2006 ACURA CSX gearbox

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17-22EPS Components
Memorizing the Torque Sensor Neutral Position
A
The torque sensor neutral position must be memorized
whenever the steering gearbox, the torque sensor, the
EPS motor, or the EPS control unit is replaced. Note that
the torque sensor neutral position is not affected when
erasing the DTC.
NOTE: The torque sensor is temperature sensitive.
When memorizing the torque sensor neutral position,
theambienttemperaturemustbeabove20 10°C
(68 18 °F)
1. With the ignition switch in LOCK (0), connect the HDS to the data link connector (DLC) (A) located
under the driver’s side of the dashboard.
2. Turn the ignition switch to ON (II).
3. Make sure the HDS communicates with the vehicle and the EPS control unit. If it doesn’t, troubleshoot
the DLC circuit (see page 11-204).
4. From the EPS MENU, select MISCELLANEOUS TEST, then TORQUE SENSOR LEARN, and follow
the screen prompts on the HDS.
NOTE: See the HDS Help menu for specific
instructions.
5. Turn the ignition switch to LOCK (0).
08/08/21 14:53:59 61SNR030_170_0023
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System Outline
17-28EPS Components
System Description (cont’d)
GAUGE CONTROL MODULE
ECM
Indicator drive signal
EPS CONTROL UNITEPS 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.
08/08/21 14:54:00 61SNR030_170_0029
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Î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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´
17-31
EPS CONTROL UNIT
WHT
BLU
WHT
RED
BRN STEERING GEARBOX
PNK
PNK BLU
BRN GRN
YEL
BLU EPS MOTOR
ANGLE SENSOR
BRN
BLU BLK
BRN
RED
BLU RED GRN
WHT
BLK RED
BLK
GRN
BRN
LT GRN TORQUE
SENSOR
PNK
BLU/RED
WHT/GRN
LT BLU YEL*
GRY*
EPS MOTOR
5V
REGULATOR
FAIL-SAFE
RELAY
POWER RELAY
FAIL-SAFE
RELAY
IG1 VCC
B
A2
IG1 D16
D3
NEP
D1
D15
D7
D17
SCS
CAN-L
CAN-H
K-LINE D13
R2 R1
S3 S1 5
2
4
1
S4 S2 6 3
H-V H-U H-W 2
1
1
PG D12 D27
D26
D14
D28
B1
C1
C2
A1
VS1 D10
PVF D9
VS2 D8
CAN
CONTROLLER R2
R1
S3 S1
S4 S2
H-V H-U
H-W
VS1
PVFVS2 1
2
3
G402
G403
:12V
:5V
*1: ’06 model
*2: ’07-09 models
1
2
(cont’d)
08/08/21 14:54:02 61SNR030_170_0032
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µ
µ µ
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YES
NO
YES
NO
17-48EPS Components
DTC Troubleshooting (cont’d)
EPS CONTROL UNIT CONNECTOR D (28P)
PVF (BRN) EPS CONTROL UNIT CONNECTOR D (28P)
PVF (BRN)
10. Check for continuity between EPS control unitconnector D (28P) terminal No. 9 and body ground.
Go to step 11.
Check for loose terminals in the EPS control
unit connectors, and repair if necessary. If no poor
connections are found, replace the EPS control unit
(see page 17-84). 11. Disconnect the torque sensor 3P connector from
the steering gearbox.
12. Check for continuity between EPS control unit connector D (28P) terminal No. 9 and body ground.
Repair short to body ground in the wire
between the torque sensor and the EPS control
unit.
Faulty torque sensor (short in the sensor
internal circuit), replace the steering gearbox
(see page 17-65).
Wire side of female terminals
Wire side of female terminals
Is there continuity?Is there continuity?
08/08/21 14:54:34 61SNR030_170_0049
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µµ

µ
µ µ
µ
YES
NO
YES
NO
17-49
TORQUE SENSOR 3P CONNECTOR
VS1 PVF TORQUE SENSOR 3P CONNECTOR
VS2
PVF
13. Disconnect the torque sensor 3P connector from the steering gearbox.
14. On the sensor side, measure the resistance between torque sensor 3P connector terminals
No. 1 and No. 2.
Repair open or short between the PNK and
BLU/RED wires in the torque sensor circuit between
the torque sensor and the EPS control unit.
Faulty torque sensor (short or open in the
internal circuit), replace the steering gearbox
(see page 17-65). 15. Disconnect the torque sensor 3P connector from
the steering gearbox.
16. On the sensor side, measure the resistance between torque sensor 3P connector terminals
No. 2 and No. 3.
Repair open or short between the WHT/GRN
and BLU/RED wires in the torque sensor circuit
between the torque sensor and the EPS control
unit.
Faulty torque sensor (short or open in the
internal circuit), replace the steering gearbox
(see page 17-65).
Terminal side of male terminals Terminal side of male terminals
Is t he r esi st ance bet w een 12 15 ?Is t he r esi st ance bet w een 12 15 ?
08/08/21 14:54:35 61SNR030_170_0050
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DYNOMITE -2009-


µ
µ µ
µ
YES
NO
YES
NO
17-51
EPS CONTROL UNIT CONNECTOR D (28P)
PVF (BRN) EPS CONTROL UNIT CONNECTOR D (28P)
PVF (BRN)
10. Check for continuity between EPS control unitconnector D (28P) terminal No. 9 and body ground.
Go to step 11.
Check for loose terminals in the EPS control
unit connectors, and repair if necessary. If no poor
connections are found, replace the EPS control unit
(see page 17-84).
11. Disconnect the torque sensor 3P connector from the steering gearbox. 12. Check for continuity between EPS control unit
connector D (28P) terminal No. 9 and body ground.
Repair short to body ground in the wire
between the torque sensor and the EPS control
unit.
Faulty torque sensor (short in the sensor
internal circuit), replace the steering gearbox
(see page 17-65).
(cont’d)
Wire side of female terminals Wire side of female terminals
I s t her e cont i nui t y ?I s t her e cont i nui t y ?
08/08/21 14:54:36 61SNR030_170_0052
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µ
µ µ
µ
YES
NO
YES
NO
17-52EPS Components
DTC Troubleshooting (cont’d)
TORQUE SENSOR 3P CONNECTOR
VS1 PVF TORQUE SENSOR 3P CONNECTOR
VS2
PVF
13. Disconnect the torque sensor 3P connector from the steering gearbox.
14. On the sensor side, measure the resistance between torque sensor 3P connector terminals
No. 1 and No. 2.
Repair open or short between the PNK and
BLU/RED wires in the torque sensor circuit between
the torque sensor and the EPS control unit.
Faulty torque sensor (short or open in the
internal circuit), replace the steering gearbox
(see page 17-65). 15. Disconnect the torque sensor 3P connector from
the steering gearbox.
16. On the sensor side, measure the resistance between torque sensor 3P connector terminals
No. 2 and No. 3.
Repair open or short between the BLU/RED
and WHT/GRN wires in the torque sensor circuit
between the torque sensor and the EPS control
unit.
Faulty torque sensor (short or open in the
internal circuit), replace the steering gearbox
(see page 17-65).
Terminal side of male terminals Terminal side of male terminals
Is t he r esi st ance bet w een 12 15 ?Is t he r esi st ance bet w een 12 15 ?
08/08/21 14:54:36 61SNR030_170_0053
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