Nissan Altima HL32 Hybrid. Manual - part 1069

NORMAL OPERATING CONDITION

STC-55

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NORMAL OPERATING CONDITION

Description

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PROTECT OVERLOAD STATUS

• While stopping or driving, EPS control unit decreases the output to EPS motor while extremely using the

power steering function (e.g., full steering) for protecting EPS motor and EPS control unit (Protect overload

status). While activating protect overload status, the assist torque gradually decreases, and the steering

wheel turning force becomes heavy. The normal assist torque reactivates by not steering for approximately

10 minutes in ignition switch OFF state.

STC-56

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PRECAUTIONS

PRECAUTION

PRECAUTIONS

Precautions For High-Voltage System

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Refer to 

GI-24, "Precautions For High-Voltage System"

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Precautions for Inspecting the Hybrid Control System

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• Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with

converter assembly, take safety precautions, such as wearing insulated gloves and removing the service

plug grip to prevent electrical shocks. Make sure to turn the ignition switch OFF before removing the service

plug grip. After removing the service plug grip, put it in your pocket to prevent other technicians from acci-

dentally reconnecting it while you are working on the high-voltage system.

NOTE:

Turning the ignition switch ON (READY) with the service plug grip removed could cause a malfunc-

tion. Do not turn the ignition switch ON (READY) unless instructed by the service manual.

• After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage

connectors or terminals.

NOTE:

Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with

converter assembly.

• Turn the ignition switch OFF, wear insulated gloves, and disconnect the negative terminal of the auxiliary

battery before touching any of the orange-colored wires of the high-voltage system.

• Turn the ignition switch OFF before performing any resistance checks.

• Turn the ignition switch OFF before disconnecting or reconnecting any connectors.

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. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the “SRS AIRBAG” and “SEAT BELT” 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 “SRS AIRBAG”.

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PRECAUTIONS

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• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-

vice Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness

connectors.

Service Notice or Precautions for EPS System

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CAUTION:

Check the following item when performing the trouble diagnosis.

• Check any possible causes by interviewing the symptom and it

′s condition from the customer if any

malfunction, such as EPS warning lamp is turned ON, occurs.

• Check if air pressure and size of tires are proper, the specified part is used for the steering wheel,

and control unit is genuine part.

• Check if the connection of steering column assembly and steering gear assembly is proper (there is

not looseness of mounting bolts, damage of rods, boots or sealants, and leakage of grease, etc.).

• Check if the wheel alignment is adjusted properly.

• Check if there is any damage or modification to suspension or body resulting in increased weight or

altered ground clearance.

• Check if installation conditions of each link and suspension are proper.

• Check if the 12-volt battery voltage is proper.

• Check connection conditions of each connector are proper.

• Before connecting or disconnecting the EPS control unit har-

ness connector, turn ignition switch “OFF” and disconnect

12-volt battery negative terminal. Because 12-volt battery volt-

age is applied to EPS control unit even if ignition switch is

turned “OFF”.

• When connecting or disconnecting pin connectors into or

from EPS control unit, take care not to damage pin terminals

(bend or break).

When connecting pin connectors, make sure that there are no

bends or breaks on EPS control unit pin terminal.

• Before replacing EPS control unit, perform EPS control unit

input/output signal inspection and make sure whether EPS

control unit functions properly or not. Refer to 

STC-43, "Ref-

erence Value"

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• If EPS control unit is replaced, always install new one.

- Once EPS control unit is used, it stores vehicle's data, which

are non-erasable. Never use EPS control unit of other vehi-

cles.

• Perform EPS motor angle sensor initialization and torque sen-

sor calibration when replacing EPS control unit. Refer to 

STC-

5, "EPS MOTOR ANGLE SENSOR INITIALIZATION AND

TORQUE SENSOR CALIBRATION : Special Repair Require-

ment"

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< ON-VEHICLE REPAIR >

EPS CONTROL UNIT

ON-VEHICLE REPAIR

EPS CONTROL UNIT

Exploded View

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Removal and Installation

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Removal

1. Remove the engine cover.
2. Remove the front wiper arm cover and wiper arm and blade assembly. Refer to  

WW-92, "FRONT WIPER

DRIVE ASSEMBLY : Removal and Installation"

3. Remove the cowl top weatherstrip. 
4. Remove the cowl top end caps. Refer to 

EXT-17, "Removal and Installation"

5. Remove the cowl top finisher assembly. Refer to 

EXT-17, "Removal and Installation"

6. Disconnect the washer hose.
7. Remove the strut brace. 

1.

EPS control unit

2.

EPS DC/DC converter connector

3.

EPS sensor connector

4.

EPS motor connector

⇐: Front

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