Mitsubishi 1992 3000GT, Service Manual

Page: 470 / 1308

ENGINE AND EMISSION CONTROL Cruise Control System
Trouble symptom Probable cause
Check chart No.
l
The set vehicle speed varies Malfunction of the vehicle
No.4
greatly upward or downward.
“Hunting” (repeated alternating
speed sensor circuit
l
acceleration and deceleration) Malfunction Of
the
occurs after setting is made.
speedometer cable or
speedometer drive gear
to 1993 models (Non
turbo)>
Vacuum pump assembly No.5
circuit poor contact
Malfunction of the vacu-
um pump assembly
(including air leaks from
negative pressure pas-
sage)
Malfunction of the ECU
The cruise control system is not Brake switch (for cruise No.6
canceled when the brake pedal is
control) malfunction
depressed. (short-circuit)
drive circuit short-circuit
Remedy
Repair the vehicle speed
sensor system, or replace
the part.
Repair the actuator
tern, or replace the part.
Replace the ECU.
Repair the harness or
place the stop light
switch.
Repair the harness or
lace the vacuum pump
is canceled, however, when the
pedal is depressed.)
brake pedal is depressed.)
SET switch.
disconnected wiring of
control switch input circuit
Repair the harness or
place the control switch.
NOTE
ECU: Electronic control unit
Vacuum pump assembly No.5
circuit poor contact
Malfunction of the
pump assembly
Malfunction of the ECU
Repair the harness or
place the vacuum pump
assembly.
Replace the ECU.
TSB Revision
I