Honda Civic. Manual — part 506

SYMPTOM TROUBLESHOOTING INDEX

SYMPTOM TROUBLESHOOTING INDEX

SYSTEM DESCRIPTION

EPS CONTROL UNIT INPUTS AND OUTPUTS FOR CONNECTOR A (2P)

SIN/COS) (Initial diagnosis)

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 off.

Steering diagnosis: Done during regular diagnosis
while turning steering wheel.

Symptom

Diagnostic procedure

EPS indicator does not come
on

Symptom Troubleshooting (see EPS
INDICATOR DOES NOT COME ON )

EPS indicator does not go
off, and no DTCs are stored

Symptom Troubleshooting (see EPS
INDICATOR DOES NOT GO OFF, AND
NO DTCS ARE STORED )

EPS indicator is not on, no
DTCs are stored, but there is
no power assist or power
assist is down

1. Check the motor power wires between the

EPS control unit and the motor for a short
to body ground. Repair as needed.

2. If the motor power wires are OK, replace

the motor (short in the motor) (see
MOTOR REMOVAL AND
INSTALLATION ).

3. Check the power and ground connections at

the EPS control unit.

HDS does not communicate
with the EPS control unit or
the vehicle

Troubleshoot the DLC circuit (see DLC
CIRCUIT TROUBLESHOOTING ).

2008 Honda Civic EX

2006-08 STEERING EPS System - Civic (All Except Hybrid & Si)

Fig. 5: Identifying EPS Control Unit Inputs And Outputs For Connector A
(2P)

SYSTEM DESCRIPTION

EPS CONTROL UNIT INPUTS AND OUTPUTS FOR CONNECTOR B (2P)

Fig. 6: Identifying EPS Control Unit Inputs And Outputs For Connector B
(2P)

TERMINAL NUMBER REFERENCE

Terminal

number

Wire
color

Terminal

sign

(Terminal

name)

Description

Signal

Terminals Conditions Voltage

1

BLK

PG (Power
ground)

Ground for the
actuator motor

-

-

-

2

WHT

+B (Plus
battery)

Power source
for the
actuator motor

2-GND

At all times

Battery
voltage

Terminal

number

Wire
color

Terminal

sign

(Terminal

name)

Description

Signal

Terminals Conditions Voltage

2008 Honda Civic EX

2006-08 STEERING EPS System - Civic (All Except Hybrid & Si)

EPS CONTROL UNIT INPUTS AND OUTPUTS FOR CONNECTOR C (2P)

Fig. 7: Identifying EPS Control Unit Inputs And Outputs For Connector C
(2P)

TERMINAL NUMBER REFERENCE

EPS CONTROL UNIT INPUTS AND OUTPUTS FOR CONNECTOR D (28P)

Fig. 8: Identifying EPS Control Unit Inputs And Outputs For Connector D
(28P)

1

GRIM H-W

Drives the
actuator
motor

-

-

-

Terminal

number

Wire
color

Terminal

sign

(Terminal

name)

Description

Signal

Terminals Conditions Voltage

1

RED H-U

Drives the
actuator
motor

-

-

-

2

BLU H-V

Drives the
actuator
motor

-

-

-

2008 Honda Civic EX

2006-08 STEERING EPS System - Civic (All Except Hybrid & Si)

TERMINAL NUMBER REFERENCE

Terminal

number

Wire
color

Terminal

sign

(Terminal

name)

Description

Signal

Terminals Conditions Voltage

1

WHT

CAN-H
(CAN-HI)

CAN
communication
circuit

-

-

-

3

BLU

NEP
(Engine
pulse)

Detects
tachometer
signal

3-GND

With
engine
running

3 V or
less-6 V
or more

7

BRN

SCS
(Service
check
signal)

Detects service
check connector
signal

7-GND

SCS not
grounded

About 5
V

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 (Motor
angle
sensor 1)

Detects motor
angle sensor
signal

-

-

-

14

BRN

S2 (Signal
2)

Detects motor
angle sensor
signal

-

-

-

CAN-L

CAN

2008 Honda Civic EX

2006-08 STEERING EPS System - Civic (All Except Hybrid & Si)