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Nissan Tiida C11. Manual - part 1228

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIATION)

STC-35

< SYMPTOM DIAGNOSIS >

[EPS]

STC

UNBALANCE STEERING WHEEL TURNING FORCE (TORQUE VARIA-
TION)

Diagnosis Procedure

INFOID:0000000001697737

SYMPTOM:

Unbalance steering wheel turning force, while driving (Torque variation).

DIAGNOSTIC PROCEDURE

CHECK EPS WARNING LAMP

Confirm EPS warning lamp during engine running.
Does EPS warning lamp turn OFF?

YES

>> GO TO 2.

>> Go to

STC-31, "Diagnosis Procedure"

CHECK STEERING COLUMN INTERMEDIATE SHAFT

Check the connection between intermediate shaft and the mounting part of steering column assembly and
steering gear assembly. Refer to

ST-9, "Removal and Installation"

OK or NG

>> GO TO 3.

>> Repair or replace damaged parts.

CHECK EPS CONTROL UNIT

Check EPS control unit input/output signal. Refer to

STC-22, "EPS Control Unit Input/Output Signal Reference

Value"

OK or NG

>> GO TO 4.

>> Check EPS control unit pin terminals for damage or loose connection with harness connector. If

any items are damaged, repair or replace damaged parts.

SYMPTOM CHECK

Check again.

OK or NG

>> INSPECTION END

>> Check the steering wheel turning force because there may be mechanical malfunction. Refer to

ST-6, "On-Vehicle Inspection and Service"

STC-36

< PRECAUTION >

[EPS]

PRECAUTIONS

PRECAUTION

PRECAUTIONS

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

INFOID:0000000001697712

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.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000001716731

NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″

LOCK

″

position.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.

OPERATION PROCEDURE

Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged.

Use the Intelligent Key or mechanical key to turn the ignition switch to the

″

ACC

″

position. At this time, the

steering lock will be released.

Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.

Perform the necessary repair operation.

When the repair work is completed, return the ignition switch to the

″

LOCK

″

position before connecting

the battery cables. (At this time, the steering lock mechanism will engage.)

Perform a self-diagnosis check of all control units using CONSULT-III.

Service Notice or Precaution for EPS System

INFOID:0000000001697713

CAUTION:

Check or confirm 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 turns 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.

PRECAUTIONS

STC-37

< PRECAUTION >

[EPS]

STC

• 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 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
battery ground cable. Because battery voltage 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-22, "EPS

Control Unit Input/Output Signal Reference Value"

SEF289H

SEF291H

SDIA1848E

STR-1

ENGINE