Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 568

POWER ASSISTED SYSTEM

2A–1

TROOPER

STEERING

POWER ASSISTED SYSTEM

CONTENTS

Service Precaution

2A–2

. . . . . . . . . . . . . . . . . . . . . . 

General Description

2A–2

. . . . . . . . . . . . . . . . . . . . . 

Diagnosis

2A–5

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Power Steering System Test

2A–11

. . . . . . . . . . . . . . 

Maintenance

2A–12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Fluid Level

2A–12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Bleeding The Power Steering System

2A–12

. . . . . . 

Bleeding Procedure

2A–12

. . . . . . . . . . . . . . . . . . . . . 

Flushing The Power Steering System

2A–12

. . . . . . 

Steering Wheel Free Play Adjustment

2A–13

. . . . . . 

Front End Alignment Inspection and
 Adjustment

2A–13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Main Data and Specifications

2A–18

. . . . . . . . . . . . . 

Special Tools

2A–19

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

Power Steering Gear

2A–20

. . . . . . . . . . . . . . . . . . . . 

Power Steering Gear and Associated
 Parts

2A–20

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Removal

2A–20

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–21

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Steering Gear Disassembled View

2A–22

. . . . . . . 

Disassembly

2A–23

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection and Repair

2A–24

. . . . . . . . . . . . . . . . . . 

Reassembly

2A–25

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Main Data and Specifications

2A–27

. . . . . . . . . . . 

Power Steering Pump

2A–28

. . . . . . . . . . . . . . . . . . . . 

Power Steering Pump and Associated
 Parts

2A–28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Removal

2A–28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–29

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Power Steering Pump Disassembled View

2A–30

Disassembly

2A–30

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection and Repair

2A–31

. . . . . . . . . . . . . . . . . . 

Reassembly

2A–32

. . . . . . . . . . . . . . . . . . . . . . . . . . 

1Main Data and Specifications

2A–33

. . . . . . . . . . 

Center Track Rod Assembly

2A–34

. . . . . . . . . . . . . . 

Center Track Rod Assembly and
 Associated Parts

2A–34

. . . . . . . . . . . . . . . . . . . . . . 

Removal

2A–35

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection and Repair

2A–35

. . . . . . . . . . . . . . . . . . 

Installation

2A–35

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Outer Track Rod Assembly

2A–36

. . . . . . . . . . . . . . . 

Outer Track Rod Assembly and Associated
 Parts

2A–36

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Removal

2A–37

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection and Repair

2A–37

. . . . . . . . . . . . . . . . . . 

Installation

2A–38

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Relay Lever

2A–39

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Relay Lever and Associated Parts

2A–39

. . . . . . . 

Removal

2A–39

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–40

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Steering Linkage and Associated Parts

2A–41

. . . . 

Main Data and Specifications

2A–41

. . . . . . . . . . . 

Special Tools

2A–42

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Supplemental Restraint System Steering
 Wheel & Column

2A–43

. . . . . . . . . . . . . . . . . . . . . . . 

Service Precaution

2A–43

. . . . . . . . . . . . . . . . . . . . 

SRS Connectors

2A–43

. . . . . . . . . . . . . . . . . . . . . . 

Inflator Module

2A–45

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Inflator Module and Associated Parts

2A–45

. . . . . 

Removal

2A–45

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection and Repair

2A–46

. . . . . . . . . . . . . . . . . . 

Installation

2A–46

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Steering Wheel

2A–47

. . . . . . . . . . . . . . . . . . . . . . . . . 

Steering Wheel and Associated Parts

2A–47

. . . . 

Removal

2A–47

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–49

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Combination Switch

2A–50

. . . . . . . . . . . . . . . . . . . . . 

Combination Switch and Associated Parts

2A–50

Removal

2A–50

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–52

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Lock Cylinder

2A–54

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

Lock Cylinder and Associated Parts

2A–54

. . . . . . 

Removal

2A–54

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–56

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

System Inspection

2A–57

. . . . . . . . . . . . . . . . . . . . . 

Steering Column

2A–58

. . . . . . . . . . . . . . . . . . . . . . . . 

Steering Column and Associated Parts

2A–58

. . . 

Removal

2A–58

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Inspection

2A–60

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation

2A–62

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

System Inspection

2A–63

. . . . . . . . . . . . . . . . . . . . . 

Supplemental Restraint System Steering
 Wheel & Column and Associated Parts

2A–64

. . . . 

Main Data and Specifications

2A–64

. . . . . . . . . . . 

Special Tools

2A–65

. . . . . . . . . . . . . . . . . . . . . . . . . . 

SECTION

2A–2

POWER ASSISTED SYSTEM

Service Precaution

WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS).  REFER TO THE SRS
COMPONENT AND WIRING LOCATION VIEW IN
ORDER TO DETERMINE WHETHER YOU ARE
PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING.  WHEN YOU
ARE PERFORMING SERVICE ON OR NEAR THE SRS
COMPONENTS OR THE SRS WIRING, REFER TO
THE SRS SERVICE INFORMATION.  FAILURE TO
FOLLOW WARNINGS COULD RESULT IN POSSIBLE
AIR BAG DEPLOYMENT, PERSONAL INJURY, OR
OTHERWISE UNNEEDED SRS SYSTEM REPAIRS.

CAUTION: Always use the correct fastener in the
proper location.  When you replace a fastener, use
ONLY the exact part number for that application.
ISUZU will call out those fasteners that require a
replacement after removal.  ISUZU will also call out
the fasteners that require thread lockers or thread
sealant.  UNLESS OTHERWISE SPECIFIED, do not
use supplemental coatings (Paints, greases, or other
corrosion inhibitors) on threaded fasteners or
fastener joint interfaces.  Generally, such coatings
adversely affect the fastener torque and the joint
clamping force, and may damage the fastener.  When
you install fasteners, use the correct tightening
sequence and specifications.  Following these
instructions can help you avoid damage to parts and
systems.  

General Description

The hydraulic power steering system consists of a pump,
an oil reservoir, a steering gear, a pressure hose and a
return hose.

Power Steering Gear

A03RS001

The power steering gear has a recirculating ball system
which acts as a rolling thread between the worm shaft and
the rack piston.  When the worm shaft is turned right, the
rack piston moves up in gear.
Turning the worm shaft left moves the rack piston down in
gear.  The rack piston teeth mesh with the sector gear,
which is part of the sector shaft.
Turning the worm shaft turns the sector shaft, which turns
the wheels through the steering linkage.

The control valve in the steering gear directs the power
steering fluid to either side of the rack piston.
The rack piston converts the hydraulic pressure into a
mechanical force.  If the steering system becomes
damaged and loses hydraulic pressure, the vehicle can
be controlled manually.

POWER ASSISTED SYSTEM

2A–3

Hydraulic Pump

442RV006

The hydraulic pump is a vane-type design.  There are two
openings at the rear of the pump housing.  The larger
opening contains the cam ring, pressure plate, thrust
plate, rotor and vane assembly, and end plate.  The
smaller opening contains the pressure line union, flow
control valve and spring.

Pressure Switch

When hydraulic pressure reaches 3650 

±

 350 kPa (530 

±

50 psi), the pressure switch of the power steering pump
closes causing the Powertrain Control Module (PCM) to
actuate the throttle valve, which increases the engine rpm
to prevent the overload-induced engine speed slow
down. The switch opens when hydraulic pressure drops
to 3150 

±

 350 kPa (460 

±

 50 psi).

2A–4

POWER ASSISTED SYSTEM

Steering Linkage

433RS007

Legend

(1) Center Track Rod Assembly
(2) Outer Track Rod Assembly
(3) Pitman Arm

(4) Relay Lever
(5) Rod End,Outer
(6) Track Rod
(7) Rod End,Inner

The steering linkage consists of a pitman arm, relay lever,
center track rod, and two adjustable outer track rods.
When the steering wheel is turned, the gear rotates the
pitman arm which forces the center track rod to one side.
The outer track rods, connected to the center track rod by
ball studs, transfers the steering force to the wheels.  The
outer track rods are adjustable and are used for toe-in
adjustments.  The center track rod is supported by the
pitman arm and relay lever.  The relay lever pivots on a
support attached to the frame.
The overall condition of the steering linkage affects
steering performance.  If parts are bent, damaged, worn
or poorly lubricated, improper and possibly dangerous
steering action will result.
Whenever any steering linkage components are repaired
or replaced, check the steering geometry and front end
alignment.  Refer to Front End Alignment Inspection and
Adjustment in this section.