steering wheel ACURA CSX 2006 Service Owner's Guide

Î
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
ProCarManuals.com
DYNOMITE -2009-

Î
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
ProCarManuals.com
DYNOMITE -2009-

(#' '
)
(#' ')
µ
µ
µ
µ µ
µ
µ
µ
DTC 32-01:
DTC 32-02:
DTC 35-01:
DTC 35-02:
DTC 35-04:
DTC 35-06:
DTC 35-07:
DTC 36-02:
DTC 37-01: DTC 32-07:
YES
NO
YES
NO YES
NO
YES
NO
17-3917-39
EPS Control Unit Internal Circuit
(Current Sensor) (Initial Diagnosis)
EPS Control Unit Internal Circuit
(Current Sensor) (Regular Diagnosis)
EPS Control Unit Internal Circuit
(CPU) (Initial Diagnosis/Regular Diagnosis)
EPS Control Unit Internal Circuit
(EEPROM) (Initial Diagnosis)
EPS Control Unit Internal Circuit
(CPU Communication) (Regular Diagnosis)
EPS Control Unit Internal Circuit
(ITN Communication) (Regular Diagnosis)
EPS Control Unit Internal Circuit
(INHL/INHR Ports) (Initial Diagnosis/Regular
Diagnosis)
EPS Control Unit Internal Circuit
(INH Output Circuit) (Initial Diagnosis)
EPS Control Unit Internal Circuit
(Step-up Circuit) (Initial Diagnosis) EPS Control Unit Internal Circuit
(Current Sensor) (Steering Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
Go to step 5.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
5. Check for DTCs with the HDS.
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). Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time. 1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Turn the steering wheel to the right or left, and wait
10 seconds or more.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Check for DTCs with the HDS.
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).
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
Does t he E PS i nd i cat or come on?
Is DT C 32-01, 32-02, 35-01, 35-02, 35-04, 35-06,35-07 , 36-02, or 37 -01 ind icated ? Does t he E PS i nd i cat or come on?
Is DTC 32-07 indicated?
08/08/21 14:54:04 61SNR030_170_0040
ProCarManuals.com
DYNOMITE -2009-

Î
(#' ')
µ
µ
µ
µ µ
µ
DTC 32-08:
DTC 32-09:
YES
NO
YES
NO YES
NO
17-40EPS Components
DTC Troubleshooting (cont’d)
EPS CONTROL UNIT
CONNECTOR B
EPS CONTROL UNIT
CONNECTOR C
No. 1
No. 2
No. 1
No. 2
No. 1
No. 1
EPS CONTROL UNIT CONNECTOR B (2P)
H-V (BLU)
H-U (RED) H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P)
Current Sensor (Regular
Diagnosis)
Current Sensor (Initial Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Turn the steering wheel to the right or left, and wait10 seconds or more.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Check for DTCs with the HDS.
Go to step 7.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
7. Turn the ignition switch to LOCK (0). 8. Disconnect EPS control unit connector B (2P) and
connector C (2P).
9. Check for continuity between the following terminals of the EPS control unit connector B (2P)
and connector C (2P).
Check for loose terminals in the EPS control
unit connectors and EPS motor connectors, and
repair if necessary. If no poor connections are
found, replace the EPS control unit (see page 17-84).
Go to step 10.
Wire side of female terminals
Wire side of female terminals
Does t he E PS i nd i cat or come on? I s DT C 32-08 or 32-09 i nd i cat ed ? Is there continuity?
08/08/21 14:54:32 61SNR030_170_0041
ProCarManuals.com
DYNOMITE -2009-

Î
(#' '
)
µ
µ
µ
µ µ
µ
DTC 61-04:
YES
NO
YES
NO YES
NO
17-53
EPS CONTROL UNIT
CONNECTOR B
EPS CONTROL UNIT
CONNECTOR C
No. 1
No. 2
No. 1
No. 2
No. 1
No. 1
EPS CONTROL UNIT CONNECTOR B (2P)
H-V (BLU)
H-U (RED) H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P)
Open/Short in EPS Motor Harness
(Steering Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Turn the steering wheel to the right or left, and wait
10 seconds or more.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Check for DTCs with the HDS.
Go to step 7.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the EPS control unit connector B (2P) and connector C (2P). 9. Check for continuity between the following
terminals of the EPS control unit connector B (2P)
and connector C (2P).
Go to step 10.
Go to step 13.
(cont’d)
Wire side of female terminals
Wire side of female terminals
Does t he E PS i nd i cat or come on? Is DT C 61-04 indicated? Is there continuity?
08/08/21 14:54:36 61SNR030_170_0054
ProCarManuals.com
DYNOMITE -2009-

Î
(#' '

)
µ
µ µ
µ
µ
µ
YES
NO
YES
NO
YES
NO
DTC 71-01:
DTC 71-02:
DTC 71-03:
DTC 71-05:
DTC 71-06:
17-5517-55
No. 1
No. 2
No. 1
No. 2
H-W (RED)
H-U (BLK)
H-V (WHT)
EPS MOTOR
1P CONNECTOR
EPS MOTOR
2P CONNECTOR
No. 1
No. 1
EPS MOTOR 2P CONNECTOR
EPS MOTOR 1P CONNECTOR
13. Disconnect the EPS motor 1P connector and the
EPS motor 2P connector.
14. On the EPS motor side, check for continuity between the following terminals of the EPS motor
1P and the EPS motor 2P connector.
Repair open in the wire between the EPS
control unit and the EPS motor.
Open in the EPS motor wire, or EPS motor
internal circuit, replace the EPS motor (see page
17-63). 1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Turn the steering wheel to the right or left, and wait
10 seconds or more.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Check for DTCs with the HDS.
Go to step 7.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Disconnect EPS control unit connector D (28P).
(cont’d)EPS Motor Angle Sensor (SIN/
COS Signals) (Steering Diagnosis)
EPS Motor Angle Sensor (Neutral
Position Learning of SIN/COS) (Initial
Diagnosis)
EPS Motor Angle Sensor (SIN/
COS Signals) (Steering Diagnosis)
EPS Motor Angle Sensor (SIN/
COS Signals Charging Amount) (Steering
Diagnosis)
EPS Motor Angle Sensor (Neutral
Position of SIN/COS) (Initial Diagnosis)
Terminal side of male terminal
Terminal side of male terminals
Is there continuity? Does t he E PS i nd i cat or come on?
Is DT C 7 1-01, 7 1-02, 7 1-03, 7 1-05 or 7 1-06indicated?
08/08/21 14:54:37 61SNR030_170_0056
ProCarManuals.com
DYNOMITE -2009-

µ


(#' '
)
µ
µ
µ
µ µ
µ
µ
µ
DTC 71-04:
YES
NO
YES
NO YES
NO
YES
NO
17-58EPS Components
DTC Troubleshooting (cont’d)
EPS CONTROL UNIT CONNECTOR D (28P)
R1 (BLU)
R2 (PNK)
EPS CONTROL UNIT CONNECTOR D (28P) R1 (BLU)
R2 (PNK)
EPS Motor Angle Sensor (Check
Signals) (Regular Diagnosis)
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0).
4. Start the engine.
5. Turn the steering wheel to the right or left, and wait
10 seconds or more.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Check for DTCs with the HDS.
Go to step 7.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
7. Turn the ignition switch to LOCK (0).
8. Disconnect the EPS control unit connector D (28P). 9. Measure the resistance between the EPS control
unit connector D (28P) terminal No. 13 and No. 27.
Go to step 10.
Go to step 13.
10. Check for continuity between body ground and the EPS control unit connector D (28P) terminal No. 13
and the terminal No. 27 individually.
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).
Wire side of female terminals
Wire side of female terminalsDoes t he E PS i nd i cat or come on?
Is DTC 71-04 indicated? Is t he r esi st ance bet w een 13 25 ?
Is there continuity?
08/08/21 14:54:38 61SNR030_170_0059
ProCarManuals.com
DYNOMITE -2009-

Ì
Ï 
(#'




 )
Special Tools Required
Removal
17-65
Steering Gearbox Removal and Installation
A
 Ball joint remover, 28 mm 07MAC-SL0A202
 Engine hanger adapter
VSB02C000015
 Front subframe adaptor VSB02C000016
 2006 Civic engine hanger VSB02C000025
 Engine support hunger, A and Reds AAR-T1256 : These special tools are available through Honda
Canada Inc. Technical Tools Department; FAX 866-
398-8665/e-mail: ch_technicaltools ch. honda. com
Note these items during removal:  Use solvent and a brush, wash any oil and dirt off the end of the steering gearbox. Avoid any electrical
parts. Blow dry with compressed air.
 Be sure to remove the steering wheel before disconnecting the steering joint, or damage to the
cable reel may occur.
1. Do the battery terminal disconnection procedure (see page 22-68).
2. Raise the front of the vehicle, and support it with safety stands in the proper locations (see page
1-11).
3. Remove the front wheels.
4. Remove the driver’s airbag (see page 24-188), and the steering wheel (see page 17-6).
5. Remove the driver’s dashboard undercover (see page 20-103). 6. Remove the steering joint cover (A).
(cont’d)
08/08/21 14:55:09 61SNR030_170_0066
ProCarManuals.com
DYNOMITE -2009-


Î

17-76EPS Components
Steering Gearbox Removal and Installation (cont’d)
A
B
C
12x1.25mm
59 N·m
(6.0 kgf·m, 43 lbf·ft)
D
12x1.25mm
59 N·m
(6.0 kgf·m, 43 lbf·ft) B
A
E
12x1.25mm
59 N·m
(6.0 kgf·m,
43 lbf·ft) D
C
AB
B
12x1.25mm
54 N·m
(5.5 kgf·m,
40 lbf·ft)
A D
E
C
20. Install the exhaust hanger (A) to the three way
catalytic converter (TWC) (B).
21. Connect the lower arm (A) to the lower ball joint (B).
22. Install a new flange bolt and the new self-locking nuts. After lightly tightening all three fasteners,
tighten them to the specified torque in the
following order; the self-locking nut on the front (C),
the self-locking nut on the rear (D), then the flange
bolt (E). 23. Remove the vinyl tape, then connect the EPS motor
connector A (2P), the EPS motor connector B (1P),
torque sensor 4P connector (C), the EPS motor
angle sensor 6P connector (D) to the steering
gearbox. Make sure to push these connectors until
you hear a click so that the connectors are secured.
24. Install the front splash shield (see page 20-172).
25. Wipe off any grease contamination from the ball joint tapered section and the threads. Reconnect
the tie-rod ends (A) to the steering knuckles. Install
the 12 mm nut (B) and tighten it.
26. Install the new cotter pin (C), and bend it as shown (D) or (E).
27. Install the front wheel, then set the wheels in the straight ahead position.
NOTE: Before installing the wheel, clean the mating
surfaces between the brake disc and inside of the
wheel.
Replace.
Replace.
Replace. Replace.
08/08/21 14:55:18 61SNR030_170_0077
ProCarManuals.com
DYNOMITE -2009-

SymptomProbable cause
17-78EPS Components
Steering Gearbox Removal and Installation (cont’d)
34. Install the steering wheel (see page 17-8).
35. With the tires raised off the ground (vehicle on a
lift), check for the following symptoms by turning
the steering wheel fully to the right and left several
times.
Rubbing sound
coming from the
lower steering
column area. Steering column joint
is contacting the cover.
Grating sound from
the lower steering
column area, or a
rough feeling during
steering. Poor engagement of
the pinion shaft
serrations.
Noise from around
the steering wheel
during steering. Poor engagement of
the SRS cable reel with
the steering wheel, or a
damaged cable reel.
36. Install the air cleaner housing (see page 11- 345).
37. Install the under cowl panel and cowl cover (see page 20-163). 38. Do the battery terminal reconnection procedure
(see page 22-68), and do these tasks:
 Turn the ignition switch to ON (II) and check that the SRS indicator comes on for about 6 seconds
and then goes off.
 Make sure the horn and turn signal switches work properly.
 Make sure the steering wheel switches work properly.
39. After installation, do the following checks:  Check the steering wheel spoke angle. If steeringspoke angles to the right and left are not equal
(steering wheel and rack are not centered),
correct the engagement of the joint/pinion shaft
splines.
 Set the steering column to the center tilt position, and to the center telescopic position, then check
the wheel alignment and adjust (see page 18-5).
 Make sure the steering wheel spokes are centered.
 Start the engine, and let it idle. Turn the steering wheel from lock-to-lock several times. Check that
the EPS indicator does not come on.
 Do the memorizing for the torque sensor neutral position (see page 17-22).
08/08/21 14:55:18 61SNR030_170_0079
ProCarManuals.com
DYNOMITE -2009-