check engine ISUZU AXIOM 2002 Service User Guide

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
50
C (122
F) check performance and movement of the
related parts according the following checklist.
Performance Check Using the Manual Switch
NoItemProcedureCriteriaNo.ItemConditionOperationCriteria
1
Air discharge
temperature
(Ai i d
Auto±switch ONSet temperature to
18
C (65
F).Cold air discharge.
1(Air±mix door
operation)Set temperature to
32
C (90
F).Hot air discharge.
2
Air discharge
volume (Fan
operation)Fan switch ON1. Set temperature to
25
C (77
F).
2. Press the OFF
switch.Fan does not operate. There is no
air discharge.
21. Set temperature to
25
C (77
F).
2. Press the fan 
switch.Fan operates. Fan speed increases
each time the switch is pressed (LO
to HI in 5 increments).
3
Air discharge
temperature
(Mode door
operation)Fan in manual
5±speed operation1. Set temperature to
25
C (77
F).
2. Press the mode
switch.
3. Move through the 5
modes
(VENT"BI±LEVEL
"FOOT"DEF/FO
OT"DEF).
Panel display lights for each
mode.

Air discharge outlet position
changes for each mode.
4
Inside/outside air
mode (Intake door
operation)Auto±switch ON1. Set temperature to
25
C (77
F).
2. Press the intake
switch.
3. Press the fan 
switch.
4. Set the fan to the
highest speed.
5. Press the intake
switch.
Intake switch LED turns from on
to off.

Air discharge sound changes.
5
CompressorOutside air
temperature above
0
C (32
F) and
vehicle interior at
normal temperature1. Set temperature to
25
C (77
F).
2. Press the OFF
switch.
3. Press the
auto±switch.
4. Press the air
conditioner switch.
When the auto±switch is
pressed, the LED in the air
conditioner switch turns on and
the compressor begins
operation.

When the air conditioner switch
is pressed, the LED in the air
conditioner switch turns off and
the compressor stops operation.

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 60±watt lamp approximately 15 cm from the
sun sensor.
NOTE: This procedure is best performed at night or in
a dark, unlit area.
Is the action complete?
ÐGo to Step 2Ð
2Simultaneously press and hold the RESET key and the
CLOCK key (display unit).
Move the starter switch to start the engine.
Does DIAG appear on the display?
ÐGo to Step 3
Replace
display unit
3Press the COMPUTER MODE key.
Does DIAG AIRCON appear on the display?
ÐGo to Step 4
Replace
audio unit
4NOTE: A '1' should appear in the set temperature
segment of the display.
Does '0' appear in the outside air segment of the
display?
ÐGo to Step 6Go to Step 5
5Repair or replace damaged parts.
NOTE: Refer to
Step 1 Trouble Code Table.
Is the action complete?ÐGo to Step 1Ð
6Press and release the  fan switch (one time only).
NOTE: A '2' should appear in the set temperature
segment of the display.
Does '0' appear in the outside air segment of the
display?
ÐGo to Step 8Go to Step 7
7Repair or replace damaged parts.
NOTE: Refer to
Step 2 Trouble Code Table.
Is the action complete?ÐGo to Step 1Ð
8Press and release the  fan switch (one time only).
NOTE:

Refer to
Step 3 Sensor Output Check for a sample
output value.

A '3' should appear in the set temperature
segment of the display.
Does the correct sensor output value appear in the
outside air segment of the display?
ÐGo to Step 10Go to Step 9
9Repair or replace damaged parts.
NOTE: Refer to
Trouble Spot Inspection.
Is the action complete?ÐGo to Step 1Ð
10Press and release the  fan switch one time only.
NOTE: Refer to
Step 4 (Operation Check) for display
readings and inspection steps.
Are all parts operating normally?
ÐGo to Step 12Go to Step 11

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 transistor
side terminals.
C01R200006
MAX HI Relay
1. Remove the MAX ± HI relay connector (C±35) from
the blower assembly.
2. Check the conduction between the MAX ± HI relay
side terminals.
C01R200011
In Car Sensor
1. Turn on the ignition switch (the engine is started).
Start the air conditioner in ªAutoº.
2. Make sure that the in car sensor suctions cigarette
smokes and such.
In Car Sensor
1. Dismount the in car sensor from the automatic
heater/air conditioner control unit. Connect (+) end
and (±) end of the battery to the aspirator motor side
terminals No.I17±1 and No.I17±2, respectively, then
check if the motor runs normally.
C01R200010

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.

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 55
C (130
F),
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.

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

POWER±ASSISTED STEERING SYSTEM2A±25
Inspection and Repair
Make all necessary adjustments, repairs, and part
replacements if wear, damage, or other problems are
discovered during inspection.
Rotor
442RS002Check that the groove in the vane is free from excessive
wear and that the vane slides smoothly. When part
replacement becomes necessary, the pump cartridge
should be replaced as a subassembly.
Vane
442RS003
Sliding faces of the vane should be free from wear.
(Particularly the curved face at the tip that contact with the
cam should be free from wear and distortion). When part
replacement becomes necessary, the pump cartridge
should be replaced as a subassembly.
Cam
The inner face of the arm should have a uniform contact
pattern without a sign of step wear. When part
replacement becomes necessary, the pump cartridge
should be replaced as a subassembly.
Side Plate
The sliding faces of parts must be free from step wear
(more than 0.01 mm), which can be felt by the finger nail.
The parts with minor scores may be reused after lapping
the face.
Relief Valve
The sliding face of the valve must be free from burrs and
damage. The parts with minor scores may be reused after
smoothing with emery cloth (#800 or finer).
Shaft
Oil seal sliding faces must be free from a step wear which
can be felt by the finger nail. Bushing fitting face must be
free from damage and wear.
O-ring, Oil Seal, Snap Ring
Be sure to discard used parts, and always use new parts
for installation. Prior to installation, lubricate all seals and
rings with power steering fluid.
Pressure Switch
Check the switch operation as follows:
With engine idling and A/C on, turn the steering wheel
fully to the left; compressor should interrupt and engine
idle speed will increase. Shut off A/C and again turn
steering fully to the left; engine idle will increase. If system
fails to function properly, disconnect connector at the
pressure switch and repeat system check while testing
continuity across disconnected SW connector.
Reassembly
1. Install oil seal to front housing. Be sure to discard
used oil seal, and always use new parts for
installation.
CAUTION: When installing the oil seal, be careful
not to damage the oil seal contacting surface of the
housing.
2. Install shaft assembly.

INTELLIGENT SUSPENSION3F±1
AXIOM
SUSPENSION
INTELLIGENT SUSPENSION CONTROL
CONTENTS
Service Precaution 3F±2. . . . . . . . . . . . . . . . . . . . . .
General Description 3F±2. . . . . . . . . . . . . . . . . . . . .
PIN ASSIGNMENT TABLE 3F±4. . . . . . . . . . . . .
System Components 3F±4. . . . . . . . . . . . . . . . . . .
Control Unit 3F±4. . . . . . . . . . . . . . . . . . . . . . . . . . .
Actuator 3F±4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjustable Damping Force Shock Absorber 3F±4
Warning Lamp 3F±4. . . . . . . . . . . . . . . . . . . . . . . .
Vertical G-Sensor 3F±5. . . . . . . . . . . . . . . . . . . . . .
Lateral G-Sensor 3F±5. . . . . . . . . . . . . . . . . . . . . .
Acronyms and Abbreviations 3F±5. . . . . . . . . . . .
General Diagnosis 3F±5. . . . . . . . . . . . . . . . . . . . . . .
General Information 3F±5. . . . . . . . . . . . . . . . . . . .
Service Precautions 3F±5. . . . . . . . . . . . . . . . . . .
Computer System Service Precautions 3F±5. . .
General Service Precautions 3F±5. . . . . . . . . . . .
Parts Handling 3F±5. . . . . . . . . . . . . . . . . . . . . . . .
FLASHING CODES 3F±6. . . . . . . . . . . . . . . . . . . .
CLEAR DTC 3F±7. . . . . . . . . . . . . . . . . . . . . . . . . .
INTERMITTENT CONDITIONS 3F±8. . . . . . . . .
BULB CHECK 3F±8. . . . . . . . . . . . . . . . . . . . . . . . .
DTC CHECK 3F±8. . . . . . . . . . . . . . . . . . . . . . . . . .
Connector List 3F±14. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC)
Identification 3F±16. . . . . . . . . . . . . . . . . . . . . . . . .
DTC2 Actuator Coil Over Current 3F±17. . . . . . . . . .
Circuit Description 3F±17. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±17. . . . . . . . . . . . . . . . . . . . . . . .
DTC3 Actuator Coil/Position Sensor Open
Circuit or Short 3F±19. . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±19. . . . . . . . . . . . . . . . . . . . . Diagnostic Aids 3F±19. . . . . . . . . . . . . . . . . . . . . . . .
DTC4 G-Sensor Open Circuit or Short 3F±22. . . . .
Circuit Description 3F±22. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±22. . . . . . . . . . . . . . . . . . . . . . . .
DTC5 Vehicle Speed Sensor Open Circuit
or Short 3F±23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±23. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±23. . . . . . . . . . . . . . . . . . . . . . . .
DTC6 Stop Lamp Switch Open Circuit
or Short 3F±25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±25. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±25. . . . . . . . . . . . . . . . . . . . . . . .
DTC7 Engine Speed Signal Open Circuit
or Short 3F±27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 3F±27. . . . . . . . . . . . . . . . . . . . .
Diagnostic Aids 3F±27. . . . . . . . . . . . . . . . . . . . . . . .
DTC9 Control Unit Abnormality 3F±28. . . . . . . . . . . .
Control Unit 3F±32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 3F±33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 3F±33. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Actuator 3F±34. . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 3F±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 3F±35. . . . . . . . . . . . . . . . . . . .
Installation 3F±35. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Shock Absorber 3F±36. . . . . . . . . . . . . . . . . . . .
Removal 3F±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection and Repair 3F±37. . . . . . . . . . . . . . . . . . . .
Installation 3F±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3F±8INTELLIGENT SUSPENSION
INTERMITTENT CONDITIONS
If the Warning Lamp flashes a diagnostic trouble code as
intermittent, or if after a test drive a DTC does not
reappear though the detection conditions for this DTC are
present: the problem is most likely a faulty electrical
connection or loose wiring. Terminals and grounds should
always be the prime suspect. Intermittents rarely occur
inside sophisticated electronic components such as the
Control Unit.
Use the DTC information to understand which wires and
sensors are involved.
When an intermittent problem is encountered, check
suspect circuits for:
1. Poor terminal to wire connection.
2. Terminals not fully seated in the connector body
(backed out).
3. Improperly formed or damaged terminals.
4. Loose, dirty, or corroded ground connections:
HINT: Any time you have an intermittent in more than
one circuit, check whether the circuits share a
common ground connection.
5. Pinched or damaged wires.
6. Electro-Magnetic Interference (EMI):
HINT: Check that all wires are properly routed away
from spark plug wires, distributor wires, coil, and
generator. Also check for improperly installed
electrical options, such as lights, 2-way radios, etc.
BULB CHECK
When the starter switch is turned on in the normal state,
the Control Unit turns on the Warning Lamp to check the
bulb. After the engine starts, the Warning Lamp turns off.
F03RY00003
DTC CHECK
1. Diagnosis Trouble Codes (DTC) have been identified
by FLASHING CODES.
2. You have written the list of the DTC. The order of the
malfunctions has no meanings for this Control Unit.
Usually only one or two malfunctions should be set for
a given problem.
3. Check directly the DTCs you identified. The DTC are
sorted by number:
DIAGNOSTIC TROUBLE CODES.

INTELLIGENT SUSPENSION3F±23
DTC5 Vehicle Speed Sensor Open Circuit or Short
Circuit Description
Output speed information is provided to the control unit by
the vehicle speed sensor. The vehicle speed sensor
produces a pulsing AC voltage. The AC voltage level and
number of pulses increases as the speed of the vehicle
increases. The control unit then converts the pulsing
voltage to vehicle speed.
Diagnostic Aids

Inspect the wiring for poor electrical connections
between the control unit 48 way connector and the
speed sensor connectors. Look for possible bent,
backed out, deformed, or damaged terminals. Check
for weak terminal tension as well.
Also check for a chafed wire that could short to bare
metal or other wiring. Inspect for a broken wire inside
the insulation.

When diagnosing for a possible intermittent short or
open condition, move the wiring harness while
observing test equipment for a change.
DTC5 Vehicle Speed Sensor Open Circuit or Short
StepActionValue(s)Ye sNo
11. Jack up and support the rear axle on the stand.
2. Change the transfer mode to 2WD, using TOD
switch on instrument panel.
3. Shift the transmission lever in a forward position
and rotate the rear wheels.
Does the speedo-meter operate?
ÐGo to Step 2Go to Step 3
21. Open the throttle and rev up engine speed.
2. Using a volt meter, measure the voltage between
the meter B connector I±23 terminals 7 and 16
(GND).
Does the voltage change alternately at the specified
values?
0V and 12VGo to Step 7Go to Step 5
31. Turn off the starter switch and disconnect the
control connectors C±46 and C±44.
2. Check the continuity between the vehicle speed
sensor connector terminal 3 and meter B connector
I±23 terminal 7.
Is there continuity?
ÐGo to Step 4Go to Step 6
41. Check the continuity between the control unit
connector C±46 terminal 1 and control unit
connector C±44 terminal 48.
Is there continuity?
ÐGo to Step 5Go to Step 6
5Repair or replace the vehicle speed sensor.
ÐGo to Step 8Ð
6Repair the circuit between the vehicle speed sensor
connector terminal 3 and the meter B connector I±23
terminal 7 or the circuit between the control unit
connector C±44 terminal 48 and the speed sensor
connector terminal 3.
ÐGo to Step 8Ð