Mitsubishi 1989 Galant, Service Manual

Page: 499 / 1273

AUTO-CRUISE CONTROL SYSTEM
Troubleshooting
6. CHECKING THE STOP LIGHT SWITCH CIRCUIT
Stop
Sub fusible link
Stop
Auto-cruise
control unit
Description of operation
When the brake pedal is depressed during constant-speed
travel, the stop light
(NC) contacts for the
control system open, with the result that the current to the
auto-cruise vacuum pump is interrupted, thus canceling the
constant-speed travel.
At the same time, moreover, the closing of the (NO) contacts
for the stop light results in the sending of the cancel signal to
the control unit, so that the auto-cruise vacuum pump current is
discontinued within the control unit, thereby canceling the
constant-speed travel.
The flow of current is from the sub fusible link to fuse No.
of the junction block, the stop light switch, and the control
Troubleshooting hint
ECU terminal voltage
Terminal
Signal Conditions Terminal
No.
voltage
15
Stop light When the brake Battery
switch (load pedal is depressed.
positive
side)
voltage
When the brake
ov
pedal is not
depressed.
NOTE
NC: Indicates ON at all
(For cruise control)
NO: Indicates OFF at all times. (For stop light)
7. CHECKING THE PARK/NEUTRAL POSITION SWITCH CIRCUIT <A/T>
Description of operation
The park/neutral position switch also functions as the switch
for the starter. If the selector lever is moved to the “N”
during constant-speed travel, current flows to the
unit, park/neutral position switch, starter motor, and to
ground; the cancel is therefore input to the control
unit, thus canceling the constant-speed travel.
Troubleshooting hint
ECU terminal voltage
Starter
motor
TSB
Revision