2006 ACURA CSX power steering


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µµ
Rotational play: 0 10 mm (0 0.39 in.)
17-417-4 Steering
Steering Wheel Rotational Play
Check
Power Assist Check
1. Turn the front wheels to the straight ahead position.
2. Measure how far you can turn the steering wheel
left and right without moving the front wheels.
 If the play is within the limit, the steering gearbox and steering linkage are OK.
 If the play exceeds the limit, adjust the rack guide (see page 17-15). If the play is still excessive after
rack guide adjustment, inspect the steering
linkage and steering gearbox (see page 17-5). NOTE: This test should be done with original equipment
tires and wheels at the correct tire pressure.
1. Start the engine, and let it idle.
2. Attach a commercially available spring scale to the steering wheel. With the engine idling and the
vehicle on a clean, dry floor, pull the scale as
shown, and read it as soon as the tires begin to turn.
3. Ifthescalereadsnomorethan34N(3.5kgf,7.7lbf), the power assist is OK. If it reads more, check these
items:
 Steering linkage (see page 17-5)
 Rack guide adjustment (see page 17-15)
 EPS system (see page 17-19)
08/08/21 14:53:13 61SNR030_170_0005
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DYNOMITE -2009-



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Special Tools Required
Specified return angle: 7 3 °
17-15
Rack Guide Adjustment
AB
07MAA-SL0020A
A
B A
73°
B
44 N·m
(4.5 kgf·m, 33 lbf·ft)
Locknut wrench, 43 mm 07MAA-SL0020A1. Set the wheels in the straight ahead position.
2. Loosen the rack guide screw locknut (A) with the locknut wrench, then remove the rack guide screw
(B).
3. Remove the old sealant from the rack guide screw (A), and apply new sealant (Three Bond 1215 or
Loctite 5699) to the middle of the threads (B).
Loosely install the rack guide screw on the steering
gearbox.
NOTE: If more than 5 minutes has passed after
applying the sealant, remove the old sealant and
residue, and reapply new sealant. 4. Tighten the rack guide screw (A) to 25 N·m
(2.5 kgf·m, 18 lbf·ft), then loosen it.
5. Retighten the rack guide screw to 3.9 N·m (0.4 kgf·m, 2.9 lbf·ft), then back it off to the specified
angle.
6. Hold the rack guide screw stationary with a wrench, and tighten the locknut (B) by hand until it’s fully
seated.
7. Install the locknut wrench on the locknut, and hold the rack guide screw stationary with a wrench.
Tighten the locknut to the specified torque.
8. Check for unusual steering effort through the complete turning range.
9. Check the steering wheel rotational play (see page 17-4) and the power assist (see page 17-4).
08/08/21 14:53:19 61SNR030_170_0016
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EPS IndicatorDiagnostic Trouble Code (DTC)
Self-diagnosis
17-19
General Troubleshooting Information
Under normal conditions, the EPS indicator comes on
when the ignition switch is turned to ON (II), then goes
off after the engine is started. This indicates that the
LED and its circuit are operating correctly.
If there is a failure in the system after the engine is
started, the EPS indicator will stay on, and the power
assist is turned off or restricted.
When the EPS indicator comes on, the control unit
memorizes the DTC. In this case, the control unit will
not activate the EPS system after the engine starts
again, but it keeps the EPS indicator on.
When DTC 51-01, 51-02 or 51-06 is stored in the control
unit, the EPS indicator will stay on until the DTC is
erased. When a problem is detected and the EPS
indicator comes on, there are cases when the indicator
stays on until the ignition switch is turned to LOCK (0),
and cases when the indicator goes off automatically
when the system returns to normal. Even though the
system is operating normally, the EPS indicator will
come on under the following conditions:  The vehicle speed decreases abruptly from 20 km/h (12 mph) or more (by applying brake), and it is less
than 1 km/h (1 mph) and engine speed is 2,000 rpm or
above for 5 seconds (continuously) after the abrupt
deceleration.
 While turning the steering wheel with the vehicle speed of 1 km/h (1 mph) or less for 20 seconds, and
the engine speed is 2,000 rpm or above for at least
10 seconds.
 When the engine speed is 500 rpm or less, and the vehicle is traveling at a speed of 10 km/h (6 mph) or
more for about 3 seconds.
To determine the actual cause of the problem, question
the client about the conditions during which the
problem occurred, taking the above conditions into
consideration.  If the CPU cannot be activated, or it fails, the EPS
indicator comes on, but the DTC is not memorized.
 The memory can hold any number of DTCs. However, when the same DTC is detected more than once, the
most recent DTC is written over the prior DTC,
therefore only one occurrence is memorized.
 The lowest DTC is indicated first. The DTCs are indicated in ascending order, not in the order that
they occurred.
 The DTCs are memorized in the EEPROM (non- volatile memory) therefore the memorized DTCs
cannot be erased by disconnecting the battery. Do the
specified procedures to clear the DTCs.
Self-diagnosis can be classified into three categories:  Initial diagnosis: Done right after the engine starts and until the EPS indicator goes off.
 Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK
(0).
 Steering diagnosis: Done during regular diagnosis while turning the steering wheel.
The EPS control unit dose these functions when a
problem is detected by self-diagnosis: 1. Turns on the EPS indicator.
2. Memorizes the DTC.
3. Stops power assist and manual steering operation resumes.
NOTE: For DTCs 11-01, 11-02, 12-01, 21-01, 21-02,
22-01, and 35-04 the EPS indicator will go off
automatically, and the system returns to normal.
(cont’d)
08/08/21 14:53:21 61SNR030_170_0020
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Restriction on Power Assist Operation
Torque Sensor Neutral PositionHow to Troubleshoot DTCs
17-20EPS Components
General Troubleshooting Information (cont’d)
Repeated extreme steering force, such as turning the
steering wheel continuously back-and-forth with the
vehicle stopped, causes an increase of power
consumption in the EPS motor. The increase of electric
current causes the EPS motor to heat up. Because this
heat adversely affects the system, the control unit
monitors the electric current of the EPS motor.
When the control unit detects heat build-up in the EPS
motor, it reduces the electric current to the EPS motor
gradually to protect the system, and it restricts the
power assist operation. The EPS indicator does not
come on during this function.
When steering torque is not applied to the steering
wheel, or when the ignition is turned to LOCK (0) and
the EPS motor cools, the control unit will restore the
power assist gradually until it’s fully restored (after
about 8 minutes).
The EPS control unit stores the torque sensor neutral
position in the EEPROM. The torque sensor neutral
position must be memorized whenever the gearbox, the
EPS motor, or the EPS control unit is replaced.
NOTE: The torque sensor neutral position is not
effected when erasing the DTCs.
The troubleshooting procedures assume that the cause
of the problem is still present and the EPS indicator is
still on. Following the procedure when the EPS
indicator does not come on can result in incorrect
diagnosis.
1. Question the client about the conditions when the problem occurred, and try to reproduce the same
conditions for troubleshooting. Find out when the
EPS indicator came on, such as while turning, after
turning, when the vehicle was at a certain speed,
etc.
2. When the EPS indicator does not come on during the test-drive, but troubleshooting is done based on
the DTC, check for loose connectors, poor terminal
contact, etc., in the affected circuit before you start
troubleshooting.
3. After troubleshooting, clear the DTC and test-drive the vehicle. Be sure the EPS indicator does not
come on.
08/08/21 14:53:58 61SNR030_170_0021
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DTC Detection Item Note
17-23
DTC Troubleshooting Index
11-01 Low/High IG1-terminal Voltage (Initial Diagnosis)
(see page 17-33)
11-02 Low/High IG1-terminal Voltage (Regular Diagnosis) (see page 17-33)
12-01 Low/High VBU Voltage (Regular Diagnosis) (see page 17-34)
21-01 Excessive Change of the Vehicle Speed Signal (Regular Diagnosis) (see page 17-35)
21-02 Comparison between the Vehicle Speed and the Engine Speed Signal (Regular Diagnosis) (see page 17-35)
22-01 Engine Speed Signal (Initial Diagnosis) (see page 17-37)
31-01 No Writing the Torque Sensor Neutral Position (Initial Diagnosis) (see page 17-22)
32-01 EPS Control Unit Internal Circuit (Current Sensor) (Initial Diagnosis) (see page 17-39)
32-02 EPS Control Unit Internal Circuit (Current Sensor) (Regular Diagnosis) (see page 17-39)
32-07 EPS Control Unit Internal Circuit (Current Sensor) (Steering Diagnosis) (see page 17-39)
32-08 Current Sensor (Regular Diagnosis) (see page 17-40)
32-09 Current Sensor (Initial Diagnosis) (see page 17-40)
33-01 Lower FET Stuck ON (Initial Diagnosis) (see page 17-41)
33-02 Upper FET Stuck ON (Initial Diagnosis) (see page 17-43)
33-06 Lower FET Stuck ON (Regular Diagnosis) (see page 17-41)
33-07 Upper FET Stuck ON (Regular Diagnosis) (see page 17-43)
34-01 Power Relay Stuck ON (Ignition Switch is in LOCK (0)) (see page 17-44)
34-02 Fail-safe Relay Stuck ON (Initial Diagnosis) (see page 17-45)
35-01 EPS Control Unit Internal Circuit (CPU) (Initial Diagnosis/Regular Diagnosis) (see page 17-39)
35-02 EPS Control Unit Internal Circuit (EEPROM) (Initial Diagnosis) (see page 17-39)
35-03 EPS Control Unit Internal Circuit (EPS CPU) (Initial Diagnosis) (see page 17-46)
35-04 EPS Control Unit Internal Circuit (CPU Communication) (Regular Diagnosis) (see page 17-39)
35-05 EPS Control Unit Internal Circuit (EPS Motor/EPS CPU) (Initial Diagnosis) (see page 17-46)
35-06 EPS Control Unit Internal Circuit (ITN Communication) (Regular Diagnosis) (see page 17-39)
35-07 EPS Control Unit Internal Circuit (INHL/INHR Ports) (Initial Diagnosis/ Regular Diagnosis) (see page 17-39)
NOTE:  Initial diagnosis: Done right after the engine starts and until the EPS indicator goes off.
 Regular diagnosis: Done right after the initial diagnosis until the ignition switch is turned to LOCK (0).
 Steering diagnosis: Done during regular diagnosis while turning steering wheel.
(cont’d)
08/08/21 14:53:59 61SNR030_170_0024
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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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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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17-68EPS Components
Steering Gearbox Removal and Installation (cont’d)
A
12x1.25mm
B
12 x 1.25 mm
A BA
BB
A
A
VSB02C000016 B
21. Remove the lower ball joint mounting bolt (A) and
the self-locking nuts (B) from the lower arm.
22. Disconnect the lower arm from the lower ball housing.
23. Remove the exhaust hanger (A) from the three way catalytic converter (TWC) (B). 24. Note the reference marks (A) on both sides of the
subframe that line up with the body (B).
25. Attach the front subframe adaptor (VSB02C000016) (A) to the front subframe (B) and the transmission
jack (model number LSL-W9371) or the powertrain
lift (model number OTC-1585), then tighten the
front subframe adaptor screw.
26. Make sure the front subframe is securely supported by the jack with the front subframe adaptor.
Replace. Replace.
08/08/21 14:55:11 61SNR030_170_0069
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