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Page 63 of 2100

ISUZU AXIOM 2002 Service Repair Manual HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±37
8. When finished with the refrigerant charging, close the
low pressure valve of the manifold gauge and
container valve.
9. Check for refrigerant

Page 86 of 2100

ISUZU AXIOM 2002 Service Repair Manual 1A±60
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Checking and Adjusting for
Compressor Replacement
150 cc (5.0 fl.oz.) of oil is charged in compressor (service
parts). So it is necessary to dra

1A±60
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Checking and Adjusting for
Compressor Replacement
150 cc (5.0 fl.oz.) of oil is charged in compressor (service
parts). So it is necessary to drain the proper amount of oil
from the new compressor.
1. Perform oil return operation.
2. Discharge and recover the refrigerant and remove the
compressor.
3. Drain the compressor oil and measure the extracted
oil.
4. Check the compressor oil for contamination.
5. Adjust the oil level as required.
(Amount of oil drained
from used compressor)
(Draining amount of oil
from new compressor)
less than 90 cc (3.0 fl.oz)Same as drained
amount
more than 90 cc (3.0
fl.oz)90 cc (3.0 fl.oz)
6. Evacuate, charge and perform the oil return
operation.
7. Check the system operation.
Contamination of Compressor Oil
Unlike engine oil, no cleaning agent is added to the
compressor oil. Even if the compressor runs for a long
period of time (approximately one season), the oil never
becomes contaminated as long as there is nothing wrong
with the compressor or its method of use.
Inspect the extracted oil for any of the following
conditions:
The capacity of the oil has increased.
The oil has changed to red.
Foreign substances, metal powder, etc., are present
in the oil.
If any of these conditions exists, the compressor oil
is contaminated. Whenever contaminated
compressor oil is discovered, the receiver/drier must
be replaced.
Oil Return Operation
There is close affinity between the oil and the refrigerant.
During normal operation, part of the oil recirculates with
the refrigerant in the system. When checking the amount
of oil in the system, or replacing any component of the
system, the compressor must be run in advance for oil
return operation. The procedure is as follows:
1. Open all the doors and the engine hood.
2. Start the engine and air conditioning switch to ªONº
and set the fan control knob at its highest position.
3. Run the compressor for more than 20 minutes
between 800 and 1,000 rpm in order to operate the
system.
4. Stop the engine.
Replacement of Component Parts
When replacing the system component parts, supply the
following amount of oil to the component parts to be
installed.
(Component parts to be
installed)
(Amount of Oil)
Evaporator 50 cc (1.7 fl. oz.)
Condenser30 cc (1.0 fl. oz.)
Receiver/dryer30 cc (1.0 fl. oz.)
Refrigerant line (one
piece)10 cc (0.3 fl. oz.)

Page 115 of 2100

ISUZU AXIOM 2002 Service Repair Manual HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±89
Performance and Movement
checklist for Automatic Air
Conditioner Related Parts
Start the engine, and when the engine coolant reached
50C (122F

Page 118 of 2100

ISUZU AXIOM 2002 Service Repair Manual 1A±92
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
StepActionValue(s)Ye sNo
11. Allow the engine to idle until it completely warms up.
2. Turn the starter switch to the OFF position.
3. Place a 6

Page 145 of 2100

ISUZU AXIOM 2002 Service Repair Manual HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±119
Power Transistor
1. Remove the power transistor connector (C±34) from
the evaporator assembly.
2. Check the conduction between the power tra

Page 161 of 2100

ISUZU AXIOM 2002 Service Repair Manual 2A±10
POWER±ASSISTED STEERING SYSTEM
The steering column has three important features in
addition to the steering function:
1. The column is energy absorbing, designed to
compress in a front-end col

2A±10
POWER±ASSISTED STEERING SYSTEM
The steering column has three important features in
addition to the steering function:
1. The column is energy absorbing, designed to
compress in a front-end collision to minimize the
possibility of injury to the driver of the vehicle.
2. The ignition switch and lock are mounted
conveniently on the column.
3. With the column mounted lock, the ignition and
steering operation can be locked to prevent theft of
the vehicle.The column can be disassembled and reassembled.
However, to insure the energy absorbing action, use only
the specified screws, bolts and nuts as designated, and
tighten them to the specified torque.
Handle the column with care when it is removed from the
vehicle. A sharp blow on the end of steering shaft or shift
lever, or dropping the assembly could shear or loosen the
fasteners that maintain column rigidity.
Power Steering System Test
Test Procedure
C02RW001
Legend
(1) Fluid Reservoir(2) Power Steering Unit
(3) Power Steering Pump
Test of fluid pressure in the power steering system is
performed to determine whether or not the oil pump and
power steering unit are functioning normally.
The power steering system test is used to identify and
isolate hydraulic circuit difficulties. Prior to performing
this test, the following inspections and corrections, if
necessary, must be made.
Inspect pump reservoir for proper fluid level.
Inspect pump belt for proper tension.
Inspect pump driver pulley condition. 1. Place a container under the pump to catch the fluid
when disconnecting or connecting the hoses.
2. With the engine NOT running, disconnect the
pressure hose at the power steering pump and install
power steering tester J-29877-A. The gage must be
between the shutoff valve and pump. Open the
shutoff valve.
3. Check the fluid level. Fill the reservoir with power
steering fluid, to the ªFullº mark. Start the engine,
then turn the steering wheel and momentarily hold it
against a stop (right or left). Turn the engine off and
check the connections at tester for leakage.

Page 162 of 2100

ISUZU AXIOM 2002 Service Repair Manual POWER±ASSISTED STEERING SYSTEM2A±11
4. Bleed the system. Refer to Bleeding the Power
Steering System
in this section.
5. Start the engine and check the fluid level. Add power
steering fluid if req

POWER±ASSISTED STEERING SYSTEM2A±11
4. Bleed the system. Refer to Bleeding the Power
Steering System
in this section.
5. Start the engine and check the fluid level. Add power
steering fluid if required. When the engine is at
normal operating temperature, increase engine
speed to 1500 rpm.
CAUTION: Do not leave shutoff valve fully closed
for more than 5 seconds, as the pump could become
damaged internally.
6. Fully close the shutoff valve. Record the highest
pressures.
If the pressure recorded is within 9300±9800 kPa
(1350±1420 psi), the pump is functioning within its
specifications.
If the pressure recorded is higher than 9800 kPa
(1420 psi), the valve in the pump is defective.
If the pressure recorded is lower than 9300 kPa
(1350 psi), the valve or the rotating group in the
pump is defective.
7. If the pump pressures are within specifications, leave
the valve open and turn (or have someone else turn)
the steering wheel fully in both directions. Record the
highest pressures and compare with the maximum
pump pressure recorded in step 6. If this pressure
cannot be built in either side of the power steering
unit, the power steering unit is leaking internally and
must be replaced.
8. Shut the engine off, remove the testing gauge.
9. Reconnect the pressure hose, check the fluid level
and make the needed repairs.
10. If the problem still exists, the steering and front
suspension must be thoroughly examined.
Maintenance
The hydraulic system should be kept clean and fluid level
in the reservoir should be checked at regular intervals and
fluid added when required. Refer to
Recommended
Fluids and Lubricants in General Information
section for
the type of fluid to be used and the intervals for filling.
If the system contains some dirt, flush it as described in
this section. If it is exceptionally dirty, the pump must be
completely disassembled before further usage. (The
steering unit cannot be disassembled.)
All tubes, hoses, and fittings should be inspected for
leakage at regular intervals. Fittings must be tight. Make
sure the clips, clamps and supporting tubes and hoses
are in place and properly secured.
Power steering hoses and lines must not be twisted,
kinked or tightly bent. Air in the system will cause spongy
action and noisy operation. When a hose is disconnected
or when fluid is lost, for any reason, the system must be
bled after refilling. Refer to
Bleeding the Power Steering
System
in this section.
Inspect belt for tightness.
Inspect pulley for looseness or damage. The pulley
should not wobble with the engine running.
Inspect hoses so they are not touching any other
parts of the vehicle.
Inspect fluid level and fill to the proper level.
Fluid Level
1. Run the engine until the power steering fluid reaches
normal operating temperature, about 55C (130F),
then shut the engine off.
2. Check the level of fluid in the reservoir.
3. If the fluid level is low, add power steering fluid as
specified in General Information to the proper level
and install the receiver cap.
4. When checking the fluid level after the steering
system has been serviced, air must be bled from the
system. Refer to
Bleeding the Power Steering
System
in this section.
Bleeding The Power Steering System
When a power steering pump or unit has been installed,
or an oil line has been disconnected, the air that has
entered the system must be bled out before the vehicle is
operated. If air is allowed to remain in the power steering
fluid system, noisy and unsatisfactory operation of the
system may result.
Bleeding Procedure
When bleeding the system, and any time fluid is added to
the power steering system, be sure to use only power
steering fluid as specified in General Information.
1. Fill the pump fluid reservoir to the proper level and let
the fluid settle for at least two minutes.
2. Start the engine and let it run for a few seconds. Do
not turn the steering wheel. Then turn the engine off.
3. Add fluid if necessary.
4. Repeat the above procedure until the fluid level
remains constant after running the engine.
5. Raise and support the front end of the vehicle so that
the wheels are off the ground.
6. Start the engine. Slowly turn the steering wheel right
and left, lightly contacting the wheel stops.
7. Add power steering fluid if necessary.
8. Lower the vehicle, set the steering wheel at the
straight forward position after turning it to its full steer
positions 2 or 3 times, and stop the engine.
9. Check the fluid level and refill as required.
10. If the fluid is extremely foamy, allow the vehicle to set
a few minutes, then repeat the above procedure.
Flushing The Power Steering System
1. Raise and support the front end of the vehicle off the
ground until the wheels are free to turn.
2. Remove the fluid return line at the pump inlet
connector and plug the connector port on the pump.
Position the line toward a large container to catch the
draining fluid.
3. While running the engine at idle, fill the reservoir with
new power steering fluid. Turn the steering wheel in
both directions. Do not contact or hold the steering
wheel to the wheel stops. This will cause the pump to
go to pressure relief mode, which may cause a
sudden fluid overflow at the reservoir.

Page 163 of 2100

ISUZU AXIOM 2002 Service Repair Manual 2A±12
POWER±ASSISTED STEERING SYSTEM
4. Install all the lines and hoses. Fill the system with new
power steering fluid and bleed the system as
described in Bleeding The Power Steering System.
Opera

2A±12
POWER±ASSISTED STEERING SYSTEM
4. Install all the lines and hoses. Fill the system with new
power steering fluid and bleed the system as
described in Bleeding The Power Steering System.
Operate the engine for about 15 minutes.
Remove the pump return line at the pump inlet and
plug the connection on the pump. While refilling the
reservoir, check the draining fluid for contamination.
If foreign material is still evident, replace all lines,
disassemble and clean or replace the power steering
system components. Do not re-use any drained
power steering fluid.
Steering Wheel Free Play Inspection
430R200001
1. With the tires in the straight-ahead position, check the
amount of steering wheel play by turning the wheel in
both directions until the tires begin to move.
NOTE: The wheel free play should be checked with the
engine running.
Free play: 0 ± 30 mm (0 ± 1.18 in)
2. Also check the steering wheel for play and looseness
in the mount by moving it back and forth and
sideways. When test driving, check for hard steering,
steering shimmy and tendency to pull to one side.
Front End Alignment Inspection and
Adjustment
General Description
ªFront End Alignmentº refers to the angular relationship
between the front wheels, the front suspension attaching
parts and the ground.
Proper front end alignment must be maintained in order to
insure efficient steering, good directional stability and to
prevent abnormal tire wear.
The most important factors of front end alignment are
wheel toe-in, wheel camber and axle caster.Camber:
This illustration shows view from the front of the vehicle.
480RS004Camber is the vertical tilting inward or outward of the front
wheels. When the wheels tilt outward at the top, the
camber is positive (+). When the wheels tilt inward at the
top, the camber is negative (-). The amount of tilt
measured in degrees from the vertical is called the
camber angle (1). If camber is extreme or unequal
between the wheels, improper steering and excessive tire
wear will result. Negative camber causes wear on the
inside of the tire, while positive camber causes wear to the
outside.
Caster:
This illustration shows view from the side of the vehicle.
480RS005

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