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stc

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STEERING CONTROL SYSTEM

G STEERING

SECTION
STEERING CONTROL SYSTEM
STC B

E
CONTENTS
WITHOUT REAR ACTIVE STEER CONSULT-II) ...................................................... 14. F
ERASE SELF-DIAGNOSIS ................................ 15 .
PRECAUTIONS ......................................................... 4
. Inspections before Trouble Diagnosis ................... 16 .
Precautions for Supplemental Restraint System Trouble Diagnosis Chart for Symptoms ................. 16 . STC
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TROUBLE DIAGNOSIS FOR SYSTEM ................... 17 .
SIONER" ................................................................. 4
. Power Supply Circuit ............................................. 17 .
Precautions ............................................................. 4
. ACTIVE DAMPER SUSPENSION CONTROL
ELECTRICALLY CONTROLLED POWER STEER- H
UNIT TERMINALS AND REFERENCE VALUE... 17
ING SYSTEM ............................................................. 5
. DIAGNOSTIC PROCEDURE ............................. 18 .
Power Steering Control Diagram ............................. 5 . Vehicle Speed Sensor (VEHICLE SPEED SEN) ... 19
Operation Principle .................................................. 5
. CONSULT-II REFERENCE VALUE IN DATA I
DURING PARKING (WHEN TURNING THE MONITOR MODE ............................................... 19 .
STEERING WHEEL TO THE RIGHT.) ................. 5 . ACTIVE DAMPER SUSPENSION CONTROL
DURING HIGH-SPEED OPERATION .................. 6 . UNIT TERMINALS AND REFERENCE VALUE... 19 J
System Description ................................................. 6
. DIAGNOSTIC PROCEDURE ............................. 20 .
DESCRIPTION ..................................................... 6
. Power Steering Solenoid Valve ............................. 21 .
POWER STEERING SOLENOID VALVE ............. 6 . CONSULT-II REFERENCE VALUE IN DATA
CONTROL UNIT .................................................. 6 . K
MONITOR MODE ............................................... 21 .
System Diagram ...................................................... 7
. ACTIVE DAMPER SUSPENSION CONTROL
COMPONENTS FUNCTION DESCRIPTION ...... 7 . UNIT TERMINALS AND REFERENCE VALUE... 21
TROUBLE DIAGNOSIS ............................................. 8 . DIAGNOSTIC PROCEDURE ............................. 22 . L
Fail-Safe Function ................................................... 8
. Engine Speed Signal ............................................. 24 .
FAIL-SAFE INPUT CONDITIONS ........................ 8 . CONSULT-II REFERENCE VALUE IN DATA
How to Perform Trouble Diagnosis ......................... 8 . MONITOR MODE ............................................... 24 . M
BASIC CONCEPT ................................................ 8 . ACTIVE DAMPER SUSPENSION CONTROL
Component Parts Location ...................................... 9 . UNIT TERMINALS AND REFERENCE VALUE... 24
Wiring Diagram -- EPS -- .................................... 10 . DIAGNOSTIC PROCEDURE ............................. 24 .
Active Damper Suspension Control Unit Input/Out- Component Inspection ........................................... 27 .
put Signal Reference Values ................................. 12 . POWER STEERING SOLENOID VALVE ........... 27 .
ACTIVE DAMPER SUSPENSION CONTROL TROUBLE DIAGNOSIS FOR SYMPTOMS ............. 28 .
UNIT INSPECTION TABLE ................................ 12 . Hard Steering When Fully Turning the Steering
CONSULT-II Function (ACT D/SUS) ..................... 13 . Wheel .................................................................... 28
.
FUNCTION ......................................................... 13
. DIAGNOSTIC PROCEDURE ............................. 28 .
CONSULT-II SETTING PROCEDURE ............... 13 . Light Steering When Driving at a High Speed ....... 29 .
SELF-DIAG RESULT MODE ............................. 13 . DIAGNOSTIC PROCEDURE ............................. 29 .
DATA MONITOR MODE .................................... 14 . CONTROL UNIT ...................................................... 30 .
Self-Diagnostic Procedure .................................... 14 . Removal and Installation ....................................... 30 .
SELF-DIAGNOSTIC PROCEDURE (WITH REMOVAL .......................................................... 30.
CONSULT-II) ...................................................... 14
. INSTALLATION .................................................. 30 .
SELF-DIAGNOSTIC PROCEDURE (WITHOUT

Revision: 2005 November STC-1 2006 Q45
WITH REAR ACTIVE STEER SELF-DIAGNOSTIC PROCEDURE (WITHOUT
CONSULT-II) .......................................................53
.
PRECAUTIONS ........................................................ 31 . ERASE SELF-DIAGNOSIS .................................54 .
Precautions for Supplemental Restraint System Inspections before Trouble Diagnosis ....................55 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Trouble Diagnosis Chart for Symptoms .................55 .
SIONER" ................................................................ 31
. TROUBLE DIAGNOSIS FOR SYSTEM ...................56 .
Precautions ............................................................ 31
. DTC C1900, C1901, C1905, C1906, C1907,
Precautions for RAS Actuator Assembly and Rear C1908, C1922, C1927, C1928 CONTROL UNIT ...56
Wheel Steering Angle Sensor Replacement ......... 32 . DIAGNOSTIC PROCEDURE ..............................56 .
ELECTRICALLY CONTROLLED POWER STEER- DTC C1925 AD CONVERTER ..............................56 .
ING ........................................................................... 33
. DTC C1902, C1903, C1904, C1910, C1913
Power Steering Control Diagram ........................... 33 . MOTOR OUTPUT ..................................................57 .
Operation Principle ................................................ 33 . CONSULT-II REFERENCE VALUE IN DATA
DURING PARKING (WHEN TURNING THE MONITOR MODE ...............................................57 .
STEERING WHEEL TO THE RIGHT.) ............... 33 . RAS CONTROL UNIT TERMINALS AND REF-
DURING HIGH-SPEED OPERATION ................ 34 . ERENCE VALUE ................................................57 .
System Description ................................................ 34 . DIAGNOSTIC PROCEDURE ..............................58 .
DESCRIPTION ................................................... 34 . DTC C1909 CONTROL UNIT ................................60 .
POWER STEERING SOLENOID VALVE ........... 34 . CONSULT-II REFERENCE VALUE IN DATA
CONTROL UNIT ................................................. 34 . MONITOR MODE ...............................................60 .
System Diagram .................................................... 35 . RAS CONTROL UNIT TERMINALS AND REF-
COMPONENTS FUNCTION DESCRIPTION ..... 35 . ERENCE VALUE ................................................60 .
CAN Communication ............................................. 35 . DIAGNOSTIC PROCEDURE ..............................60 .
SYSTEM DESCRIPTION ................................... 35 . DTC C1911, C1912 MOTOR VOLTAGE ................62 .
REAR ACTIVE STEER SYSTEM ............................. 36 . CONSULT-II REFERENCE VALUE IN DATA
Power Steering Control Diagram ........................... 36 . MONITOR MODE ...............................................62 .
Operation Principle ................................................ 36 . RAS CONTROL UNIT TERMINALS AND REF-
OPERATION PRINCIPLE ................................... 36 . ERENCE VALUE ................................................62 .
System Description ................................................ 37 . DIAGNOSTIC PROCEDURE ..............................62 .
DESCRIPTION ................................................... 37 . DTC C1914, C1915, C1916, C1917, C1918 RR ST
RAS ACTUATOR ASSEMBLY ............................ 37 . ANGLE SENSOR ...................................................67.
STEERING ANGLE SENSOR ............................ 37 . CONSULT-II REFERENCE VALUE IN DATA
REAR WHEEL STEERING ANGLE SENSOR ... 37 MONITOR MODE ...............................................67 .
CONTROL UNIT ................................................. 38 . RAS CONTROL UNIT TERMINALS AND REF-
RAS WARNING LAMP ....................................... 38 . ERENCE VALUE ................................................67 .
System Diagram .................................................... 38 . DIAGNOSTIC PROCEDURE ..............................68 .
COMPONENTS FUNCTION DESCRIPTION ..... 39 . DTC C1919 VEHICLE SPEED SEN ......................72 .
CAN Communication ............................................. 39 . DIAGNOSTIC PROCEDURE ..............................72 .
SYSTEM DESCRIPTION ................................... 39 . DTC C1920, C1923, C1924, C1926 STEERING
TROUBLE DIAGNOSIS ........................................... 40 . ANGLE SEN ..........................................................72
.
Fail-Safe Function ................................................. 40 . DIAGNOSTIC PROCEDURE ..............................72 .
How to Perform Trouble Diagnosis ........................ 40 . DTC C1921 ENG REV SIGNAL .............................73 .
BASIC CONCEPT .............................................. 40 . DIAGNOSTIC PROCEDURE ..............................73 .
Component Parts Location .................................... 41 . DTC C1929 VDC ...................................................74
.
Circuit Diagram ...................................................... 42 . DIAGNOSTIC PROCEDURE ..............................74 .
Wiring Diagram -- RAS -- .................................... 43 . DTC U1000 CAN COMM .......................................75 .
RAS Control Unit Input/Output Signal Reference DIAGNOSTIC PROCEDURE ..............................75 .
Values .................................................................... 47
. DTC U1010 CONTROL UNIT (CAN) .....................75 .
RAS CONTROL UNIT INSPECTION TABLE ..... 47 . DIAGNOSTIC PROCEDURE ..............................75 .
CONSULT-II Function (RAS/HICAS) ..................... 49 . RAS Actuator Assembly .........................................76 .
FUNCTION ......................................................... 49 . DIAGNOSTIC PROCEDURE ..............................76 .
CONSULT-II SETTING PROCEDURE ............... 49 . Power Steering Solenoid Valve ..............................77 .
SELF-DIAG RESULT MODE .............................. 49 . CONSULT-II REFERENCE VALUE IN DATA
DATA MONITOR MODE ..................................... 51 . MONITOR MODE ...............................................77 .
ACTIVE TEST MODE ......................................... 52 . RAS CONTROL UNIT TERMINALS AND REF-
RAS CONTROL UNIT PART NUMBER MODE ... 53 ERENCE VALUE ................................................77 .
Self-Diagnostic Procedure ..................................... 53 . DIAGNOSTIC PROCEDURE ..............................78 .
SELF-DIAGNOSTIC PROCEDURE (WITH Stop Lamp Switch ..................................................80
.
CONSULT-II) ...................................................... 53 . CONSULT-II REFERENCE VALUE IN DATA

Revision: 2005 November STC-2 2006 Q45
MONITOR MODE .............................................. 80. Wheel .................................................................... 88
.
RAS CONTROL UNIT TERMINALS AND REF- DIAGNOSTIC PROCEDURE ............................. 88 . A
ERENCE VALUE ................................................ 80
. Light Steering When Driving at a High Speed ....... 89 .
DIAGNOSTIC PROCEDURE ............................. 80 . DIAGNOSTIC PROCEDURE ............................. 89 .
Component Inspection .......................................... 82
. CONTROL UNIT ...................................................... 90 . B
RAS MOTOR ..................................................... 82
. Removal and Installation ....................................... 90 .
RAS MOTOR RELAY ......................................... 82 . REMOVAL .......................................................... 90.
NOISE SUPPRESSOR ...................................... 83 . INSTALLATION .................................................. 90 .
REAR WHEEL STEERING ANGLE SENSOR ... 83 REAR ACTIVE STEER ............................................ 91 . C
POWER STEERING SOLENOID VALVE ........... 84 . Removal and Installation ....................................... 91 .
STOP LAMP SWITCH ....................................... 84 . COMPONENTS .................................................. 91 .
TROUBLE DIAGNOSIS FOR SYMPTOMS ............. 85 . REMOVAL .......................................................... 91. D
RAS Warning Lamp Does Not Turn ON for Approx. INSTALLATION .................................................. 91 .
1 Second When The Igniting Switch Is Turned to ON 85 ... Disassembly and Assembly ................................... 92 .
DIAGNOSTIC PROCEDURE ............................. 85 . COMPONENTS .................................................. 92 . E
The Steering Force of Steering Wheel Is Not DISASSEMBLY .................................................. 92 .
Changed Smoothly According to the Vehicle Speed 87 ... INSPECTION AFTER DISASSEMBLY ............... 92 .
SYMPTOM: ........................................................ 87
. ASSEMBLY ........................................................ 92 .
DIAGNOSTIC PROCEDURE ............................. 87 . ADJUSTMENT AFTER ASSEMBLING .............. 92 . F
Hard Steering When Fully Turning the Steering

STC

Revision: 2005 November STC-3 2006 Q45
PRECAUTIONS
[WITHOUT REAR ACTIVE STEER]
PRECAUTIONS
[WITHOUT REAR ACTIVE STEER] PFP:00001

Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" NGS0005P

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along
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
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:
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.
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.
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.
Precautions NGS0005Q

q Before connecting or disconnecting the active damper sus-
pension control unit harness connector, turn ignition
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
turned "OFF".

SEF289H

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).
When connecting pin connectors make sure that there are
not any bends or breaks on active damper suspension con-
trol unit pin terminals.

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
STC-12, "Active Damper Suspension Control Unit Input/
Output Signal Reference Values" .

SDIA1848E

Revision: 2005 November STC-4 2006 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[WITHOUT REAR ACTIVE STEER]
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM PFP:28500
A
Power Steering Control Diagram NGS000CQ

STC
SGIA1389E

1. Speed sensor 2. Active damper suspension control 3. Power steering solenoid valve
unit
H
4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly
7. Pinion 8. Power steering oil pump 9. Reservoir tank

Operation Principle NGS000CV I
DURING PARKING (WHEN TURNING THE STEERING WHEEL TO THE RIGHT.)

SGIA1392E

1. Power steering solenoid valve is closed while a vehicle is stopped. M
2. Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
3. Oil pressure "P" in the gear housing assembly is the sum of oil pressures occurred in "2R" and "3R". This
results in a light steering force because of high pressure.

Revision: 2005 November STC-5 2006 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[WITHOUT REAR ACTIVE STEER]
DURING HIGH-SPEED OPERATION

SGIA1393E

1. Power steering solenoid valve is opened during high-speed operation.
2. Pinion "1R", "2R" and "3R" are closed depending on steering torque of steering wheel.
3. Oil pressure "2R" does not occur because the power steering solenoid valve is on full throttle.
4. Oil pressure "P" in the gear housing assembly includes only oil pressure occurred in "3R" and results in a
heavy steering force.
System Description NGS0004G

DESCRIPTION
q Electrically controlled power steering system is controlled by active damper suspension control unit.
q The system controls power steering solenoid valve by changing supply current to the power steering sole-
noid valve depending on vehicle speed.
POWER STEERING SOLENOID VALVE
q Vehicle speed sensing electronically controlled power steering
(that properly controls the steering force by the vehicle speed)
has been adopted. When it is normal, it controls the power
steering solenoid valve according to the vehicle speed as shown
in the figure and makes the steering force proper.
q Power steering solenoid valve becomes full throttle when the
power steering solenoid valve voltage is 2.5 V, and totally-
enclosed when the voltage is 5.5 V.

SST696CA

CONTROL UNIT
q The active damper suspension control unit (1) controls power
steering solenoid valve.
q Self-diagnosis can be done.

SGIA1394E

Revision: 2005 November STC-6 2006 Q45
ELECTRICALLY CONTROLLED POWER STEERING SYSTEM
[WITHOUT REAR ACTIVE STEER]
System Diagram NGS0005W

SGIA1395E

STC
COMPONENTS FUNCTION DESCRIPTION
Component parts Function
Active damper suspension control unit Controls power steering solenoid valve (with fail-safe function). H
Power steering solenoid valve Controls oil pressure in gear housing assembly.
Combination meter Combination meter sends vehicle speed signal to active damper suspension control unit.
I
ECM sends engine speed signal to active damper suspension control unit. (For fail-safe
ECM
conditions)

Revision: 2005 November STC-7 2006 Q45
TROUBLE DIAGNOSIS
[WITHOUT REAR ACTIVE STEER]
TROUBLE DIAGNOSIS PFP:00004

Fail-Safe Function NGS00061

Fail-safe function starts under the vehicle conditions listed below.
FAIL-SAFE INPUT CONDITIONS
Fail-safe input conditions Release conditions
No vehicle speed signal entered for at least 10 seconds while driving
q A vehicle speed signal of greater than 1.4 km/h (0.9 MPH)
at an engine speed of greater than 1,500 rpm.
is entered.
A vehicle speed signal of greater than 30 km/h (19 MPH) or abruptly
q Ignition switch is turned from "OFF" to "ON".
drops below 2 km/h (1 MPH).

NOTE:
When the engine is revved up to 1,500 rpm or more for at least 10 seconds with vehicle at standstill, the fail-
safe function operates; however, this is not a matter of concern. The fail-safe function can be released by driv-
ing vehicle of a speed of greater than 1.4 km/h (0.9 MPH) or by turning ignition switch from "OFF" to "ON".
q The fail-safe function operates to regulate power steering sole-
noid valve operation in response to engine speed, thereby main-
taining the required power steering force.

SST697CB

How to Perform Trouble Diagnosis NGS00062

BASIC CONCEPT
q To perform trouble diagnosis, it is the most important to have understanding about vehicle systems (con-
trol and mechanism) thoroughly.
q It is also important to clarify customer complaints before inspec-
tion.
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
customer.
CAUTION:
Customers are not professional. It is dangerous to make an
easy guess like "maybe the customer means that...," or
"maybe the customer mentions this symptom".
SEF233G

q It is essential to check symptoms right from the beginning in
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
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-
out any symptom diagnosis, you cannot judge if malfunctions
have actually been eliminated.
q After completing diagnosis, always erase diagnostic memory.
Refer to STC-15, "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.

Revision: 2005 November STC-8 2006 Q45
TROUBLE DIAGNOSIS
[WITHOUT REAR ACTIVE STEER]
Component Parts Location NGS0005Y

SGIA1398E

STC

Revision: 2005 November STC-9 2006 Q45
TROUBLE DIAGNOSIS
[WITHOUT REAR ACTIVE STEER]
Wiring Diagram -- EPS -- NGS00063

TGWM0075E

Revision: 2005 November STC-10 2006 Q45
TROUBLE DIAGNOSIS
[WITHOUT REAR ACTIVE STEER]

STC

TGWM0076E

Revision: 2005 November STC-11 2006 Q45
TROUBLE DIAGNOSIS
[WITHOUT REAR ACTIVE STEER]
Active Damper Suspension Control Unit Input/Output Signal Reference Values
NGS00064

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)

VHCL SPEED SE [km/h] Vehicle running Approximately equal
Wheel speed to the indication on
or [mph] CAUTION: speedometer (Inside
Check air pressure of tire under standard condition. of

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