Mitsubishi 3000GT 1991 Service Manual page 268

CRUISE CONTROL SYSTEM - Troubleshooting
Trouble symptom
Cannot accelerate or resume speed
by using the RESUME switch.
Even when CANCEL switch is set to
ON, cruise control is not canceled
(Cruise control, however, is
canceled when brake pedal is
depressed.)
The cruise control system can be set Malfunction of the
while traveling at a vehicle speed
of less than 40 km/h (25 mph), or
there is no automatic cancellation
at that speed.
The cruise control indicator light
of the combination meter does not
illuminate. (But cruise control
system is normal)
Cruise control ON indicator light
does not come on. (However, cruise
control is functional.)
Malfunction of control function by
ON/OFF switching of ELC 4 AA
accelerator switch.
(Non-operation of damper clutch,
2nd gear hold, etc.)
Overdrive is not canceled during
fixed speed driving <A/T>
No shift to overdrive during
manual driving. <A/T>
Probable cause
Open or short circuit in
RESUME switch circuit in
control switch
Vacuum pump assembly
circuit poor contact
Malfunction of the
vacuum pump assembly
(including air leaks
from negative pressure
passage)
Malfunction of the ECU
Open or short circuit
in CANCEL switch
circuit in control switch
Malfunction of the ECU
vehicle-speed sensor
circuit
Malfunction of the
speedometer cable or
the speedometer drive
gear <Non turbo>
Malfunction of the ECU
Damaged or disconnected
bulb of indicator light
Harness damaged or
disconnected
Malfunction of the ECU
Burned-out indicator light
bulb
Open or short circuit in
harness
Malfunction of circuit
related to accelerator
switch OFF function
Malfunction of the ECU
Malfunction of circuit
related to overdrive
cancellation, or mal-
function of ECU
TSB Revision
Check chart No.
Remedy
No. 2 Replace the control switch
No. 5
Repair the harness or
replace the vacuum pump
assembly.
Replace the ECU.
If the input check Replace the control switch
code No. 27 indicates
a malfunction.
No. 2
Replace the ECU
No. 4
Repair the vehicle speed
sensor system, or replace
the part.
Replace the ECU.
No. 3 Repair the harness or
replace the light bulb.
Replace the ECU.
No. 3 Repair the harness or
replace the main switch.
No. IO Repair the harness or
replace the part.
No. 11 Repair the harness or
replace the part.