1998 ISUZU TROOPER instrument panel

AIR CONDITIONING 1B Ð 43
REMOVAL
Preparation:
·Disconnect the battery ground cable
·Discharge and recover refrigerant (Refer to
ÒREFRIGERANT RECOVERYÓ in this section.)
1. Front Console Assembly
2. Lower Cluster Assembly
3. Glove Box
4. Instrument Panel Passenger Lower Cover Assembly
5. Passenger Knee Bolster Reinforcement Assembly
·Refer to Section 10 ÒBODYÓ for INSTRUMENT
PANEL ASSEMBLY removal procedure.
6. Resistor and Electronic Thermostat Connector
7. Drain Hose
8. Refrigerant Line
·Use a back-up wrench when disconnecting and
reconnecting the refrigerant lines.
·When removing the refrigerant line connected part,
the connecting part should immediately be
plugged or capped to prevent foreign matter from
being mixed into the line.
9. Evaporator Assembly
INSTALLATION
To install, follow the removal steps in the reverse order,
noting the following points:
1. To install a new evaporator assembly, add 50cc
(1.4 Imp fl oz) of new compressor oil to a new core.
2. Tighten the refrigerant outlet line to the specified
torque.
Outlet Line Torque Nám (kgám / lbáft)
25 (2.5 / 18)
3. Tighten the refrigerant inlet line to the specified
torque.
Inlet Line Torque Nám (kgám / lbáft)
15 (1.5 / 11)
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.
Electronic thermostat
connector
Resistor connector

1BÐ126 AIR CONDITIONING
ON-VEHICLE SERVICE
Power Transistor
Legend
(1) Evaporator Assembly
(2) Passenger Knee Bolster Reinforcement
(3) Lower Cluster
(4) Front Console
(5) Glove Box
(6) Instrument Panel Passenger Lower Cover
(7) Power Transistor Connector
(8) Power Transistor
Removal
1. Remove front console.
2. Remove lower cluster.
3. Remove glove box.
4. Remove instrument panel passenger lower
cover.
5. Remove passenger knee bolster reinforcement.
6. Disconnect the power transistor connector.
7. Remove power transistor.
Installation
To install, follow the removal step in the reverse
order.
Automatic Heater/Air Conditioner Control
Unit
Legend
(1) Connector
(2) Automatic Heater / Air Conditioner Control
Unit
(3) Instrument Panel Cluster
(4) Set Screw
Removal
1. Disconnect the battery ground cable.
2. Remove instrument panel cluster.
·Refer to Instrument Panel Assembly in Body
Structure section.
3. Disconnect the automatic heater / air conditioner
control unit connector.
4. Remove automatic heater/ air conditioner
control unit.
Installation
To install, follow the removal step in the reverse
order.
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AIR CONDITIONING 1BÐ129
Mode Actuator
Legend
(1) A/T Control Unit
(2) Mode Actuator
(3) Actuator Rod
Removal
1. Disconnect the battery ground cable.
2. Remove the A/T control unit.
·The connector shall remain connected.
3. Remove the actuator rod.
4. Remove the mode actuator.
Installation
To install, follow the removal step in the reverse
order.
MIX Actuator
Legend
(1) Instrument Panel Assembly
(2) Instrument Panel Center Bracket
(3) Actuator Rod
(4) Mix Actuator
Removal
1. Disconnect the battery ground cable.
2. Remove the instrument panel assembly.
·Refer to the Instrument Panel Assembly in
Body Structure section.
3. Remove the instrument panel center bracket.
4. Remove the actuator rod.
5. Remove the mix actuator.
Installation
To install, follow the removal step in the reverse
order.
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4B1±2
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly System (Lever Type)
Outline of Shift on the Fly System
(Lever Type)
The shift on the fly system (Lever type) switches between
2 wheel drive (2WD) and 4 wheel drive (4WD) by driver's
shifting the transfer control lever on the floor.
This system controls below operations.
1. Connecting front wheels to, and disconnecting them
from, the front axles by vacuum actuator.
2. Indicator on instrument panel.
3. 4WD signal to Electronic Hydraulic Control Unit for
brake system (If anti±lock brake system is equipped).

4B1±7 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Shift on the Fly System (Push Button Type)
Outline of Shift on the Fly System (Push Button Type)
The shift on the fly system switches between 2 wheel
drive (2WD) and 4 wheel drive (4WD) electrically by
driver's pressing the 4WD switch (push button type) on
instrument panel.
This system controls below operations. (Shifting between
ª4Hº and ª4Lº must be performed by transfer control lever
on the floor.)
1. Shifting the transfer front output gear (Connecting to,
and disconnecting from, front propeller shaft by motor
actuator).2. Retrial of shifting the transfer front output gear.
3. Connecting front wheels to, and disconnecting them
from, the front axles by vacuum actuator.
4. Indicator on instrument panel.
5. 4WD out signal to other Electronic Hydraulic Control
Unit (If anti±lock brake system is equipped).
System Diagrams
412RW050

4B1±8
DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Normal Operation
The motor actuator mounted on transfer rear case is
driven by signal from 4WD switch on instrument panel.
After complete the connecting transfer front output gear
to, or disconnecting it from, front propeller shaft, conditionof the transfer position switch changes. The vacuum
solenoid valve (VSV) is driven by the signal from transfer
position switch and the vacuum actuator connects front
wheels to, or disconnect them from, front axles.
Time Chart of Shifting Under Normal Condition
F04RW002

4B1±9 DRIVE LINE CONTROL SYSTEM (SHIFT ON THE FLY)
Retrial
The motor actuator starts transfer gear shifting after
signal from 4WD switch on instrument panel has been
received. But the shifting may be impossible in cold
weather or under high speed condition. When 2 seconds
have passed since transfer gear shifting started and the
transfer position switch dose not turn on (the gear
engagement is not completed), the motor reverses its
rotation for 1.2 seconds and tries again to shift transfergear. This procedure is repeated 3 times in maximum.
While this procedure, 4WD indicator lamp blinks by 2 Hz.
If the transfer position switch does not turn on after
aforementioned procedure has been repeated 3 times,
the gear shifting is stopped and 4WD indicator lamp's
blinking changes from 2Hz to 4Hz to notify driver that the
gear shifting is stopped. This blinking of indicator lamp
continues until 4WD switch is returned from 4WD to 2WD.
Time Chart of Shifting Under Severe Condition (re-
trial)
F04RW003

4B2±3 DRIVE LINE CONTROL SYSTEM (TOD)
detects the slip condition, determines the optimum torque
based on the feedback control logic, and increases the
torque to the front wheels.
The control unit uses the signal from the throttle position
sensor to predict the future vehicle condition and the
intention of the driver with respect to acceleration and
deceleration, and determines the initial torque distribution
using these data and the information from the speed
sensors.
In case of small circle turning in the parking lot, for
example, the control unit minimizes the clutch pressing
force restrict a braking phenomenon. When the ABS
becomes active, the control unit optimizes the clutch
pressing force to ensure stable braking.
TOD Indicator Control
The TOD indicator on the instrument panel informs the
driver of the current working status of the transfer unit.
The information consists of two items: the drive mode
(2H, TOD, 4L, transition) and the torque split status of the
TOD (torque distribution level). The indicator can display
occasional errors and corresponding error codes.