STC.PDF

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STEERING CONTROL SYSTEM
G STEERING
SECTION STC B
STEERING CONTROL SYSTEM
C
D
E
CONTENTS
EPS
F
For Fast and Accurate Trouble Diagnosis ............. 13
Basic Inspection .................................................... 13
BASIC INSPECTION 1: POWER SUPPLY CIR-
CUIT TERMINAL LOOSENESS AND BATTERY... 13
BASIC INSPECTION 2: EPS WARNING LAMP
INSPECTION ..................................................... 13
BASIC INSPECTION 3: EPS CONTROL UNIT
POWER SUPPLY CIRCUIT AND GROUND CIR-
CUIT INSPECTION ............................................ 14
Inspection 1: Battery Voltage Malfunction ............. 15
Inspection 2: Torque Sensor Malfunction .............. 16
Inspection 3: Motor Malfunction ............................. 17
Inspection 4: EEPROM Malfunction ...................... 18
Inspection 5: Control unit malfunction ................... 18
Inspection 6: Vehicle Speed Signal Malfunction .... 19
Inspection 7: Engine Signal Malfunction ................ 19
Inspection 8: CAN Communication Circuit ............ 20
Symptom 1: Steering is Heavy or Light ................. 20
Symptom 2: There is a Difference in the Steering
Turning/Returning Force of Left and Right (Biased
to One Side) .......................................................... 21
Symptom 3: Steering Wheel Turning Force is
Uneven (Torque Variation) ..................................... 21
Symptom 4: EPS Warning Lamp Stays ON ........... 22
PRECAUTIONS ......................................................... 2
Maintenance Information ......................................... 2
RHD MODELS ..................................................... 2
LHD MODELS ...................................................... 2
SYSTEM DESCRIPTION ........................................... 3
Components ............................................................ 3
Electric Power Steering Function ............................ 3
Fail-Safe Function ................................................... 3
TROUBLE DIAGNOSIS ............................................. 4
How to Perform Trouble Diagnosis ......................... 4
BASIC CONCEPT ................................................ 4
Component Parts Location ...................................... 5
Schematic ............................................................... 6
Wiring Diagram — EPS — ...................................... 7
Control Unit Input/Output Signal Standard ............ 10
CIRCUIT TESTER REFERENCE VALUE .......... 10
STANDARD BY CONSULT-II ............................. 10
CONSULT-II Function (EPS) ..................................11
CONSULT-II MAIN FUNCTION ...........................11
CONSULT-II START PROCEDURE ....................11
SELF-DIAGNOSIS ..............................................11
DATA MONITOR ................................................ 12
ECU PART NUMBER ......................................... 13
CAN COMMUNICATION .................................... 13
STC
H
I
J
K
L
M
STC-1
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PRECAUTIONS
[EPS]
PRECAUTIONS
[EPS]
PFP:00001
Maintenance Information
BGS0004A
If any of following part is replaced, always replace with new* one.
If it's not (or fail to do so), the electrical system may not be operated properly.
*: New one means a virgin control unit that has never been energized on-board.
RHD MODELS
l BCM (Models without Intelligent Key system)
l Intelligent Key unit (Models with Intelligent Key system)
l ECM
l IPDM E/R
l Combination meter
l EPS control unit
LHD MODELS
l
BCM (Models without Intelligent Key system)
Intelligent Key unit (Models with Intelligent Key system)
l
ECM
l
STC-2
821896514.002.png
 
SYSTEM DESCRIPTION
[EPS]
SYSTEM DESCRIPTION
PFP:00000
A
Components
BGS0002W
B
C
D
E
F
STC
SGIA1304E
1.
Steering wheel
2.
Motor
3.
EPS control unit
4.
Steering gear assembly
5.
Torque sensor
6.
Reduction gear
H
A.
Sensor processing signal
B.
Sensor signal
C.
Assist torque signal (motor drive)
D.
Ignition power
E.
CAN (H)
F.
CAN (L)
G.
Power supply
H.
Ground
I
Electric Power Steering Function
BGS0002X
Parts name
Function
J
Outputs optimum assist torque signal to motor by steering wheel turning force
(sensor signal) from torque sensor and vehicle speed signal from CAN communi-
cation.
l
K
Reduces output signals to motor and protects motor and EPS control unit when
using power steering continuously and excessively.
l
Electric power steering (EPS) control unit
Under unusual conditions of electric system, fail-safe function starts, output sig-
nal to motor is turned off, and then changes to manual steering. EPS warning
lamp turns on to indicate system error.
l
L
Controls communication with other control units by using CAN communication.
l
M
Allows system diagnosis with CONSULT-II
l
Motor
Produces assist torque by control signal from EPS control unit.
l
Detects steering wheel turning force and outputs sensor signal to EPS control
unit.
l
Torque sensor
Increases motor-produced assist torque by worm gear and transmits it to column
shaft.
l
Reduction gear
Turns on when fail-safe function operates, and indicates manual steering state.
l
EPS warning lamp
Turns on when key switch is turned on to check value, and turns off after engine
starts
l
Fail-Safe Function BGS0002Y
In case an unusual condition is encountered in the system, fail-safe function stops EPS control and the system
enters a fail-safe state. EPS warning lamp turns on to indicate unusual state, and enters a manual steering
state. (Control turning force of steering wheel becomes heavy.)
STC-3
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TROUBLE DIAGNOSIS
[EPS]
TROUBLE DIAGNOSIS
PFP:00004
How to Perform Trouble Diagnosis
BGS0002Z
BASIC CONCEPT
l
The most important point to perform trouble diagnosis is to understand systems (control and mechanism)
in vehicle thoroughly.
It is also important to clarify customer complaints before inspec-
tion.
First of all, reproduce symptom, and understand it fully.
Ask customer about his/her complaints carefully. In some cases,
it will be necessary to check symptom by driving vehicle with
customer.
CAUTION:
Customers are not professionals. Do not assume “maybe
customer means...” or “maybe customer mentioned this
symptom”.
l
SEF234G
It is essential to check symptoms right from beginning in order to
repair a malfunction completely.
For an intermittent malfunction, it is important to reproduce
symptom based on interview with customer and past examples.
Do not perform 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 repairs are performed without any symptom check, no
one can judge if malfunction has actually been eliminated.
l
After diagnosis, make sure to perform “ERASE MEMORY”.
Refer to STC-11, "Erase Memory" .
l
SEF233G
Always read “GI General Information” to confirm general precau-
tions. Refer to GI-4, "General Precautions" .
l
STC-4
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TROUBLE DIAGNOSIS
[EPS]
Component Parts Location
BGS00030
A
B
C
D
E
F
STC
H
I
J
K
L
M
MGIB0003E
1.
Motor
2.
EPS control unit
3.
Torque sensor (built-in)
4.
Reduction gear (built-in)
5.
EPS warning lamp
A.
Sensor processing signal
B.
Sensor signal
C.
Assist torque signal (motor drive)
D.
Ignition power
E.
CAN (H)
F.
CAN (L)
G.
Power supply
H.
Ground
STC-5
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