Infiniti M35/M45 Y50. Manual — part 1111
STC-1
STEERING CONTROL SYSTEM
G STEERING
CONTENTS
C
D
E
F
H
I
J
K
L
M
SECTION
STC
A
B
STC
STEERING CONTROL SYSTEM
EPS
SYSTEM DESCRIPTION . . . . . . . . . . . 3
FAIL-SAFE INPUT/CANCEL CONDITIONS . . . 4
TROUBLE DIAGNOSIS . . . . . . . . . . . .. 5
How to Perform Trouble Diagnosis . . . . . . .. 5
BASIC CONCEPT . . . . . . . . . . . . . 5
STANDARD BY CIRCUIT TESTER AND OSCIL-
LOSCOPE . . . . . . . . . . . . . . . . 8
For Fast and Accurate Trouble Diagnosis . . . . 9
Basic Inspection . . . . . . . . . . . . . ... 9
POWER SUPPLY CIRCUIT TERMINAL LOOSE-
NESS AND BATTERY . . . . . . . . . . .. 9
RAS
REAR ACTIVE STEER . . . . . . . . . . . . 13
Removal and Installation . . . . . . . . . . 13
Disassembly and Assembly . . . . . . . . ... 14
Neutral Position Adjustment . . . . . . . . ... 14
SYSTEM DESCRIPTION . . . . . . . . . . .. 16
Components . . . . . . . . . . . . . . ... 16
RAS (Rear Active Steer) Function . . . . . . .. 16
Fail-Safe Function . . . . . . . . . . . . .. 17
TROUBLE DIAGNOSIS . . . . . . . . . . . 18
How to Perform Trouble Diagnosis . . . . . . . 18
BASIC CONCEPT . . . . . . . . . . . ... 18
CIRCUIT TESTER REFERENCE VALUE . . ... 26
STANDARD BY CONSULT-II . . . . . . . .. 27
CONSULT-II Function (RAS/HICAS) . . . . . .. 27
Diagnosis Procedure with Self-Diagnosis Function
(Without CONSULT-II) . . . . . . . . . . . 31
Trouble Diagnosis Chart . . . . . . . . . . . 33
SELF-DIAGNOSIS . . . . . . . . . . . .. 33
DIAGNOSIS CHART BY SYMPTOM . . . . .. 34
STC-2
SYSTEM DESCRIPTION
STC-3
[EPS]
C
D
E
F
H
I
J
K
L
M
A
B
STC
[EPS]
SYSTEM DESCRIPTION
PFP:00000
Components
NGS000DT
Components (Models with Rear Active Steer)
NGS000DU
Electronically Controlled Power Steering System Function
NGS000DV
●
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.
●
For the models with RAS (Rear Active Steer), RAS control unit
performs the same control as power steering control unit. For
schematic, refer to
and trouble diagnosis,
refer to
STC-47, "Diagnosis Chart by Symptom 2"
.
SGIA1056E
SGIA1094E
SST696CA
STC-4
[EPS]
SYSTEM DESCRIPTION
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.
FAIL-SAFE INPUT/CANCEL CONDITIONS
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.
SGIA0411E
Input conditions
Cancel conditions
When vehicle runs at an engine speed of 1,500 rpm or higher and no vehicle speed signal
is received for 10 seconds.
●
A vehicle speed of 2 km/h (1.2 MPH) or
more is input.
●
Turn the ignition switch ON after turn-
ing it OFF.
The continuous vehicle speed signal 30 km/h (19 MPH) or more suddenly drops to less
than 2 km/h (1.2 MPH) within 1.4 seconds.
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