Page 4425 of 5121
HYDRAULIC LINE
ST-35
< ON-VEHICLE REPAIR >
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VQ35DE Models
Removal and InstallationINFOID:0000000003806331
CAUTION:
Never apply fluid to the hose (1) and tube (2).
Insert hose securely until it contacts spool (A) of tube.
Leave clearance (L) when installing clamp (3).
JSGIA0402GB
1. Reservoir tank bracket 2. Bushing 3. Reservoir tank
4. Suction hose 5. Clamp 6. Copper washer
7. High pressure piping 8. Steering gear assembly 9. O-ring
10. Eye bolt 11. Pressure sensor
A. To power steering oil pump suction
hose.B. To power steering oil pump.
: Vehicle front
Refer to GI-4, "
Components" for symbols not described on the above.
Standard
L : 3 – 8 mm (0.12 – 0.31 in)
JSGIA0118ZZ
Page 4426 of 5121
ST-36
< ON-VEHICLE REPAIR >
HYDRAULIC LINE
Install eye bolt with eye joint (assembled to high pressure
hose) (B) protrusion (A) facing with pump side cutout, and
then tighten it to the specified torque after tightening by hand.
Refer to ST-34, "
Exploded View".
Securely insert harness connector to pressure sensor.
Never reuse copper washer.
SGIA1379E
Page 4427 of 5121

SERVICE DATA AND SPECIFICATIONS (SDS)
ST-37
< SERVICE DATA AND SPECIFICATIONS (SDS)
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SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
General SpecificationsINFOID:0000000003806332
Steering Wheel Axial End Play and PlayINFOID:0000000003806333
Unit: mm (in)
Steering Wheel Turning ForceINFOID:0000000003806334
Unit: N·m (kg-m, in-lb)
Steering AngleINFOID:0000000003806335
Unit: Degree minute (Decimal degree)
Steering Column LengthINFOID:0000000003826226
Unit: mm (in)
Steering Column Mounting DimensionsINFOID:0000000003826227
Unit: mm (in)
Steering Column Operating RangeINFOID:0000000003806336
Steering gear modelPR26AF
Fluid capacity (Approx.)
(lmp qt)1.0 (7/8)
Item Standard
Steering wheel axial end play 0 (0)
Steering wheel play on the outer circumference 0 – 35 (0 – 1.38)
Item Standard
Steering wheel turning force 7.45 (0.76, 66)
ItemStandard
Tire size: 205/65R16 Tire size: 215/55R17
Inner wheelMinimum 38°00′ (38.0°)34°00′ (34.0°)
Nominal 41°00′ (41.0°)37°00′ (37.0°)
Maximum 42°30′ (42.5°)38°30′ (38.5°)
Outer wheel Nominal 33°00′ (31.0°)31°00′ (31.0°)
Item Standard
Column length484 – 486 (19.06 – 19.13)
Item Standard
Mounting dimension 19.5 (0.768) or less
Item Standard
Tilt operating range 37 mm (1.46 in)
Rotating torque 0.49 N·m (0.05 kg-m, 4 in-lb)
Page 4428 of 5121

ST-38
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Lower Shaft Sliding Range
INFOID:0000000003806337
Unit: mm (in)
Rack Sliding ForceINFOID:0000000003806338
Unit: N (kg, lb)
Rack StrokeINFOID:0000000003806339
Unit: mm (in)
Socket Swing Force and Rotating TorqueINFOID:0000000003806340
SWING FORCE
Unit: N (kg, lb)
ROTATING TORQUE
Unit: N·m (kg-m, in-lb)
Socket Axial End PlayINFOID:0000000003806341
Unit: mm (in)
Inner Socket LengthINFOID:0000000003806342
Unit: mm (in)
Relief Oil PressureINFOID:0000000003806343
Unit: kPa (bar, kg/cm2, psi)
Item Standard
Sliding range422.2 – 423.2 (16.62 – 16.66)
Item Standard
Rack sliding force 225.6 – 284.4 (23 – 29, 50.7 – 63.9)
ItemStandard
Tire size: 205/65R16 Tire size: 215/55R17
Rack stroke 74.5 (2.933) 69.0 (2.720)
Item Standard
Outer socket 4.81 – 45.7 (0.5 – 4.6, 1.1 – 10.2)
Inner socket 8.9 – 64 (0.91 – 6.5, 2.01 – 14.3)
Item Standard
Outer socket 0.3 – 2.9 (0.03 – 0.29, 3 – 25)
Item Standard
Outer socket0.5 (0.02) or less
Inner socket0.2 (0.008) or less
Item Standard
Rack neutral position84.3 (3.32)
Item Standard
Relief oil pressure 9,300 – 10,300 (93 – 103, 94.9 – 105.1, 1,349 – 1,494)
Page 4429 of 5121

STC-1
STEERING
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SECTION STC
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STC
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CONTENTS
STEERING CONTROL SYSTEM
BASIC INSPECTION ....... .............................2
DIAGNOSIS AND REPAIR WORK FLOW .... .....2
Work Flow ........................................................... ......2
FUNCTION DIAGNOSIS ...............................3
EPS SYSTEM ... .............................................. .....3
System Diagram .................................................. ......3
System Description ...................................................3
Component Parts Location ........................................5
Component Description .............................................5
COMPONENT DIAGNOSIS ..........................6
POWER SUPPLY AND GROUND CIRCUIT .. .....6
Description .......................................................... ......6
Diagnosis Procedure .................................................6
POWER STEERING SOLENOID VALVE ...........7
Description .......................................................... ......7
Diagnosis Procedure .................................................7
Component Inspection ..............................................8
ENGINE SPEED SIGNAL CIRCUIT ............... .....9
Description .......................................................... ......9
Diagnosis Procedure .................................................9
VEHICLE SPEED SIGNAL CIRCUIT .................11
Description .......................................................... ....11
Diagnosis Procedure ...............................................11
ECU DIAGNOSIS .........................................13
POWER STEERING CONTROL UNIT ..............13
Reference Value .................................................. ....13
Wiring Diagram - ELECTRONICALLY CON-
TROLLED POWER STEERING SYSTEM - ............
14
Fail-Safe .............................................................. ....15
SYMPTOM DIAGNOSIS ..............................17
UNBALANCE STEERING WHEEL TURNING
FORCE (TORQUE VARIATION) .......................
17
Description ........................................................... ....17
Diagnosis Procedure ...............................................17
PRECAUTION ..............................................18
PRECAUTIONS .................................................18
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
18
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect ...................................
18
ON-VEHICLE REPAIR .................................19
POWER STEERING CONTROL UNIT ..............19
Exploded View ..................................................... ....19
Removal and Installation .........................................19
Page 4430 of 5121

STC-2
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORK FLOW
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORK FLOW
Work FlowINFOID:0000000003893521
DETAILED FLOW
1.COLLECT THE INFORMATION FROM THE CUSTOMER
It is also important to clarify customer complaints before inspection. First of all, reproduce symptoms and
understand them fully. Ask customer about his/her complaints carefully. In some cases, it is necessary to
check symptoms by driving vehicle with customer.
CAUTION:
Customers are not professional. It is dangerous to make an easy guess like “maybe the customer
means that...,” or “maybe the customer mentions this symptom”.
>> GO TO 2.
2.CHECK THE STATUS
1. Check the power steering fluid leakage and power steering fluid level. Refer to ST-7, "
Inspection".
2. Check the drive belt tension. Refer to EM-12, "
Checking".
3. Check the power steering gear for damages, cracks and fluid leakage. Refer to ST-26, "
Inspection".
4. Check the relief oil pressure. Refer to ST-32, "
Inspection".
>> GO TO 3.
3.DIAGNOSIS CHART BY SYMPTOM
Perform the diagnosis by symptom. Refer to STC-17, "
Diagnosis Procedure".
>> GO TO 4.
4.FINAL CHECK
Check the input/output standard values for the power steering control unit.
Are the power steering control unit input/output values within standard ranges respectively?
YES >> INSPECTION END
NO >> GO TO 2.
Page 4431 of 5121
EPS SYSTEM
STC-3
< FUNCTION DIAGNOSIS >
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FUNCTION DIAGNOSIS
EPS SYSTEM
System DiagramINFOID:0000000003893522
CONTROL DIAGRAM
CROSS-SECTIONAL VIEW
System DescriptionINFOID:0000000003893523
• The EPS system controls the power steering solenoid valve through the power steering control unit.
JSGIA0119GB
1. Combination meter 2. Power steering control unit 3. Power steering solenoid valve
4. Steering gear assembly 5. Gear housing assembly 6. Gear sub-assembly
7. Pinion 8. Power steering oil pump 9. Reservoir tank
JSGIA0376ZZ
Page 4432 of 5121

STC-4
< FUNCTION DIAGNOSIS >
EPS SYSTEM
The valve driving voltage to control the power steering solenoid
valve varies according to the vehicle speed.
OPERATION PRINCIPLE
During Parking (When Turning The Steering Wheel To The Right.)
1. Power steering solenoid valve is closed while a vehicle is stopped.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “P” in the gear housing assembly is the sum of oil pressures occurred in “2R” and “3R”. This
results in a light steering force because of high pressure.
During High-speed Operation
1. Power steering solenoid valve is opened during high-speed operation.
2. Pinion “1R”, “2R” and “3R” are closed depending on steering torque of steering wheel.
3. Oil pressure “2R” does not occur because the power steering solenoid valve is on full throttle.
4. Oil pressure “P” in the gear housing assembly includes only oil pressure occurred in “3R” and results in a
heavy steering force.
JSGIA0374GB
JSGIA0020GB
JSGIA0021GB