Mitsubishi 3000GT Service Manual page 472

ENGINE AND EMISSION CONTROL - Cruise Control System
CHECK CHART
1
inspection of control unit power supply circuit
DESCRIPTION OF OPERATION
The power is supplied through the ignition switch
unit.
1. When the cruise control main switch is set to
ON with the ignition switch at ON, the current
from switch S1 flows through relay Ry, in the
switch. Accordingly, the contact of relay Ryl
is closed and the power is supplied to the control
uhit.
2. When the main switch is released, it automati-
cally returns to the neutral position. Since the
current from switch S2 flows to relay Ryl, the
contact of relay Ryl remains closed.
3. When the main switch is set to OFF, current
to relay Ryl is interrupted. This opens the con-
IGNITION
SW ITCH
a
14 6
tact of relay Ryt to stop the power supply to
the control unit. When the switch is released,
it automatically returns to the neutral position,
but relay Ryl stays in the OFF state.
4. When the ignition switch is set to OFF while
relay Ryt in the main switch is ON, relay Ryl
is forced to the OFF state just 'like when the
main switch is set to OFF. Even if the ignition
switch is set to ON again, relay Ryl stays in
the OFF state until the main switch is set to
ON.
NOTE
The numbers beside each connector corre-
spond to those in the section (P.17-28) "HAR-
NESS AND COMPONENTS LAYOUT'.
I