Acura CSX. Manual — part 338
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EPS Control Unit Inputs and Outputs for Connector A (2P) (Connector disconnected)
EPS Control Unit Inputs and Outputs for Connector B (2P) (Connector disconnected)
EPS Control Unit Inputs and Outputs for Connector C (2P) (Connector disconnected)
Terminal
number
Wire color
Terminal sign
Description
Signal
Terminal
number
Wire color
Terminal sign
Description
Signal
Terminal
number
Wire color
Terminal sign
Description
Signal
17-26
EPS Components
System Description
NOTE: Standard battery voltage is 12 V.
1
BLK
PG
(Power ground)
Ground for the actuator EPS
motor
Continuity to ground
2
WHT
B
(Plus battery)
Power source for the
actuator EPS motor
Battery voltage at all times
1
GRN
H-W
Drives the actuator EPS
motor
1
RED
H-U
Drives the actuator EPS
motor
2
BLU
H-V
Drives the actuator EPS
motor
Wire side of female terminals
Wire side of female terminals
Wire side of female terminals
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04
EPS Control Unit Inputs and Outputs for Connector D (28P) (Connector disconnected)
Terminal
number
Wire color
Terminal sign
Description
Signal
17-27
NOTE: Standard battery voltage is 12 V.
1
WHT
CAN-H
(CAN-HI)
CAN communication circuit
3
BLU
NEP
(Engine pulse)
Detects tachometer signal
With engine running: pulses
7
BRN
SCS
(Service check signal)
Detects service check
connector signal
With service check signal not grounded: battery voltage
8
LT GRN
VS2
(Voltage sensor 2)
Detects torque sensor
signal
9
BRN
PVF
(Voltage fade)
Drives the torque sensor
10
GRN
VS1
(Voltage sensor 1)
Detects torque sensor
signal
12
PNK
S1
(Signal 1)
Detects motor angle sensor
signal
13
BLU
R1
(EPS Motor angle
sensor 1)
Detects motor angle sensor
signal
14
BRN
S2
(Signal 2)
Detects motor angle sensor
signal
15
RED
CAN-L
(CAN-LO)
CAN communication circuit
16
YEL
GRY
IG1
(Ignition 1)
Power source for activating
the system
With ignition switch ON (II): battery voltage
17
LT BLU
K-LINE
(Data link connector)
Communicates with HDS
With service check signal opened: about 5.0 V
26
BRN
S3
(Signal 3)
Detects motor angle sensor
signal
27
PNK
R2
(EPS Motor angle
sensor 2)
Detects motor angle sensor
signal
28
BLU
S4
(Signal 4)
Detects motor angle sensor
signal
1: ’06 model
2: ’07-09 models
1
2
Wire side of female terminals
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*01
System Outline
17-28
EPS Components
GAUGE CONTROL MODULE
ECM
Indicator drive signal
EPS CONTROL UNIT
EPS MOTOR
EPS MOTOR ANGLE SENSOR
TORQUE SENSOR
Motor drive signal
Motor angle signal
Torque signal
Idle control
demand
Communication via F-CAN
Vehicle
speed
signal
Engine
speed
signal
The power steering system adopts the electric power steering assisting for the control force of the steering wheel in
the driving force of the electric motor.
The EPS control unit is doing an appropriate steering force control according to the running situation of the vehicle (at
time of low speed, lightness, by the control of emphasis and high-speed running time, control with the steady weight
and the control which will be switched from low speed to high speed smoothly later) by the EPS motor.
The EPS control unit is designed for use with an automotive power steering for the primary purpose of controlling the
assist motor (brushless motor) for the power steering by using as inputs the steering torque signals received from the
‘‘steering torque sensor’’ installed in the steering gearbox as well as the speed signals received from the ‘‘vehicle
speed sensor’’ installed in the vehicle. In addition to the above function, the EPS control unit also provides the failsafe
function, self diagnosis function and motor output limiting function.
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Steering Gearbox
Torque Sensor
17-29
Worm wheel gear
Worm gear
EPS motor
Torque sensor
Steered to right
Center
Steered to left
Steered to left
Steered to right
0
VT1
VT3
VT2
Input voltage (V)
Core
Coil
The EPS motor engages with a pinion and one worm wheel gear, which is transmitted to a direct pinion, to move a
rack.
When the steering wheel is turned, twist occurs in the torsion bar between the steering side of the input shaft and the
output shaft on the road reaction force side. Inductance is changed by the movement of the core. The amount this
voltage changes (varies with the amount of movement, and direction of the core) is amplified with the interface
circuitry of the sensor coil, and output to the EPS control unit as a steer signal.
08/08/21 14:54:01 61SNR030_170_0030
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