Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Infiniti M45 M35 Y50 2006-2007 Approved M45_M35-Y50-2007 stc
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STEERING CONTROL SYSTEM
G STEERING
A
SECTION
STEERING CONTROL SYSTEM
STC B
C
D
E
CONTENTS
EPS RAS (Rear Active Steer) Function ......................... 16 . F
Fail-Safe Function ................................................. 17
.
SYSTEM DESCRIPTION ........................................... 3 . TROUBLE DIAGNOSIS ........................................... 18 .
Components ............................................................ 3
. How to Perform Trouble Diagnosis ........................ 18 . STC
Components (Models with Rear Active Steer) ........ 3 . BASIC CONCEPT .............................................. 18 .
Electronically Controlled Power Steering System Component Parts Location .................................... 19 .
Function .................................................................. 3
. Schematic .............................................................. 20
.
Fail-Safe Function ................................................... 4
. H
Wiring Diagram -- RAS -- .................................... 21 .
FAIL-SAFE INPUT/CANCEL CONDITIONS ........ 4 . Control Unit Input/Output Signal Standard ............ 26 .
TROUBLE DIAGNOSIS ............................................. 5 . CIRCUIT TESTER REFERENCE VALUE .......... 26 .
How to Perform Trouble Diagnosis ......................... 5 . STANDARD BY CONSULT-II ............................. 27 . I
BASIC CONCEPT ................................................ 5 . CONSULT-II Function (RAS/HICAS) ..................... 27 .
Component Parts Location ...................................... 5 . FUNCTION ......................................................... 27
.
Wiring Diagram -- EPS -- ...................................... 6 . CONSULT-II SETTING PROCEDURE ............... 28 . J
Control Unit Input/Output Signal Standard .............. 8 . SELF-DIAG RESULT MODE .............................. 28 .
STANDARD BY CIRCUIT TESTER AND OSCIL- DATA MONITOR MODE ..................................... 30 .
LOSCOPE ............................................................ 8
. ACTIVE TEST MODE ........................................ 30 .
For Fast and Accurate Trouble Diagnosis ............... 9 . K
RAS CONTROL UNIT PART NUMBER ............. 30 .
Basic Inspection ...................................................... 9
. Diagnosis Procedure with Self-Diagnosis Function
POWER SUPPLY CIRCUIT TERMINAL LOOSE- (Without CONSULT-II) ........................................... 31 .
NESS AND BATTERY ......................................... 9 . DESCRIPTION ................................................... 31 . L
Inspection: Power Steering Control Unit Power Sup- SELF-DIAGNOSIS PROCEDURE ..................... 31 .
ply Circuit and Ground ............................................ 9 . SELF-DIAGNOSIS DISPLAY ............................. 31 .
Symptom: The Steering Force Does Not Change SELF-DIAGNOSIS DISPLAY ITEMS ................. 31 . M
Smoothly According to the Vehicle Speed ............ 10 . HOW TO ERASE SELF-DIAGNOSIS ................ 31 .
CAN Communication ............................................. 31 .
RAS For Fast and Accurate Trouble Diagnosis ............. 32 .
Basic Inspection .................................................... 32
.
REAR ACTIVE STEER ............................................ 13 . BASIC INSPECTION 1: POWER SUPPLY CIR-
Removal and Installation ....................................... 13
. CUIT TERMINAL LOOSENESS AND BATTERY 32 ...
COMPONENTS ................................................. 13 . BASIC INSPECTION 2: RAS WARNING LAMP
REMOVAL .......................................................... 13
. INSPECTION ..................................................... 32.
INSTALLATION .................................................. 13
. BASIC INSPECTION 3: RAS CONTROL UNIT
Disassembly and Assembly .................................. 14 . POWER SUPPLY CIRCUIT AND GROUND CIR-
COMPONENTS ................................................. 14 . CUIT INSPECTION ............................................ 32 .
DISASSEMBLY .................................................. 14
. Trouble Diagnosis Chart ........................................ 33 .
INSPECTION AFTER DISASSEMBLY .............. 14 . SELF-DIAGNOSIS ............................................. 33 .
ASSEMBLY ........................................................ 14
. DIAGNOSIS CHART BY SYMPTOM ................. 34 .
Neutral Position Adjustment .................................. 14 . Inspection 1: RAS Control Unit Malfunction .......... 35 .
SYSTEM DESCRIPTION ......................................... 16 . Inspection 2: Motor Power Supply System ............ 35 .
Components .......................................................... 16
.
Revision: 2007 April STC-1 2007 M35/M45
Inspection 3: RAS Motor Output Malfunction ........ 37 . Inspection 10: Stop Lamp Switch Harness ............45 .
Inspection 4: Vehicle Speed Signal ....................... 38 . Inspection 11: RAS Warning Lamp Harness ..........46 .
Inspection 5: Steering Angle Signal Malfunction ... 39 Diagnosis Chart by Symptom 1 .............................47 .
Inspection 6: Rear Main Signal and Rear Sub Signal Diagnosis Chart by Symptom 2 .............................47 .
Malfunction ............................................................ 40
. Check RAS Static/Dynamic Characteristics ...........49 .
Inspection 7: VDC Malfunction .............................. 43 . Component Inspection ...........................................50
.
Inspection 8: Engine Speed Signal Malfunction .... 44 . RAS MOTOR RELAY ..........................................50 .
Inspection 9: CAN Communication System Mal- RAS MOTOR ......................................................50
.
function .................................................................. 44
. REAR WHEEL STEERING ANGLE SENSOR ...50
Revision: 2007 April STC-2 2007 M35/M45
SYSTEM DESCRIPTION
[EPS]
SYSTEM DESCRIPTION
[EPS] PFP:00000
A
Components NGS000DT
B
C
D
E
F
SGIA1056E
STC
Components (Models with Rear Active Steer) NGS000DU
H
I
J
K
L
M
SGIA1094E
Electronically Controlled Power Steering System Function NGS000DV
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 For the models with RAS (Rear Active Steer), RAS control unit
performs the same control as power steering control unit. For
schematic, refer to STC-20, "Schematic" and trouble diagnosis,
refer to STC-47, "Diagnosis Chart by Symptom 2" .
SST696CA
Revision: 2007 April STC-3 2007 M35/M45
SYSTEM DESCRIPTION
[EPS]
Fail-Safe Function NGS000DW
When the fail-safe function operate, it controls power steering sole-
noid valve by the engine speed as shown in the figure and maintains
the steering force.
SGIA0411E
FAIL-SAFE INPUT/CANCEL CONDITIONS
Input conditions Cancel conditions
When vehicle runs at an engine speed of 1,500 rpm or higher and no vehicle speed signal q A vehicle speed of 2 km/h (1.2 MPH) or
is received for 10 seconds. more is input.
The continuous vehicle speed signal 30 km/h (19 MPH) or more suddenly drops to less q Turn the ignition switch ON after turn-
than 2 km/h (1.2 MPH) within 1.4 seconds. ing it OFF.
CAUTION:
Fail-safe function is activated when the engine runs at 1,500 rpm or higher for 10 seconds with the vehicle stopped. This is
normal and the fail-safe function is automatically deactivated when a vehicle speed signal of 2 km/h (1.2 MPH) or higher is
input or the ignition switch is turned OFF.
Revision: 2007 April STC-4 2007 M35/M45
TROUBLE DIAGNOSIS
[EPS]
TROUBLE DIAGNOSIS PFP:00004
A
How to Perform Trouble Diagnosis NGS000DX
BASIC CONCEPT
q The most important point to perform trouble diagnosis is to understand systems (control and mechanism) B
in vehicle thoroughly.
q It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully. C
Ask customer about his/her complaints carefully. In some cases,
they will be necessary to check symptom by driving vehicle with
customer. D
CAUTION:
Customers are not professionals. Do not assume "maybe
customer means..." or "maybe customer mentioned this E
symptom".
SEF234G
q It is essential to check symptoms right from beginning in order to F
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples. STC
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. H
When repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
q Always read "GI General Information" to confirm general precau-
tions. Refer to GI-4, "General Precautions" . I
SEF233G
Component Parts Location NGS000DY
J
K
L
SGIA1105J
M
1. Power steering control unit 2. Power steering solenoid valve
(Back of center console assembly)
Revision: 2007 April STC-5 2007 M35/M45
TROUBLE DIAGNOSIS
[EPS]
Wiring Diagram -- EPS -- NGS000DZ
TGWT0023E
Revision: 2007 April STC-6 2007 M35/M45
TROUBLE DIAGNOSIS
[EPS]
A
B
C
D
E
F
STC
H
I
J
K
L
M
TGWT0024E
Revision: 2007 April STC-7 2007 M35/M45
TROUBLE DIAGNOSIS
[EPS]
Control Unit Input/Output Signal Standard NGS000E0
STANDARD BY CIRCUIT TESTER AND OSCILLOSCOPE
CAUTION:
When checked using a circuit tester for voltage measurement, connector terminals should not be
forcefully extended.
Terminal Measuring
Measuring condition Standard
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