AUTO-CRUISE CONTROL SYSTEM Troubleshooting
Description of operation
switch
DC motor
coil
When (with the main switch ON) the driver
switches ON the SET switch when the pre-
scribed vehicle speed is reached, the control
unit sends current to the electromagnetic clutch
coil of the actuator, thus attracting the clutch
plate, and also illuminating the auto-cruise in-
dicator light, Then, when the ring gear of the
planetary pinion is secured, the control motor at
the same time causes the DC motor to be
switched ON, and the DC motor operates at
high speed.
2.
The rotation of the DC motor is, as described in
the illustration above, transmitted to the worm
gear, and thereafter to the worm wheel, the
sun gear,
and the planetary pinion in that
sequence. Because the ring gear is secured at
this time, the planetary pinion rotates while
revolving around the sun gear. Because the
planetary pinion is installed to the carrier, both
the carrier and the selecotr drive shaft unified
with it, as well as the selector, are caused to
rotate.
3.
The switching of the direction (PULL or
of
rotation of the selector is accomplished by
reversing the direction of current flow to the
motor, and this is automatically regulated by
the control unit.
4. The current flow to the electromagnetic clutch
is interrupted if the driver switches OFF the
main switch, or if the operation of the auto
cruise control system is
as a result of
the input of a cancel signal to the control unit
because the stop light switch, clutch pedal posi-
tion switch (for a manual transaxle) or the park/
neutral position switch (for an automatic trans-
axle) is activated.
5. As a result of the interruption of current to the
electromagnetic clutch, the clutch plate is
caused to return from the electromagnetic
clutch side to the ring gear side by the force of
the spring, and therefore the ring gear be-
comes free.
6. When the ring gear becomes free, the plane-
tary pinion becomes free relative to the sun
gear, and thus the selector is caused, by the
return spring installed to the selector part, to
return to its original position.
Troubleshooting hint
1 (automatically
ECU terminal voltage
Terminal
NO.
Signal
Conditions
Terminal voltage
8
Transistor for
When the cruise-control switch (main switch) is
magnetic
clutch coil
ed ON
o v
9
DC motor drive (“PULL”
During acceleration by RESUME switch
side)
DC motor drive
During speed reduction (coasting) by SET switch
side)
ov
DC motor drive (“PULL”
During acceleration by RESUME switch
side)
o v
DC motor drive
During speed reduction (coasting) by SET switch
side)
TSB Revision
Summary of Contents for 1989 Galant
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