Checking The Auto-Cruise Control Vacuum Pump - Mitsubishi 1989-1993 GALANT Service Manual

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting

5. CHECKING THE AUTO-CRUISE CONTROL VACUUM PUMP

Ignition
switch <IG,>
c o n t r o l ' ""
unit
Auto-cruise
TSB Revision
Description of operation
Hold mode
When the SET switch is turned ON by the driver turning the
CRUISE switch ON when a determined speed is reached, the
control unit receives a set signal, and turns the auto-cruise
vacuum pump motor ON. After the constant speed is reached,
the motor, control valve and release valve are repeatedly turned
ON and OFF according to driving conditions.
Acceleration mode
When the RESUME switch is pressed, the control unit receives
a RESUME signal and it not only turns the auto-cruise vacuum
pump motor ON but also turns the control valve and release
valve ON (valve is closed)
Deceleration mode
When the SET switch is held down, the control unit receives a
set srgnal and it not only turns the auto-cruise vacuum pump
motor and control valve OFF (valve is opened) but also turns the
release valve ON (valve closed).
IS
Release mode
When the CRUISE switch is turned OFF, the control unit
receives a cancel signal and it not only turns the auto-cruise
vacuum pump motor OFF but also turns the control valve and
release valve OFF (valve is opened).
Troubleshooting hint
ECU terminal voltage