Mitsubishi 3000GT Service Manual page 474

17-14
ENGINE AND EMISSION CONTROL - Cruise Control System
DESCRIPTION OF OPERATION
The control switch is a switch in which the SET,
RESUME and CANCEL switches are integrated.
Therefore, different resistance values are used for
the individual switches to change the outputs (volt-
ages) to the control unit. Current flows through
fuse No. 4 of J/B and through the control switch
to the control unit.
1. SET switch
When the cruise control switch is ON, if the
SET switch is set to ON while vehicle speed
is within a range from about 40 to 145 km/h
(25 to 90 mph)*', 40 to 200 km/h (25 to 124
If the SET switch is kept at ON during cruise
operation, the vehicle coasts, and starts cruis-
ing at the speed reached when the SET switch
is set to OFF.
2. RESUME switch
Even if cruise operation is canceled, the vehicle
resumes cruising at the speed set before the
cancellation. Both when the main switch is set
TROUBLESHOOTING HINTS
Diagnosis No. 15 (Automatically canceled)
ECU terminal voltage
I
I
Terminal Signal name
No.
Control switch
18
to OFF and when the vehicle speed is reduced
to less than 40 km/h (25 mph), the vehicle
will not resume cruising at the previously set
speed even if the RESUME switch is set to
ON. If the RESUME switch is kept at ON during
cruise operation, the engine accelerates, and
the vehicle starts cruising at the speed reached
when the RESUME switch was set to OFF.
(However, when the vehicle speed is raised
to more than 145 km/h (90 mph)*', 200 km/h
(124 mph)*2, the vehicle cruises at approxi-
mately 145 km/h (90 mph)*', 200 km/h (124
3. CANCEL switch
When the CANCEL switch is set to ON during
cruise operation, the cancel signal is input to
the control unit which internally interrupts the
power supply to the vacuum pump assembly
for cancellation of cruise operation.
NOTE
Condition
When all switches are OFF
When SET switch is ON
When RESUME switch is ON
When CANCEL switch is ON
,
Terminal
voltage
o v
3 v
6V
Battery positive
voltage
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