Acura CSX. Manual — part 339

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ＳＮＲ９Ａ００Ｆ１８１００００００００ＥＡＡＴ００

17-30

EPS 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

ORN

LT 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)

IG1

1

2

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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

5 V
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

PVF

VS2

1

2

3

G402

G403

: 12 V
: 5 V

*1: ’06 model
*2: ’07-09 models

1

2

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０１

17-32

EPS Components

EPS CONTROL UNIT
CONNECTOR A (2P)

EPS CONTROL UNIT
CONNECTOR B (2P)

DATA LINK CONNECTOR (DLC)

GAUGE CONTROL MODULE (TACH) 36P CONNECTOR

UNDER-DASH FUSE/RELAY BOX CONNECTOR F (34P)

EPS CONTROL UNIT
CONNECTOR D (28P)

EPS CONTROL UNIT
CONNECTOR C (2P)

TORQUE SENSOR
3P CONNECTOR

UNDER-DASH FUSE/RELAY BOX
CONNECTOR Q (16P)

UNDER-HOOD FUSE/RELAY BOX
CONNECTOR B (1P)

ECM/PCM CONNECTOR A (44P)

EPS MOTOR 1P
CONNECTOR

EPS MOTOR 2P
CONNECTOR

EPS MOTOR ANGLE
SENSOR 6P CONNECTOR

Wire side of female terminals

Wire side of female terminals

Terminal side of male terminals

Terminal side of female terminals

Wire side of female terminals

Wire side of female terminals

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ＳＮＲ９Ａ００Ｋ７２２０００Ｒ１１０１ＦＡＡＴ０１

−

−

−

−

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

1

2

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
the wire between the No. 4 (7.5 A) fuse in the
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 terminals

Does the EPS indicator come on?

Is ther e batter y voltage?

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