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STC

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G STEERING

SECTION
STEERING CONTROL SYSTEM
STC B

E
CONTENTS
EPS TROUBLE DIAGNOSIS FOR SYSTEM ................... 15 . F
DTC C1601 BATTERY VOLT ................................ 15 .
PRECAUTIONS ......................................................... 3 . CONSULT-III REFERENCE VALUE IN DATA
Precautions for Supplemental Restraint System MONITOR MODE ............................................... 15
. STC
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- TERMINALS AND REFERENCE VALUES FOR
SIONER" ................................................................. 3
. EPS CONTROL UNIT ........................................ 15 .
Precautions Necessary for Steering Wheel Rotation DIAGNOSTIC PROCEDURE ............................. 15 .
After Battery Disconnect ......................................... 3 . H
DTC C1604 TORQUE SENSOR ........................... 16 .
OPERATION PROCEDURE ................................ 3 . CONSULT-III REFERENCE VALUE IN DATA
Service Notice or Precautions for EPS System ...... 4 . MONITOR MODE ............................................... 16
.
EPS SYSTEM ............................................................ 5
. TERMINALS AND REFERENCE VALUES FOR I
System Description ................................................. 5 . EPS CONTROL UNIT ........................................ 16 .
EPS CONTROL UNIT .......................................... 5 . DIAGNOSTIC PROCEDURE ............................. 16 .
EPS MOTOR ........................................................ 5 . DTC C1606 EPS MOTOR ..................................... 17 . J
TORQUE SENSOR .............................................. 5 . DIAGNOSTIC PROCEDURE ............................. 17 .
REDUCTION GEAR ............................................. 5 . DTC C1608 CONTROL UNIT ................................ 17 .
EPS WARNING LAMP ......................................... 5 . DIAGNOSTIC PROCEDURE ............................. 17 .
System Diagram ...................................................... 6. K
DTC U1000 CAN COMM CIRCUIT ....................... 18 .
COMPONENTS FUNCTION DESCRIPTION ...... 6 . DIAGNOSTIC PROCEDURE ............................. 18 .
CAN Communication ............................................... 6 . DTC U1200 CAN VHCL SPEED ABS ................... 18 .
SYSTEM DESCRIPTION ..................................... 6 . CONSULT-III REFERENCE VALUE IN DATA L
TROUBLE DIAGNOSIS ............................................. 7 . MONITOR MODE ............................................... 18
.
Fail-Safe Function ................................................... 7
. DIAGNOSTIC PROCEDURE ............................. 18 .
How to Perform Trouble Diagnosis ......................... 7 . TROUBLE DIAGNOSIS FOR SYMPTOMS ............. 19 . M
BASIC CONCEPT ................................................ 7 . EPS Warning Lamp Does Not Turn ON ................ 19 .
PRECAUTIONS FOR TROUBLE DIAGNOSIS ..... 7 SYMPTOM: ........................................................ 19
.
INTERVIEW ......................................................... 7. DIAGNOSTIC PROCEDURE ............................. 19 .
Component Parts Location ...................................... 8 . EPS Warning Lamp Does Not Turn OFF ............... 20 .
Wiring Diagram -- EPS -- ...................................... 9 . SYMPTOM: ........................................................ 20
.
EPS Control Unit Input/Output Signal Reference DIAGNOSTIC PROCEDURE ............................. 20 .
Values ....................................................................11
. Steering Wheel Turning Force is Heavy or Light ... 22
SPECIFICATIONS WITH CONSULT-III ..............11 . SYMPTOM: ........................................................ 22
.
SPECIFICATIONS WITH CONSULT-III ..............11 . DIAGNOSTIC PROCEDURE ............................. 22 .
TERMINALS AND REFERENCE VALUES FOR Unbalance Steering Wheel Turning Force and
EPS CONTROL UNIT ........................................ 12 . Return Between Right and Left ............................. 24 .
CONSULT-III Function (EPS) ................................ 13 . SYMPTOM: ........................................................ 24
.
FUNCTION ......................................................... 13. DIAGNOSTIC PROCEDURE ............................. 24 .
SELF-DIAG RESULTS MODE ........................... 13 . Unbalance Steering Wheel Turning Force (Torque
DATA MONITOR ................................................ 13 .
Symptom Chart ..................................................... 14 .

Revision: December 2006 STC-1 2007 Sentra
Variation) ............................................................... 25
.
SYMPTOM: ........................................................ 25 .
DIAGNOSTIC PROCEDURE ............................. 25 .

Revision: December 2006 STC-2 2007 Sentra
PRECAUTIONS
[EPS]
PRECAUTIONS PFP:00001
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" UGS000CF

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 C
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 and SB section of this Service Man-
ual.
WARNING: D
G 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 per-
formed by an authorized NISSAN/INFINITI dealer. E
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
G 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
harness connectors. STC
Precautions Necessary for Steering Wheel Rotation After Battery Disconnect
UGS000CG

NOTE: H
G This Procedure is applied only to models with Intelligent Key system and NVIS/IVIS (NISSAN/INFINITI
VEHICLE IMMOBILIZER SYSTEM - NATS).
G Remove and install all control units after disconnecting both battery cables with the ignition knob in the I
LOCK position.
G 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.
J
For models equipped with the Intelligent Key system and NVIS/IVIS, an electrically controlled steering lock
mechanism 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. K
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE L
1. Connect both battery cables.
NOTE:
Supply power using jumper cables if battery is discharged. M
2. 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.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
5. 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.)
6. Perform a self-diagnosis check of all control units using CONSULT-III.

Revision: December 2006 STC-3 2007 Sentra
PRECAUTIONS
[EPS]
Service Notice or Precautions for EPS System UGS0008F

CAUTION:
Check or confirm the following item when performing the trouble diagnosis.
G 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.
G 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.
G 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).
G Check if the wheel alignment is adjusted properly.
G Check if there is any damage or modification to suspension or body resulting in increased weight
or altered ground clearance.
G Check if installation conditions of each link and suspension are proper.
G Check if the battery voltage is proper
G Check connection conditions of each connector are proper.
G Before connecting or disconnecting the EPS control unit
harness connector, turn ignition switch "OFF" and discon-
nect battery ground cable. Because battery voltage is
applied to EPS control unit even if ignition switch is turned
"OFF".

SEF289H

G When connecting or disconnecting pin connectors into or
from EPS control unit, take care not to damage pin termi-
nals (bend or break).
When connecting pin connectors, make sure that there are
no bends or breaks on EPS control unit pin terminal.

SEF291H

G 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-11,
"EPS Control Unit Input/Output Signal Reference Values" .

SDIA1848E

Revision: December 2006 STC-4 2007 Sentra
EPS SYSTEM
[EPS]
EPS SYSTEM PFP:28500
A
System Description UGS000A5

EPS CONTROL UNIT
G EPS control unit performs an arithmetical operation on data, B
such as steering wheel turning force (sensor signal) from the
torque sensor, vehicle speed signal, etc. Then it generates an
optimum assist torque to the EPS motor according to the driving
condition. C
G 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 D
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 SGIA1699E
E
steering.
G In case of an error in the electrical system, the fail-safe function stops output signals to the EPS motor.
Then the previous state is changed to the manual steering state.
F
G Self-diagnosis can be done with CONSULT-III.
EPS MOTOR
EPS motor provides the assist torque by control signal from EPS control unit. STC
TORQUE SENSOR
Torque sensor detects the steering torque, and transmit the signal to
EPS control unit. H

SGIA1700E
K
REDUCTION GEAR
Reduction gear increases the assist torque provided from EPS motor with worm gears, and outputs to the col-
umn shaft. L
EPS WARNING LAMP
Turns ON when there is a malfunction in EPS system. It indicates that fail-safe mode is engaged and enters a
manual steering state (Control turning force steering wheel becomes heavy). M
Also turns ON when ignition switch is turned ON, for purpose of lamp check. Turns OFF after the engine starts
if system is normal.
EPS Warning Lamp Indication
Condition EPS warning lamp
Turns ON when ignition switch is turned ON.
Lamp check
Turns OFF after engine start.
EPS system malfunction ON
Other than above (system normal) OFF

Revision: December 2006 STC-5 2007 Sentra
EPS SYSTEM
[EPS]
System Diagram UGS000A6

SGIA1701E

COMPONENTS FUNCTION DESCRIPTION
Component parts Function
G Outputs optimum assist torque signal to EPS motor.
G Reduces output signals to EPS motor and protects EPS motor and EPS control unit when
EPS control unit using power steering continuously and excessively.
(Electric power steering control unit) G As a fail-safe function, turned off output signal to EPS motor and then enters a manual steer-
ing state, if malfunction is detected in EPS system.
G Self-diagnosis can be clone with CONSULT-III.
EPS motor Products assist torque by control signal from EPS control unit.
Torque sensor Detects steering wheel turning force and outputs sensor signal to EPS control unit.
Reduction gear Increases motor-produced assist torque by worm gear and transmits it to column shaft.
EPS warning lamp Illuminates if malfunction is detected in electrical system of EPS system.
Transmits the following signals via CAN communication to EPS control unit.
ECM
G Engine status signal

ABS actuator and electric unit (con- Transmits the following signals via CAN communication to EPS control unit.
trol unit) (With ABS) G Vehicle speed signal
Transmits the following signals via CAN communication to EPS control unit.
Combination meter
G Vehicle speed signal

CAN Communication UGS000A7

SYSTEM DESCRIPTION
Refer to LAN-4, "SYSTEM DESCRIPTION" .

Revision: December 2006 STC-6 2007 Sentra
TROUBLE DIAGNOSIS
[EPS]
TROUBLE DIAGNOSIS PFP:00004
A
Fail-Safe Function UGS0008G

G If any malfunction occurs in the system, and control unit detects the malfunction, EPS warning lamp on
combination meter turns ON to indicate system malfunction. B
G When EPS warning lamp is ON, enters a manual steering state. (Control turning force steering wheel
becomes heavy.)
How to Perform Trouble Diagnosis UGS00090
C
BASIC CONCEPT
G To perform trouble diagnosis, it is the must to have understanding about vehicle systems (control and
mechanism) thoroughly. D
G It is also important to clarify customer complaints before starting
the inspection.
First of all, reproduce the symptoms, and understand them fully. E
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptoms by driving vehicle with
customer.
F
CAUTION:
Customers are not professionals. It is dangerous to make
an easy guess like "maybe the customer means that..." or
"maybe the customer mentions this symptom". STC
SEF233G

G It is essential to check symptoms right from the beginning in H
order to repair malfunctions completely.
For intermittent malfunctions, reproduce symptoms based on
interview with customer and past examples. Do not perform
I
inspection on ad hoc basis. Most intermittent malfunctions are
caused by poor contacts. In this case, it will be effective to shake
suspected harness or connector by hand. When repairing with-
out any symptom diagnosis, you cannot judge if malfunctions J
has actually been eliminated.

SEF234G K
PRECAUTIONS FOR TROUBLE DIAGNOSIS
G Be sure to check the procedures of the trouble diagnosis in advance. Refer to STC-7, "How to Perform
L
Trouble Diagnosis" .
G Always erase memory after completing trouble diagnosis.
G Checking continuity and voltage between units, be sure to check connector terminals for disconnection,
M
looseness, bend, or collapse. Repair or replace applicable part if any non-standard condition is detected.
G Be careful not to forcibly extend any connector terminal if a circuit tester is used for the check.
G Always confirm the general precautions. Refer to GI-4, "General Precautions" .
INTERVIEW
G Complaints vary depending on the person. It is important to clar-
ify the customer's actual remarks.
G Ask the customer about what symptoms occur under what con-
ditions. Use the information to reproduce the symptom of con-
firm by vehicle.

SEF907L

Revision: December 2006 STC-7 2007 Sentra
TROUBLE DIAGNOSIS
[EPS]
Component Parts Location UGS0007U

SGIA1707E

Revision: December 2006 STC-8 2007 Sentra
TROUBLE DIAGNOSIS
[EPS]
Wiring Diagram -- EPS -- UGS0007W

STC

BGWA0005E

Revision: December 2006 STC-9 2007 Sentra
TROUBLE DIAGNOSIS
[EPS]

BGWA0010E

Revision: December 2006 STC-10 2007 Sentra
TROUBLE DIAGNOSIS
[EPS]
EPS Control Unit Input/Output Signal Reference Values UGS0007X

SPECIFICATIONS WITH CONSULT-III A
CAUTION:
The output signal indicates the EPS control unit calculation date. The normal values will be displayed
even in the event that the output circuit (harness) is open. B
Monitor item (Unit) Content Condition Display value
Power supply voltage for
BATTERY VOLT (V) Ignition switch: ON Battery voltage C
EPS control unit
Steering wheel: Not
steering (There is no 0.00 Nm
steering force) D
TORQUE SENSOR (Nm) Steering wheel turning force Engine running
*1
Steering wheel: Steer- 0

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