Battery ACURA CSX 2006 Service Repair Manual

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17-18EPS Components
Component Location Index
STEERING GEARBOX
EPS MOTOR
BATTERY
DATA LINK
CONNECTOR (DLC)
GAUGE CONTROL
MODULE (TACH)
UNDER-HOOD
FUSE/RELAY BOX
UNDER-DASH
FUSE/RELAY BOX
EPS CONTROL UNIT
EPS INDICATORRemoval and Installation, page 17-65
Rack End Removal and Installation, page 17-79
Rack Guide Removal/Installation, page 17-83
Removal/Installation,
page 17-63
Removal/Installation, page 17-84
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17-8 Steering
Steering Wheel Installation
A
B
A D
B
C A
39 N·m
(4.0 kgf·m,
29 lbf·ft)
B
1. Before installing the steering wheel, make sure the front wheels are aligned straight ahead, then center
the cable reel (A). Do this by first rotating the cable
reel clockwise until it stops. Then rotate it
counterclockwise about three full turns. The arrow
mark (B) on the cable reel label should point
straight up.
2. Position the two tabs (A) of the turn signal canceling sleeve (B) as shown. Install the steering
wheel on to the steering column shaft, making sure
the steering wheel hub (C) engages the pins (D) of
the cable reel and tabs of the turn signal canceling
sleeve. Do not tap on the steering wheel or steering
column shaft when installing the steering wheel. 3. Install the steering wheel bolt (A), and tighten it to
the specified torque. Connect the cable reel
subharness connector (B). Make sure the wire
harness is routed and fastened properly.
4. Install the driver’s airbag, and confirm that the system is operating properly (see page 24-188).
5. 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 is centered.
6. After installation, check the steering wheel spoke angle. If the steering spoke angles to the right and
left are not equal (steering wheel is not centered),
correct the engagement of the wheel/column shaft
serrations.
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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)
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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)
Terminalnumber Wire color Terminal sign Description Signal
Terminal number Wire color Terminal sign Description Signal
Terminal number Wire color Terminal sign Description Signal
17-26EPS Components
System Description
NOTE: Standard battery voltage is 12 V.
1BLKPG (Power ground) Ground for the actuator EPS
motor Continuity to ground
2WHTB (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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EPS Control Unit Inputs and Outputs for Connector D (28P) (Connector disconnected)
Terminalnumber Wire color Terminal sign Description Signal
17-27
NOTE: Standard battery voltage is 12 V.
1WHTCAN-H (CAN-HI) CAN communication circuit
3BLUNEP (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 GRYIG1
(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
(cont’d)
12
Wire side of female terminals
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17-30EPS Components
Circuit Diagram
BATTERY
GAUGE CONTROL
MODULE (TACH) IGNITION
SWITCH
WHT
UNDER-HOOD
FUSE/RELAY BOX
BRN
BLU UNDER-DASH
FUSE/RELAY BOX
DATA LINK
CONNECTOR (DLC) EPS
INDICATOR
BRN
WHT
RED
BLU
WHT
RED
WHT
RED
ORNLT BLU WHT
ECM/PCM
BRN
3
6 F16
Q9
IG1 HOT in ON (II)
and START (III) D2
B1
H1 YEL*
GRY*
No. 10 (7.5 A)
No. 2 (50 A)
No. 4 (7.5 A)
CAN-H 17
1
19
CAN-L IG1
CAN-H A28
A36
A37
CAN-L NEP
CAN-L 6
14
9
SCS
CAN-H
7
K-LINE
No. 1 (70 A)
No. 1 (100 A)
IG11 2
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DTC 11-01:
DTC 11-02:
YES
NO YES
NO
17-33
DTC Troubleshooting
EPS CONTROL UNIT CONNECTOR D (28P)
IG1 (YEL)* (GRY)*
*1: ’06 model
*2: ’07-09 models
12
Low/High IG1-terminal Voltage
(Initial Diagnosis)
Low/High IG1-terminal Voltage
(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. Wait at least 60 seconds.
Go to step 6.
Check for loose terminals or poor connections.
If the connections are good, the system is OK at
this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector D (28P). 8. Turn the ignition switch to ON (II).
9. Wait at least 60 seconds.
10. Measure the voltage between EPS control unit connector D (28P) terminal No. 16 and body ground.
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).
If there is no voltage, or the voltage is lower
than specified, repair an open or high resistance in
thewirebetweentheNo.4(7.5A)fuseinthe
under-dash fuse/relay box and the EPS control unit.
If the wire checks OK, check the battery (see page
22-67), and troubleshoot the alternator regulator
circuit (see page 4-28).
Wire side of female terminalsDoes t he E PS i nd i cat or come on?
Is there battery voltage?
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DTC 12-01:
YES
NO
YES
NO
YES
NO YES
NO
YES
NO
17-34
EPS Components
DTC Troubleshooting (cont’d)
B(WHT)
EPS CONTROL UNIT CONNECTOR A (2P) EPS CONTROL UNIT CONNECTOR A (2P)
B(WHT)
Low/High VBU Voltage (Regular
Diagnosis)
1. Turn the ignition switch to ON (II).
2. Check the BATTERY in the EPS DATA LIST with the
HDS.
Check for loose terminals or poor
connections. If the connections are good, the
system is OK at this time.
Go to step 3.
3. Turn the ignition switch to LOCK (0).
4. Check the No. 1 (70 A) fuse in the under-hood fuse/ relay box.
Reinstall the checked fuse, then go to step
13.
Go to step 5.
5. Disconnect the EPS control unit connector A (2P).
6. Check for continuity between EPS control unit connector A (2P) terminal No. 2 and body ground.
Repair short to body ground in the wire
between the EPS control unit and the No. 1 (70 A)
fuse in the under-hood fuse/relay box.
Install a new No. 1 (70 A) fuse in the under-
hood fuse/relay box, then go to step 7. 7. Reconnect the EPS control unit connector A (2P).
8. Turn the ignition switch to ON (II).
9. Clear the DTC with the HDS.
10. Turn the ignition switch to LOCK (0).
11. Start the engine.
12. Check for DTCs with the HDS.
Replace the EPS control unit (see page 17-84).
Troubleshooting is complete. If any other
DTCs are indicated, go to the indicated DTC’s
troubleshooting.
13. Disconnect EPS control unit connector A (2P) and connector D (28P).
14. Measure the voltage between EPS control unit connector A (2P) terminal No. 2 and body ground.
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).
Repair open in the wire between the EPS
control unit and the No. 1 (70 A) fuse in the under-
hood fuse/relay box.
Wire side of female terminals Wire side of female terminals
Is the voltage at 9.2 17.4 V ?
IsthefuseOK?
Is there continuity? Is DTC 12-01 indicated?
Is there battery voltage?
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DTC 33-02:
DTC 33-07:
YES
NO
YES
NO
YES
NO
17-43
EPS CONTROL UNIT CONNECTOR B (2P)H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (BLU)
Upper FET Stuck ON (Initial
Diagnosis)
Upper FET Stuck ON (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.
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.
Go to step 6.
Troubleshoot the indicated DTC. If there are
no DTCs, the system is OK at this time.
6. Turn the ignition switch to LOCK (0).
7. Disconnect EPS control unit connector B (2P) and connector C (2P).
8. Turn the ignition switch to ON (II). 9. Measure the voltage between body ground and
EPS control unit connector B (2P) terminal No. 1,
connector C (2P) terminal No. 1, and connector C
(2P) terminal No. 2 individually.
Go to step 10.
Check for loose terminals in the EPS control
unit connectors and the EPS motor connectors, and
repair if necessary. If no poor connections are
found, replace the EPS control unit (see page 17-84).
10. Turn the ignition switch to LOCK (0).
(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 33-02 or 33-07 ind icated ? Is there battery voltage?
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YES
NO YES
NO
YES
NO
DTC 34-01:
17-4417-44EPS Components
DTC Troubleshooting (cont’d)
EPS CONTROL UNIT CONNECTOR B (2P)
H-W (GRN)
EPS CONTROL UNIT CONNECTOR C (2P) H-U (RED) H-V (BLU)
11. Disconnect the EPS motor 1P connector and EPSmotor 2P connector.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between body ground and EPS control unit connector B (2P) terminal No. 1,
connector C (2P) terminal No. 1, and connector C
(2P) terminal No. 2 individually.
Repair short to power in the wire between
the EPS control unit and the EPS motor.
Short to power in the EPS motor wire; or a
short in the 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. Turn the ignition switch to ON (II).
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.Power Relay Stuck ON (Ignition
Switch is in LOCK (0))
Wire side of female terminals
Wire side of female terminals
Is there battery voltage? Does t he E PS i nd i cat or come on?
Is DTC 34-01 indicated?
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