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STEERING
A
SECTION
STEERING CONTROL SYSTEM
STC B
C
D
E
CONTENTS
BASIC INSPECTION ................................... 3
. C1609 VEHICLE SPEED SIGNAL .................... 15 F
Description ..............................................................15
.
DIAGNOSIS AND REPAIR WORKFLOW ......... 3
. DTC Logic ...............................................................15
.
Work Flow ................................................................ 3
. Diagnosis Procedure ..............................................15 . STC
SYSTEM DESCRIPTION ............................. 5
. C1610 ENGINE STATUS SIGNAL ................... 16
Description ..............................................................16
.
EPS SYSTEM ..................................................... 5
. DTC Logic ...............................................................16
. H
System Diagram ....................................................... 5
. Diagnosis Procedure ..............................................16 .
System Description .................................................. 5
.
Component Parts Location ....................................... 6
. U1000 CAN COMM CIRCUIT ........................... 17 I
Component Description ............................................ 6
. Description ..............................................................17
.
DTC Logic ...............................................................17
.
DIAGNOSIS SYSTEM (EPS CONTROL UNIT) Diagnosis Procedure ..............................................17 .
..... 7 J
Special Repair Requirement ...................................17 .
CONSULT-III Function ............................................. 7
.
EPS WARNING LAMP ...................................... 18
DTC/CIRCUIT DIAGNOSIS ......................... 8
. Description ..............................................................18
. K
Component Function Check ...................................18 .
C1601 BATTERY POWER SUPPLY ................. 8
. Diagnosis Procedure ..............................................18 .
Description ............................................................... 8
.
DTC Logic ................................................................ 8
. ECU DIAGNOSIS INFORMATION ............. 19
. L
Diagnosis Procedure ................................................ 8
.
Special Repair Requirement .................................... 9 . EPS CONTROL UNIT ....................................... 19
Reference Value .....................................................19. M
C1604 TORQUE SENSOR ................................10
. Wiring Diagram - ELECTRONICALLY CON-
Description ............................................................. 10
. TROLLED POWER STEERING SYSTEM - ...........21 .
DTC Logic .............................................................. 10
. Fail-Safe .................................................................23
.
Diagnosis Procedure .............................................. 10. N
DTC Inspection Priority Chart .................................24 .
Special Repair Requirement .................................. 11 . DTC Index ..............................................................24
.
C1606 EPS MOTOR ..........................................12
. SYMPTOM DIAGNOSIS ............................. 25
. O
Description ............................................................. 12
.
DTC Logic .............................................................. 12
. EPS WARNING LAMP DOES NOT TURN ON... 25
Diagnosis Procedure .............................................. 12. Description ..............................................................25
.
Component Inspection ........................................... 12 . P
Diagnosis Procedure ..............................................25 .
Special Repair Requirement .................................. 13 .
EPS WARNING LAMP DOES NOT TURN
C1607, C1608 EPS CONTROL UNIT ...............14
. OFF .................................................................... 26
Description ............................................................. 14
. Description ..............................................................26
.
DTC Logic .............................................................. 14
. Diagnosis Procedure ..............................................26 .
Diagnosis Procedure .............................................. 14.
Revision: 2009 March STC-1 2009 Z12
STEERING WHEEL TURNING FORCE IS PRECAUTION ............................................ 30
HEAVY OR LIGHT ............................................ 27
.
Description ............................................................. 27
. PRECAUTIONS ................................................ 30
.
Diagnosis Procedure ............................................. 27 . Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
UNBALANCE STEERING WHEEL TURNING SIONER" ................................................................ 30
.
FORCE AND RETURN BETWEEN RIGHT Precaution Necessary for Steering Wheel Rota-
AND LEFT ......................................................... 28
. tion after Battery Disconnect .................................. 30 .
Description ............................................................. 28
. Service Notice or Precautions for EPS System ..... 31 .
Diagnosis Procedure ............................................. 28 .
REMOVAL AND INSTALLATION .............. 32
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) ...................... 29
. EPS CONTROL UNIT ....................................... 32
.
Exploded View ....................................................... 32
.
Description ............................................................. 29
.
Removal and Installation ........................................ 32
.
Diagnosis Procedure ............................................. 29 .
Revision: 2009 March STC-2 2009 Z12
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION A
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000005086617
B
1.OBTAIN INFORMATION ABOUT SYMPTOM
Interview the customer to obtain as much information as possible about the conditions and environment under C
which the malfunction occurs.
>> GO TO 2. D
2.CHECK DTC
1. Check for DTC. E
2. If a DTC exists, perform the following operations.
- Records the DTCs.
- Erase DTCs
- Check that the root cause clarified with DTC matches to the malfunction information described by the cus- F
tomer.
3. Check also the related service information or others.
Do malfunction information or DTC exist? STC
Malfunction information and DTC exist. >>GO TO 3.
Malfunction information exists but no DTC. >>GO TO 4.
No malfunction information, but DTC exists. >>GO TO 5. H
3.REPRODUCE THE MALFUNCTION INFORMATION
Check the malfunction described by the customer on the vehicle.
Record the status of each signal when a symptom occurs with "Data Monitor" in CONSULT-III. I
Inspect the relation of the information and the condition when it occurs.
>> GO TO 5. J
4.CHECK THE MALFUNCTION
Check the malfunction described by the customer on the vehicle. K
Record the status of each signal when a symptom occurs with "Data Monitor" in CONSULT-III.
Inspect the relation of the information and the condition when it occurs.
L
>> GO TO 6.
5.PERFORM "DTC CONFIRMATION PROCEDURE"
M
Perform the "DTC conformation procedure" to the detected DTC and check that the DTC is detected again.
Refer to STC-24, "DTC Inspection Priority Chart" when multiple DTCs are detected, and then judge the order
for performing the diagnosis.
Is any DTC detected? N
YES >> GO TO 7.
NO >> Follow GI-6, "How to Follow Test Groups in Trouble Diagnosis" to check.
6.IDENTIFY MALFUNCTIONING SYSTEM WITH "SYMPTOM DIAGNOSIS" O
Use the "Symptom diagnosis" from the symptom inspection result in step 4. Then identify where to start per-
forming the diagnosis based on the possible causes and the symptoms. P
>> GO TO 7.
7.IDENTIFY MALFUNCTIONING PARTS WITH "COMPONENT DIAGNOSIS"
Perform the inspection with the "component diagnosis" of the applicable system.
NOTE:
The "component diagnosis" mainly consists of the check for an open circuit.
Revision: 2009 March STC-3 2009 Z12
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
The circuit check in the diagnosis procedure also requires the check for a short circuit. Refer to GI-37, "Circuit
Inspection" for details.
>> GO TO 8.
8.REPAIR OR REPLACE THE MALFUNCTIONING PARTS
1. Repair or replace the part detected as malfunctioning.
2. After repairing or replacing, reinstall/reconnect parts or connectors removed/disconnected in the "compo-
nent diagnosis", and then erase the DTC.
>> GO TO 9.
9.FINAL CHECK
Perform the "DTC confirmation procedure" or "component Inspection" to check that the repair is correctly per-
formed. Check that malfunctions are not reproduced when obtaining the malfunction information from the cus-
tomer, referring to the symptom inspection result in step 3 or 4.
Is the check result normal?
YES >> Trouble diagnosis is completed.
NO-1 >> The DTC is reproduced. GO TO 7.
NO-2 >> The symptom is reproduced. GO TO 6.
Revision: 2009 March STC-4 2009 Z12
EPS SYSTEM
< SYSTEM DESCRIPTION >
SYSTEM DESCRIPTION A
EPS SYSTEM
System Diagram INFOID:0000000005038011
B
C
D
E
F
STC
H
I
JSGIA0628GB
J
System Description INFOID:0000000005038012
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