2002 ISUZU AXIOM relay

1A±112
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart B: Fan Does Not Rotate in MAX HI Mode
StepActionValue(s)Ye sNo
1Is the MAX-HI relay (C±35) normal?
ÐGo to Step 2
Replace the
relay
21. Turn on the ignition switch (the engine is run).
2. Set the fan switch to the MAX-HI.
Is there continuity between the harness side connector
terminal No.C36±2 and No.C35±5?
ÐGo to Step 4Go to Step 3
3Repair an open circuit between terminal No.C36±2 and
No.C35±5.
Is the action complete?
ÐGo to Step 3Ð
4Is there continuity between the harness side connector
terminal No.C35±1 and ground (No.C±10)?
ÐGo to Step 6Go to Step 5
5Repair an open circuit between terminal No.C35±1 and
ground (No.C±10).
Is the action complete?
ÐGo to Step 4Ð
6Is the battery voltage applied between the harness side
connector terminal No.C35±2 and ground?
ÐGo to Step 8Go to Step 7
7Repair an open circuit between terminal No.C35±2 and
No.F±7 fuse.
Is the action complete?
ÐGo to Step 6Ð
8Is the battery voltage applied between the harness side
connector terminal No.I19±2 and ground?
ÐGo to Step 10Go to Step 9
9Repair an open circuit between terminal No.C35±4 and
No.I19±2.
Is the action complete?
ÐVerify repairÐ
10Replace the auto air conditioner control unit.
Is the action complete?
ÐVerify repairÐ

1A±114
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Chart D: Fan Does Not Stop
StepActionValue(s)Ye sNo
11. Disconnect the max high relay, the power transistor
connector C±34 and the auto A/C control unit
connector I±20.
2. Turn on the ignition switch.
Does the blower motor stop?
ÐGo to Step 3Go to Step 2
2Repair a short circuit between connector No.C36±2
and No.C35±5, No.C36±2 and No.C34±1, or
No.C36±2 and I20±17.
Is the action complete?
ÐVerify repairÐ
3Is the max high relay normal? (Refer to the later section
on ªindividual inspectionº.
)ÐGo to Step 4
Replace the
relay
4Reinstall the max high relay.
Does the blower motor start operating?
ÐGo to Step 6Go to Step 5
5Repair a short circuit between connector No.C35±4
and No.I19±2.
Is the action complete?
ÐGo to Step 4Ð
6Is the power transistor normal? (Refer to the later
section on ªindividual inspectionº.
)
ÐGo to Step 7
Replace the
power
transistor
7Reinstall the power transistor.
Does the blower motor start operating?
Ð
Replace the
auto A/C
control unit
Ð

1A±116
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
ConditionPossible causeCorrection
Magnetic clutch does not workÐRefer to Chart A
Chart A: Magnetic Clutch Does Not work
StepActionValue(s)Ye sNo
1Is the fuse No.F±7 normal?
ÐGo to Step 2
Replace the
fuse
2Is the relay No.X±2 (compressor relay) No.X±8 (A/C
thermo relay) and No.X±1 (heater relay) normal?
ÐGo to Step 3
Replace the
relay
3Is there continuity between the pressure switch side
connector terminal No.C21±1 and No.C21±2?
ÐGo to Step 5Go to Step 4
4Pressure switch defective or refrigerant pressure
improper.
Pressure switch replaced or refrigerant pressure
adjusted?
ÐGo to Step 3Ð
51. Turn the ignition switch on. (the engine is run.)
2. Turn the air conditioner switch on.
Is the battery voltage applied between the harness side
connector terminal No.E2±1 and the ground?
ÐGo to Step 7Go to Step 6
6Magnetic clutch defective or earth defective.
Magnetic clutch replaced or earth replaced?
ÐGo to Step 5Ð
7Is there continuity between the harness side connector
terminal No.X2±1 and No.E2±1?
ÐGo to Step 9Go to Step 8
8Repair an open circuit between terminal No.X2±1 and
No.E2±1.
Is the action complete?
ÐGo to Step 7Ð
9Is the battery voltage applied between the harness side
connector terminal No.X2±5 and ground, No.X2±2 and
ground?
ÐGo to Step 11Go to Step 10
10Repair an open circuit between terminal No.X2±5 and
fuse No.F±7, No.X2±2 and fuse No.F±7.
Is the action complete?
ÐGo to Step 9Ð
11Is the battery voltage applied between the harness side
connector terminal No.I20±18 and ground?
ÐGo to Step 13Go to Step 12
12Repair an open circuit between terminal No.I20±18 and
No.X2±4.
Is the action complete?
ÐGo to Step 11Ð
13Is the battery voltage applied between the harness side
connector terminal No.C21±2 and ground?
ÐGo to Step 15Go to Step 14
14Repair an open circuit between terminal No.C21±2 and
fuse No.F±7.
Is the action complete?
ÐGo to Step 13Ð
15Is the battery voltage applied between the harness side
connector terminal No.X8±5 and ground, No.X8±2 and
ground?
ÐGo to Step 17Go to Step 16
16Repair an open circuit between terminal No.X8±5 and
No.C21±1, No.X8±2 and fuse No.F±7.
Is the action complete?
ÐGo to Step 15Ð

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

1A±120
HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Heater (X±1) And Compressor (X±2) Relay
1. Disconnect relays and check for continuity and
resistance between relay terminals.

For handling of these relays, refer to
Heater Relay
in this section.
C01R200011
Thermostat (X±8) Relay
1. Disconnect relays and check for continuity and
resistance between relay terminals.

For handling of these relays, refer to
Heater Relay
in this section.
C01R200012
Triple Pressure Switch
1. Disconnect the connector and check for continuity
between pressure switch side connector terminals (1)
and (2).
2. Reconnect the connector to activate the A/C switch,
and check to see if there is continuity between the
chassis side connector terminal (3) and (4) and the
fan operates.
875R200020

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A±121
On-Vehicle Service
Power Transistor
874R200014
Legend
(1) Glove Box
(2) MAX HI Relay
(3) Power Transistor Connector
(4) Power Transistor
Removal
1. Remove the glove box.
2. Remove the MAX±HI relay.
3. Disconnect the power transistor connector.
4. Remove the power transistor.
Installation
To install, follow the removal step in the reverse order.
Automatic Heater/Air Conditioner
Control Unit
865R200007
Legend
(1) Display
(2) Audio & Switch Assembly
(3) Automatic Air Conditioner Control Unit
(4) Knee Pad (RH)
(5) Center Cluster
(6) Center Cluster Upper
(7) Knee Pad (LH)
Removal
1. Disconnect the battery ground cable.
2. Remove the knee pad (R/LH).
3. Remove the center cluster upper.
4. Remove the center cluster.

Refer to
Instrument Panel Assembly in Body
Stractur section.
5. Disconnnect the six connectors.
6. Remove the automatic air conditioner control unit.
Installation
To install, follow the removal step in the reverse order.

5A±1
BRAKE CONTROL SYSTEM
AXIOM
BRAKES
CONTENTS
Brake Control System 5A±1. . . . . . . . . . . . . . . . . . . .
Anti±lock Brake System 5B±1. . . . . . . . . . . . . . . . . .
Power±assisted Brake System 5C±1. . . . . . . . . . . .
Parking Brakes (4x4 Model) 5D1±1. . . . . . . . . . . . . .
Parking Brakes (4x2 Model) 5D2±1. . . . . . . . . . . . . .
Brake Control System
CONTENTS
Service Precaution 5A±2. . . . . . . . . . . . . . . . . . . . . .
General Description 5A±3. . . . . . . . . . . . . . . . . . . . .
Functional Description 5A±4. . . . . . . . . . . . . . . . .
System Components 5A±10. . . . . . . . . . . . . . . . . . .
Electronic Hydraulic Control Unit (EHCU) 5A±10.
ABS Warning Light 5A±10. . . . . . . . . . . . . . . . . . . .
Wheel Speed Sensor 5A±10. . . . . . . . . . . . . . . . . .
G-Sensor 5A±10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Normal and Anti-lock Braking 5A±10. . . . . . . . . . .
Brake Pedal Travel 5A±10. . . . . . . . . . . . . . . . . . . .
Acronyms and Abbreviations 5A±11. . . . . . . . . . . .
General Diagnosis 5A±11. . . . . . . . . . . . . . . . . . . . . . .
General Information 5A±11. . . . . . . . . . . . . . . . . . . .
ABS Service Precautions 5A±11. . . . . . . . . . . . . . .
Computer System Service Precautions 5A±11. . .
General Service Precautions 5A±11. . . . . . . . . . . .
Note on Intermittents 5A±11. . . . . . . . . . . . . . . . . . .
Test Driving ABS Complaint Vehicles 5A±12. . . . .
ªABSº Warning Light 5A±12. . . . . . . . . . . . . . . . . . .
Normal Operation 5A±12. . . . . . . . . . . . . . . . . . . . .
Tech 2 Scan Tool 5A±13. . . . . . . . . . . . . . . . . . . . . .
DATA LIST 5A±16. . . . . . . . . . . . . . . . . . . . . . . . . . .
ACTUATOR TEST 5A±17. . . . . . . . . . . . . . . . . . . . .
Tech 2 Service Bleed 5A±21. . . . . . . . . . . . . . . . . .
Basic Diagnostic Flow Chart 5A±22. . . . . . . . . . . .
Basic Inspection Procedure 5A±23. . . . . . . . . . . . .
EHCU Connector Pin-out Checks 5A±24. . . . . . . . .
Circuit Diagram 5A±25. . . . . . . . . . . . . . . . . . . . . . .
Connector List 5A±28. . . . . . . . . . . . . . . . . . . . . . . .
Part Location 5A±29. . . . . . . . . . . . . . . . . . . . . . . . .
Symptom Diagnosis 5A±30. . . . . . . . . . . . . . . . . . . . .
Chart A-1 ABS Works Frequently But
Vehicle Does Not Decelerate 5A±30. . . . . . . . . . .
Chart TA-1 ABS Works Frequently But
Vehicle Does Not Decelerate
(Use TECH 2) 5A±31. . . . . . . . . . . . . . . . . . . . . . . .
Chart A-2 Uneven Braking Occurs While
ABS Works 5A±31. . . . . . . . . . . . . . . . . . . . . . . . . . .
Chart TA-2 Uneven Braking Occurs While
ABS Works (Use TECH 2) 5A±31. . . . . . . . . . . . . Chart A-3, TA-3 The Wheels Are Locked 5A±32.
Chart A-4 Brake Pedal Feed Is Abnormal 5A±32.
Chart A-5, TA-5 Braking Sound
(From EHCU) Is Heard While Not Braking 5A±33
Diagnostic Trouble Codes 5A±34. . . . . . . . . . . . . . . .
Diagnosis By ªABSº Warning Light
Illumination Pattern 5A±36. . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Codes (DTCs) 5A±37. . . . . . .
Chart B-1 With the key in the ON position
(Before starting the engine). Warning light
(W/L) is not activated. 5A±39. . . . . . . . . . . . . . . . .
Chart B-2 CPU Error (DTC 14 (Flash out) /
C0271, C0272, C0273, C0284 (Serial
communications)) 5A±39. . . . . . . . . . . . . . . . . . . . .
Chart B-3 Low or High Ignition Voltage
(DTC 15 (Flash out) / C0277, 0278 (Serial
communications)) 5A±40. . . . . . . . . . . . . . . . . . . . .
Chart B-4 Excessive Dump Time (DTC 17
(Flash out) / C0269 (Serial
communications)) 5A±40. . . . . . . . . . . . . . . . . . . . .
Chart B-5 Excessive Isolation Time
(DTC 18 (Flash out) / C0274
(Serial communications)) 5A±40. . . . . . . . . . . . . . .
Chart B-6 G-Sensor Output Failure
(DTC 21 (Flash out) / C0276
(Serial communications)) 5A±41. . . . . . . . . . . . . . .
Chart B-7 Brake Switch Failure
(DTC 22 (Flash out) / C0281
(Serial communications)) 5A±41. . . . . . . . . . . . . . .
Chart B-8 2WD Controller in 4WD Vehicle
Controller (DTC 13 (Flash out) / C0285
(Serial communications)), 4WD State Input
Signal Failure (DTC 24 (Flash out) / C0282
(Serial communications)) 5A±42. . . . . . . . . . . . . . .
Chart B-9 Pump Motor Failure
(DTC 32 (Flash out) / C0267, C0268
(Serial communications)) 5A±42. . . . . . . . . . . . . . .
Chart B-10 EHCU Valve Relay Failure
(DTC 35 (Flash out) / C0265, C0266
(Serial communications)) 5A±43. . . . . . . . . . . . . . .
Chart B-11 FL Isolation Solenoid Coil Failure
(DTC 41 (Flash out) / C0245, C0247
(Serial communications)) 5A±43. . . . . . . . . . . . . . .
Chart B-12 FL Dump Solenoid Coil Failure
(DTC 42 (Flash out) / C0246, C0248
(Serial communications)) 5A±43. . . . . . . . . . . . . . .

5A±16BRAKE CONTROL SYSTEM
DATA LIST
The data displayed by DATA LIST are as follows:
Display
ContentOK/NG Criteria for Data
Front Left Wheel Speed
Front Right Wheel Speed
Rear Wheel Speedskm/h (MPH)
Start the vehicle and make sure of linear change in
each wheel speed.

Turn each wheel by hand and make sure that each
speed data change.
Warning LampON/OFF
To be OFF usually
ABS StateON/OFF
To be OFF usually
ABS RelayActive/Inactive
To be Active usually
4 Wheel DriveActive/Inactive
2WD: Inactive

4WD: Active
Brake SwitchActive/Inactive
Inactive (Released)

Active (Pressed)
Brake Fluid LevelNormal or not
To be Normal usually
Return PumpActive/Inactive
To be Inactive usually
DRP (Dynamic Rear
Proportioning)Active/Inactive
To be Inactive usually
Rear Dump Valve CommandedActive/Inactive
To be Inactive usually
Rear Dump Valve Feedback
Rear Isolation Valve
Commanded
Rear Isolation Valve Feedback
FL Dump Valve CommandedActive/Inactive
To be Inactive usually
FL Dump Valve Feedback
FL Isolation Valve Commanded
FL Isolation Valve Feedback
FR Dump Valve CommandedActive/Inactive
To be Inactive usually
FR Dump Valve Feedback
FR Isolation Valve
Commanded
FR Isolation Valve Feedback
G±SensorVoltage
2.50V when vehicle is stopped
Battery VoltageVoltage
Between 10±16.9V