Isuzu Rodeo UE. Manual — part 68
4B–3
DRIVELINE CONTROL SYSTEM
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, condition
of 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
4B–4
DRIVELINE CONTROL SYSTEM
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 transfer
gear. 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 (retrial)
F04RX004
4B–5
DRIVELINE CONTROL SYSTEM
Warning at “4L” position :In view of the shifting
mechanism of transfer, the gear shifting from 4WD to
2WD at “4L” condition is impossible. Therefore, the
transfer position switch can not be turned off by 4WD
switch when vehicle is in “4L” condition. In the case this
condition continues for 2 seconds, the shifting to 2WD is
stopped and the indicator lamp’s blinking changes from
2Hz to 4Hz to notify driver of wrong operation.
Time Chart of Shifting from 4WD to 2WD at “4L” Condition
F04RX005
4WD out signal to other Electronic Hydraulic Control
Unit : ECU of shift on the fly sends 4WD out signal to
other Electronic Hydraulic Control Unit as below.
4WD out signal
(Period)
Vehicle Condition
Transfer position switch
Front axle switch
120 ms
2WD
2WD (Open)
2WD (Open)
240 ms
4WD
4WD (Close)
4WD (Close)
4B–6
DRIVELINE CONTROL SYSTEM
Functions of Indicator Lamp
Indication of vehicle condition : Indicator lamp is
controlled by ECU of shift on the fly and shows vehicle
conditions as below.
Indicator
Vehicle condition
4WD switch
Transfer position
switch
Front axle switch
Off
2WD
Off (Close)
2WD (Open)
2WD (Open)
On
4WD
On (Open)
4WD (Close)
4WD (Close)
Blink (2Hz)
Operating
On (Open)
4WD (Close)
2WD (Open)
Off (Close)
2WD (Open)
4WD (Close)
Blink (4Hz)
Stop operating
On (Open)
2WD (Open)
2WD (Open)
Off (Close)
4WD (Close)
4WD (Close)
Bulb check :The bulb of indicator lamp is checked for 2
seconds when ignition key is turned on.
Time Chart of Bulb Checking
F04RW004
Retrials from 2WD to 4WD :In cold weather or under
high speed condition, the gear shifting (engagement)
sometimes dose not complete by 3 trials. In such case,
the indicator lamp inform driver of this incident as
aforementioned chart (shown at Retrial in Outline of shift
on the fly system.)
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