Check The Control Unit Power Supply Circuit; Checking The Set Switch - Mitsubishi 1989-1993 GALANT Service Manual

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
CHECK CHART
1. CHECKING THE CONTROL UNIT POWER SUPPLY CIRCUIT
Ignition
switch
I
control
switch I
Auto-cruise control unit

2. CHECKING THE SET SWITCH

I
Auto-cruise '
control unit
SET
control
switch
Description of operation
When the cruise control switch (CRUISE) is switched ON while
the ignition switch is ON, current flows to the ignition swrtch
(IG,), to fuse No.(ll) of the junction block, and to the
cruise-control switch (MAIN switch), the control unit, and to
ground.
When the ignition switch is turned OFF, the MAIN switch in the
cruise control switch is also turned OFF.
Troubleshooting hint
ECU terminal voltage
Terminal
NOTE
The connector Nos. in Section "AUTO-CRUISE CONTROL
l :
RELATED HARNESSES" and the connector names in the
junction block are represented.
(Applicable on the next page and subsequence.)
Description of operation
When the SET switch is switched ON (at the vehicle speed
desired to be maintained, and with the CRUISE switch of the
cruise-control switches ON) that vehicle speed is maintained as
a constant speed.
Furthermore, the constant speed is gradually reduced (the
"coasting" feature) when the SET switch is pressed and held
while the vehicle is traveling at the previously set constant
speed, and, when the SET switch is released, the vehicle then
maintains that newly set constant speed (the speed at which
the SET switch was released).
Current flows to the control unit. the cruise control switch
("SET"), and to ground.
Troubleshooting hint
ECU terminal voltage
Terminal
TSB Revision
Signal
No.
When the cruise-
2 Control unit
control switch
power supply
(CRUISE) is
switched ON.
Control unit At all times
ground
Signal
No.
SET switch
17 When the SET
switch is switched
ON.
When the SET
Conditions Terminal
voltage
Battery
positive
voltage
ov
Conditions Terminal
voltage
ov
Battery
positive
voltage