2002 ISUZU AXIOM sensor

1A±28
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Condition CorrectionPossible cause
Suction (Low Gauge) Pressure
Abnormally Low
Receiver/drier inlet and outlet
refrigerant line temperature. (A
distinct difference in temperature
develops.)Receiver/Drier clogged.Replace the receiver/drier.
Suction (Low Gauge) Pressure
Abnormally Low.
Expansion valve outlet refrigerant
line. (Not cold and low pressure
gauge indicates vacuum.)Expansion valve temperature sensor
is defective.Replace the expansion valve.
Suction (Low Gauge) Pressure
Abnormally Low.
When the refrigerant line is clogged
or blocked, the low pressure gauge
reading will decrease, or a vacuum
reading may be shown.Clogged or blocked refrigerant line.Replace refrigerant line.
Suction (Low Gauge) Pressure
Abnormally Low.
Evaporator core is frozen.Thermo switch defective.Replace thermo switch.
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.Excessive refrigerant in system.Discharge and recover the
refrigerant, the Recharge to the
specified amount.
Insufficient cooling.Condenser clogged or dirty.Clean the condenser fin.
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.
Suction (Low) pressure hose (Not
cold).Air in system.Evacuate and charge refrigerant.
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
Low.
Insufficient coolingInsufficient refrigerant in system.Check for leaks. Discharge and
recover refrigerant. Recharge to
specified amount.
A/C Ð Air Conditioning

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±41
8. Remove horn (R/LH).
9. Remove front side turn signal light (R/LH).
10. Remove head light (R/LH).
11. Disconnect pressure switch, ambient sensor and
condenser fan connector.
12. Disconnect refrigerant line.

When removing the line connector, the connecting
part should immediately be plugged or capped to
prevent foreign matter from being mixed into the
line.
13. Remove condenser & receiver tank assembly.

Handle with care to prevent damaging the
condenser or radiator fin.
Installation
1. Install condenser & reciver tank assembly.

If installing a new condenser, be sure to add 30cc
(1.0 fl. oz.) of new compressor oil to a new one.

Tighten the condenser fixing bolts to the specified
torque.
Torque: 6 Nwm (52 lb in)
2. Connect refrigerant line.

Tighten the inlet line connector fixing bolt to the
specified torque.
Torque: 15 Nwm (11 lb ft)

Tighten the outlet line connector fixing bolt to the
specified torque.
Torque: 6 Nwm (52 lb in)

O-rings cannot be reused. Always replace with new
ones.

Be sure to apply new compressor oil to the O-rings
when connecting the refrigerant line.
3. Connect pressure switch, ambient sensor and
condenser fan connector.
4. Install head light (R/LH).
5. Install front side turn signal light (R/LH).
6. Install horn (R/LH).
7. Install engine hood front end with engine hood lock &
bumper stay.

Align the setting mark when installing.
8. Install condenser air guide.
9. Install front side bumper retainer (RH).
10. Install front center bumper retainer.
11. Install front bumper assembly.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±45
Evaporator Assembly
Evaporator Assembly and Associated Parts
874R200015
Legend
(1) Refrigerant Line
(2) Drain Hose
(3) Dash Side Trim Panel
(4) Power Transistor and Duct Sensor Connector(5) Passenger Lower Bracket
(6) Sill Plate
(7) Evaporator Assembly
(8) Glove Box
Removal
1. Disconnect the battery ground cable.
2. Discharge and recover refrigerant.

Refer to
Refrigerant Recovery in this section.
3. Remove glove box.
4. Disconnect power transistor (2) and duct sensor
connector (1).
5. Remove sill plate.
6. Remove dash side trim panel.
7. Remove passenger lower bracket.
8. Disconnect drain hose.
874R200005

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±47
Duct Sensor, Evaporator Core and/or Expansion Valve
Disassembled View
874R200012
Legend
(1) Lining
(2) Expansion Valve
(3) O-ring
(4) Evaporator Assembly
(5) Lower Case(6) Clip
(7) Attaching Screw
(8) Evaporator Core
(9) Duct Sensor
(10) Upper Case
Removal
1. Disconnect the battery ground cable.
2. Discharge and recover refrigerant.

Refer to
Refrigerant Recovery in this section.
3. Remove evaporator assembly.

Refer to
Evaporator Assembly in this section.
4. Remove the duct sensor fixing clip.
Pull the sensor from the evaporator assembly.
5. Remove clip.
6. Remove attaching screw.
7. Remove upper case.
8. Remove lower case.

Slit the case parting face with a knife since the lining
is separated when removing the evaporator.
874RS006

1A±48
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Lift to remove the upper case.
874R200007
9. Remove evaporator core.
874R200008
10. Remove expansion valve.

Tear off the insulator carefully.

Remove the sensor fixing clip.

Use a back-up wrench when disconnecting all
refrigerant pipes.
Installation
To install, follow the removal steps in the reverse order,
noting the following points:
1. The sensor is installed on the core with the clip.
2. The sensor must not interfere with the evaporator
core.
3. When installing the new evaporator core, install the
duct sensor (2) to the evaporator core (1) specified
position with the clip in the illustration.
874RY00016
4. O-rings cannot be reused. Always replace with new
ones.
5. Be sure to apply new compressor oil to the O-rings
when connecting lines.
6. Be sure to install the sensor and the insulator on the
place where they were before.
7. To install a new evaporator core, add 50cc (1.7 fl. oz.)
of new compressor oil to the new core.
8. Tighten the refrigerant lines to the specified torque.
Refer to
Main Data and Specifications for Torque
Specifications in this section.
9. Apply an adhesive to the parting face of the lining
when assembling the evaporator assembly.

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±53
Compressor
Service Precaution
WARNING: THIS VEHICLE HAS A SUPPLEMENTAL
RESTRAINT SYSTEM (SRS). REFER TO THE SRS
COMPONENT 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 ON-VEHICLE
SERVICE INFORMATION. FAILURE TO FOLLOW
CAUTIONS 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
When servicing the compressor, keep dirt or foreign
material from getting on or into the compressor parts and
system. Clean tools and a clean work area are important
for proper service. The compressor connections and the
outside of the compressor should be cleaned before any
ºOn±Vehicleº repair, or before removal of the
compressor. The parts must be kept clean at all times and
any parts to be reassembled should be cleaned with
Trichloroethane, naphtha, kerosene, or equivalent
solvent, and dried with dry air. Use only lint free cloths to
wipe parts.
The operations described below are based on bench
overhaul with compressor removed from the vehicle,
except as noted. They have been prepared in order of
accessibility of the components. When the compressor is
removed from the vehicle for servicing, the oil remaining
in the compressor should be discarded and new
compressor oil added to the compressor.
Compressor malfunction will appear in one of four ways:
noise, seizure, leakage or low discharge pressure.
Resonant compressor noises are not cause for alarm;
however, irregular noise or rattles may indicate broken
parts or excessive clearances due to wear. To check
seizure, de±energize the magnetic clutch and check tosee if the drive plate can be rotated. If rotation is
impossible, the compressor is seized. Low discharge
pressure may be due to a faulty internal seal of the
compressor, or a restriction in the compressor. Low
discharge pressure may also be due to an insufficient
refrigerant charge or a restriction elsewhere in the
system. These possibilities should be checked prior to
servicing the compressor. If the compressor is
inoperative, but is not seized, check to see if current is
being supplied to the magnetic clutch coil terminals.
The compressor oil used in the HFC±134a system
compressor differs from that used in R±12 systems.
Also, compressor oil to be used varies according to the
compressor model. Be sure to avoid mixing two or more
different types of oil.
If the wrong oil is used, lubrication will be poor and the
compressor will seize or malfunction.
DKV-14G Type Compressor
DKV±14G is equipped with five±vane rotary compressor.
These vanes are built into a rotor which is mounted on a
shaft.
When the shaft rotates, the vanes built into the cylinder
block assembly are operated by centrifugal force.
This changes the volume of the spare formed by the rotor
and cylinder, resulting in the intake and compression of
the refrigerant gas. The discharge valve and the valve
stopper, which protects the discharge valve, are built into
the cylinder block assembly. There is no suction valve but
a shaft seal is installed between the shaft and head; a
trigger valve, which applies back pressure to the vanes, is
installed in the cylinder block and a refrigerant gas
temperature sensor is installed in the front head.
The specified quantity of compressor oil is contained in
the compressor to lubricate the various parts using the
refrigerant gas discharge pressure.
871RX002

1A±64
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Automatic Air Conditioning System
General Description
Using a variety of sensors, this automatic air conditioner
accurately senses outside air temperature, solar
radiation quantity, evaporator's blowing temperature, and
interior temperature, then enters these data to the
automatic air conditioner control unit (equipped with the
built-in micro-computer). The data provided to the control
unit enables to automatically control blow temperatureand blow air quantity, turn on or off the compressor and
switch the blow port as well as switching between the
fresh air intake and interior air circulation.
Resetting the automatic function allows you to switch to
the manual control mode.
The self-diagnoisis function of the automatic air
conditioner control unit (with the built-in micro-computer)
allows the unit to access and diagnose a failed part easier
and quicker.
Automatic Air Conditioner Parts Configuration
865R200050
Legend
(1) In Car Sensor
(2) Sun Sensor
(3) Ambient Sensor
(4) Intake Actuator
(5) Blower Unit
(6) Max ± High Relay
(7) Display(8) Audio & Switch Assembly
(9) Evaporator Assembly
(10) Duct Sensor
(11) Mix Actuator
(12) Heater Unit
(13) Automatic Air Conditioner Control Unit
(14) Mode Actuator

1A±70
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Functions and Features
Automatic air conditioning control unit
The control unit features a prominent control and display
panel that clearly shows air conditioner operational
settings (delivered air volume, air outlet location,
inside/outside air circulation, and set temperature).
Desired temperature can be set in ±17
C (1
F)
increments. The current setting appears on the digital
display.
Automatic temperature control
Vehicle interior temperature is maintained at the set level.
It is unaffected by changes in vehicle speed, outside air
temperature, and number of passengers.
Maximum cooling and heating
Moving the switch to the 18
C (65
F) position provides
maximum cooling. Moving the switch to the 32
C (90
F)
position provides maximum heating.
Automatic air flow control
Air flow is automatically and precisely regulated in
response to set temperature change and/or changes in
heater unit mixing door aperture.
Automatic air outlet selection
Appropriate air outlets (VENT, BE-LEVEL, FOOT, or
DEF) are selected in response to changes in outlet
temperatures. The mode switch permits manual selection
of the desired air outlet.
Air source (Fresh air intake from outside the
vehicle or recirculation of the air inside the vehicle)
selection
Automatic switching between outside air (FRESH),
recirculated inside air (RECIRC), or a combination of the
two (MIX) occurs in response to changes in outlet
temperatures.The intake switch permits manual
selection of the air source (FRESH or RECIRC). Mixing
of the two sources is not possible during manual
operation. When the defrost mode switch (DEF) is
pressed, the system automatically switches to outside air
intake.
Cooler start-up control
When the vehicle is parked in a hot area for an extended
period of time, the evaporator becomes hot. When the
cooler is turned on, hot air is blown into the vehicle until
the evaporator cools down. The cooler start-up control
prevents blower operation until the evaporator is able to
provide cool air.
Heater start-up control
When the vehicle is parked in a cold area for an extended
period of time, the heater core becomes cold. When the
heater is turned on, cold air is blown into the vehicle until
the heater core heats up. The heater start-up control
prevents blower operation to the air outlets until the
heater core is able to provide warm air. Air is delivered
through the defrost outlets.
Solar radiation offset
The sun sensor uses a photodiode to precisely determine
the amount of solar radiation affecting the vehicle. The
cooler operates in response to this radiation to quickly
correct the vehicle interior temperature.Switch position memory
Current switch positions are stored in memory when the
ignition switch is turned off. When the ignition switch is
turned on again, the switches automatically return to the
position they were in when the ignition switch was turned
off. This simplifies the restarting procedure.
Self-diagnosis function
The self-diagnosis switches on the control panel permit
easy system troubleshooting. Refer to ªSelf-Diagnosisº
later in this Section.