Nissan Cube. Instruction — part 920
STC-1
STEERING
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SECTION
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CONTENTS
STEERING CONTROL SYSTEM
PRECAUTION . . . . . . . . . . . ...
PRECAUTIONS . . . . . . . . . . . . ...
Precautions for Removing of Battery Terminal . .....
Service Notice and Precautions for EPS System . ..
SYSTEM DESCRIPTION . . . . . . . ..
COMPONENT PARTS . . . . . . . . . .
Component Parts Location . . . . . . . . . ....
Component Description . . . . . . . . . . .....
EPS Control Unit . . . . . . . . . . . . . ...
EPS Motor . . . . . . . . . . . . . . . .....
Torque Sensor . . . . . . . . . . . . . . ..
Reduction Gear . . . . . . . . . . . . . .....
SYSTEM . . . . . . . . . . . . . . . ..
EPS SYSTEM . . . . . . . . . . . . . . . ..
EPS SYSTEM : System Description . . . . . .....
EPS SYSTEM : Fail-Safe . . . . . . . . . . ..
EPS SYSTEM : Protection Function . . . . . .....
DIAGNOSIS SYSTEM (EPS CONTROL UNIT)
. .
CONSULT Function . . . . . . . . . . . . ..
ECU DIAGNOSIS INFORMATION . . . ..
EPS CONTROL UNIT . . . . . . . . . . .
Reference Value . . . . . . . . . . . . . .
Fail-Safe . . . . . . . . . . . . . . . . ..
Protection Function . . . . . . . . . . . . .
DTC Inspection Priority Chart . . . . . . . . .
DTC Index . . . . . . . . . . . . . . . ...
WIRING DIAGRAM . . . . . . . . . ..
ELECTRONICALLY CONTROLLED POWER
STEERING SYSTEM . . . . . . . . . . .
Wiring Diagram . . . . . . . . . . . . . .
BASIC INSPECTION . . . . . . . . ...
DIAGNOSIS AND REPAIR WORKFLOW . .
Work Flow . . . . . . . . . . . . . . . .
Diagnostic Work Sheet . . . . . . . . . . .
DTC/CIRCUIT DIAGNOSIS . . . . . . .
C1601 BATTERY POWER SUPPLY . . . .
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
C1604 TORQUE SENSOR . . . . . . . .
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
C1606 EPS MOTOR . . . . . . . . . . ..
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
Component Inspection . . . . . . . . . . . .
C1607, C1608 EPS CONTROL UNIT . . . ...
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
C1609 VEHICLE SPEED SIGNAL . . . . .
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
U1000 CAN COMM CIRCUIT . . . . . . ...
Description . . . . . . . . . . . . . . . ...
DTC Logic . . . . . . . . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
EPS WARNING LAMP . . . . . . . . . ..
Component Function Check . . . . . . . . .
Diagnosis Procedure . . . . . . . . . . . ...
STC-2
EPS WARNING LAMP DOES NOT TURN ON ...
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ..
EPS WARNING LAMP DOES NOT TURN
OFF . . . . . . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ..
STEERING WHEEL TURNING FORCE IS
HEAVY OR LIGHT . . . . . . . . . . . .
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ..
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) . . . . . ...
Description . . . . . . . . . . . . . . . ..
Diagnosis Procedure . . . . . . . . . . . ...
REMOVAL AND INSTALLATION . . . ..
EPS CONTROL UNIT . . . . . . . . . .
Exploded View . . . . . . . . . . . . . .
PRECAUTIONS
STC-3
< PRECAUTION >
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000009945951
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 AIR BAG” and “SEAT BELT” of this
Instruction.
WARNING:
Always observe the following items for preventing accidental activation.
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision that 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 “SRS AIR BAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Ser-
vice Instruction. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
Always observe the following items for preventing accidental activation.
• When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the
ignition ON or engine running, never 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 3 minutes before performing any service.
Precautions for Removing of Battery Terminal
INFOID:0000000010195704
• When removing the 12V battery terminal, turn OFF the ignition
switch and wait at least 30 seconds.
NOTE:
ECU may be active for several tens of seconds after the ignition
switch is turned OFF. If the battery terminal is removed before ECU
stops, then a DTC detection error or ECU data corruption may
occur.
• For vehicles with the 2-batteries, be sure to connect the main bat-
tery and the sub battery before turning ON the ignition switch.
NOTE:
If the ignition switch is turned ON with any one of the terminals of
main battery and sub battery disconnected, then DTC may be
detected.
• After installing the 12V battery, always check "Self Diagnosis Result" of all ECUs and erase DTC.
NOTE:
The removal of 12V battery may cause a DTC detection error.
Service Notice and Precautions for EPS System
INFOID:0000000009945952
• 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 malfunc-
tion, such as EPS warning lamp is turned ON, occurs.
SEF289H
STC-4
< PRECAUTION >
PRECAUTIONS
- Check if air pressure and size of tires are proper, the specified part is used for the steering wheel, and con-
trol 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 battery voltage is proper.
- Check connection conditions of each connector are proper.
- Before connecting or disconnecting the EPS control unit harness
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.
• During quick steering, rasping noise may be heard from around the
steering wheel. This is not a malfunction. The noise is an operating
noise of the EPS system under normal conditions. If the rasping
noise occurs during slow steering, this may not be an operating
noise of the system. In this case, it is necessary to find out the
location of the noise and repair, if necessary.
SEF289H
SEF291H
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