Nissan Sentra. Manual - part 833

EPS CONTROL UNIT

STC-39

< REMOVAL AND INSTALLATION >

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REMOVAL AND INSTALLATION

EPS CONTROL UNIT

Exploded View

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Removal and Installation

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REMOVAL

CAUTION:

• Disconnect battery negative terminal before starting operations.

• Do not shock EPS control unit, e.g. drop or hit.

• Do not get EPS control unit wet with water or other liquid. Also, do not give EPS control unit a radical

temperature change to avoid getting water drops. 

• Do not disassemble or remodel EPS control unit, EPS motor, torque sensor, harness and harness

connectors.

1. Remove steering column assembly. Refer to 

ST-12, "Removal and Installation"

.

2. Disconnect EPS motor harness connector.

CAUTION:

Hold and pull the harness connector housing, not pulling harness, when disconnecting harness

connectors. Also, do not grip, collapse or apply excessive force to the harness connector.

3. Remove EPS control unit from steering column assembly.
4. Remove bracket plate from EPS control unit.

INSTALLATION

Installation is in the reverse order of removal.

• Check that harness is not damaged when installing EPS control unit. Also, check that EPS control unit is

installed without pinching harness or trapping foreign materials.

• After installing steering column assembly, perform self-diagnosis with CONSULT to ensure correct opera-

tion. Refer to 

STC-10, "CONSULT Function"

.

1.

Steering column assembly

2.

EPS control unit

3.

Bracket plate

Front

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ENGINE

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SECTION 

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CONTENTS

STARTING SYSTEM

PRECAUTION ...............................................

3

PRECAUTIONS ...................................................

3

Precaution for Supplemental Restraint System 
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................

3

PREPARATION ............................................

4

PREPARATION ...................................................

4

Special Service Tool  .................................................

4

Commercial Service Tool  ..........................................

4

SYSTEM DESCRIPTION  ..............................

5

COMPONENT PARTS  ........................................

5

STARTING SYSTEM (WITH INTELLIGENT KEY) ......

5

STARTING SYSTEM (WITH INTELLIGENT KEY) 
: Component Parts Location ......................................

5

STARTING SYSTEM (WITH INTELLIGENT KEY) 
: Component Description ..........................................

5

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) .............................................................................

6

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) : Component Parts Location  ............................

6

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) : Component Description  ................................

6

SYSTEM ..............................................................

8

STARTING SYSTEM (WITH INTELLIGENT KEY) ......

8

STARTING SYSTEM (WITH INTELLIGENT KEY) 
: System Diagram ......................................................

8

STARTING SYSTEM (WITH INTELLIGENT KEY) 
: System Description  .................................................

8

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) .............................................................................

8

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) : System Diagram  ............................................

9

STARTING SYSTEM (WITHOUT INTELLIGENT 
KEY) : System Description  .......................................

9

WIRING DIAGRAM ......................................

10

STARTING SYSTEM (WITH INTELLIGENT 
KEY) ..................................................................

10

Wiring Diagram ........................................................

10

STARTING SYSTEM (WITHOUT INTELLI-
GENT KEY)  .......................................................

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Wiring Diagram ........................................................

15

BASIC INSPECTION  ...................................

20

DIAGNOSIS AND REPAIR WORKFLOW  ........

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Work Flow (With GR8-1200 NI) ...............................

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Work Flow (Without GR8-1200 NI) ..........................

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DTC/CIRCUIT DIAGNOSIS  .........................

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B TERMINAL CIRCUIT  .....................................

26

Description ...............................................................

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Diagnosis Procedure  ...............................................

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S CONNECTOR CIRCUIT .................................

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Description ...............................................................

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Diagnosis Procedure  ...............................................

28

SYMPTOM DIAGNOSIS  ..............................

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STARTING SYSTEM .........................................

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Symptom Table  .......................................................

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REMOVAL AND INSTALLATION ...............

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STARTER MOTOR  ...........................................

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Exploded View .........................................................

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Removal and Installation  .........................................

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SERVICE DATA AND SPECIFICATIONS 
(SDS) ............................................................

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SERVICE DATA AND SPECIFICATIONS 
(SDS) ..................................................................

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Starter Motor ..........................................................

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PRECAUTIONS

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< PRECAUTION >

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PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

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The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. Information necessary to service the system safely is included in the SR and SB section of

this Service Manual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery and wait at least three minutes before performing any service.