually.
ACTIVE DAMPER SUSPENSION SELECT SWITCH
AUTO (normal driving) mode and SPORT (sports driving) mode can be changed. When selecting the SPORT
mode, SPORT indicator in combination meter illuminates.
SPORT INDICATOR LAMP
q SPORT indicator lamp in combination meter is illuminated (SPORT mode) or turned off (AUTO mode) by
switching the active damper suspension select switch, and it indicates the modes.
q It indicates a system malfunction (when the fail-safe function is activated) and the self-diagnostic results
by turning on or blinking.
Revision: 2005 November SCS-5 2006 Q45
ACTIVE DAMPER SUSPENSION SYSTEM
CONTROL UNIT
q The active damper suspension control unit (1) calculates the
direction or speed of the vehicle body by the input signal from
each sensor, and it controls the actuator to optimize the damp-
ing force of shock absorber.
q Self-diagnosis can be done.
SEIA0703E
System Diagram NES000AL
SEIA0731E
COMPONENTS FUNCTION DESCRIPTION
Component parts Function
Active damper suspension con-
Controls shock absorber actuator. (with fail-safe function)
trol unit
Detects the upper/lower acceleration applied to the vehicle body (front) and sends the output signal
Front vertical G sensor
to the active damper suspension control unit.
Detects the upper/lower acceleration applied to the vehicle body (rear) and sends the output signal
Rear vertical G sensor
to the active damper suspension control unit.
Detects the steering wheel angle and sends the output signal to the active damper suspension con-
Steering angle sensor
trol unit.
Controls the damping force of shock absorber by the output signal from the active damper suspen-
Actuator
sion control unit.
Active damper suspension
Able to select from AUTO or SPORT mode.
select switch
SPORT indicator lamp Indicates that active damper suspension system is under SPORT mode.
Transmits conditions of engine speed signal via CAN communication to active damper suspension
ECM
control unit.
Transmits conditions of vehicle speed signal via CAN communication to active damper suspension
Combination meter
control unit.
Revision: 2005 November SCS-6 2006 Q45
TROUBLE DIAGNOSIS
TROUBLE DIAGNOSIS PFP:00004
A
Fail-Safe Function NES000AM
If a malfunction occurs in each input/output signal and electrical system, the output signal of active damper
suspension control unit controls the actuator and keeps the damping power of shock absorber constant. B
How to Perform Trouble Diagnosis NES000AN
BASIC CONCEPT
q To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con- C
trol and mechanism) thoroughly.
q It is also important to clarify customer complaints before inspec-
tion. D
First of all, reproduce symptoms, and understand them fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with SCS
customer.
CAUTION:
Customers are not professional. It is dangerous to make an
F
easy guess like "maybe the customer means that...," or
"maybe the customer mentions this symptom".
SEF233G
G
q It is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on H
interview with customer and past examples. Do not perform
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with- I
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.
q After completing diagnosis, always erase diagnostic memory. J
Refer to SCS-29, "ERASE SELF-DIAGNOSIS" . SEF234G
q For intermittent malfunctions, move harness or harness connec-
tor by hand. Then check for poor contact or reproduced open circuit. K
L
M
Revision: 2005 November SCS-7 2006 Q45
TROUBLE DIAGNOSIS
Component Parts Location NES000AO
SEIA0704E
Revision: 2005 November SCS-8 2006 Q45
TROUBLE DIAGNOSIS
Circuit Diagram NES000AP
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0134E
Revision: 2005 November SCS-9 2006 Q45
TROUBLE DIAGNOSIS
Wiring Diagram -- ACTIVE -- NES000B1
TEWM0126E
Revision: 2005 November SCS-10 2006 Q45
TROUBLE DIAGNOSIS
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0135E
Revision: 2005 November SCS-11 2006 Q45
TROUBLE DIAGNOSIS
TEWM0127E
Revision: 2005 November SCS-12 2006 Q45
TROUBLE DIAGNOSIS
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0140E
Revision: 2005 November SCS-13 2006 Q45
TROUBLE DIAGNOSIS
TEWM0128E
Revision: 2005 November SCS-14 2006 Q45
TROUBLE DIAGNOSIS
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0136E
Revision: 2005 November SCS-15 2006 Q45
TROUBLE DIAGNOSIS
TEWM0137E
Revision: 2005 November SCS-16 2006 Q45
TROUBLE DIAGNOSIS
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0129E
Revision: 2005 November SCS-17 2006 Q45
TROUBLE DIAGNOSIS
TEWM0138E
Revision: 2005 November SCS-18 2006 Q45
TROUBLE DIAGNOSIS
A
B
C
D
SCS
F
G
H
I
J
K
L
M
TEWM0139E
Revision: 2005 November SCS-19 2006 Q45
TROUBLE DIAGNOSIS
Active Damper Suspension Control Unit Input/Output Signal Reference Values
NES000AQ
ACTIVE DAMPER SUSPENSION CONTROL UNIT INSPECTION TABLE
Specifications with CONSULT-II
Monitor item [Unit] Content Condition Display value
Vehicle stopped 0 km/h (0 MPH)
Approximately
VHCL SPEED SE [km/h] Vehicle running equal to the indica-
Vehicle speed
or [mph] CAUTION: tion on speedome-
Check air pressure of tire under standard condition. ter (Inside of
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