Mitsubishi 1989-1993 GALANT Service Manual page 479

AUTO-CRUISE CONTROL SYSTEM - Troubleshooting
Trouble symptom
Cannot decelerate by using the
SET switch
Cannot accelerate or resume
speed by using the RESUME
switch.
speed of less than 40 km/h (25
nph), or there is no automatic
neter
does not illuminate.
But auto-cruise control system is
Probable cause
Temporary damaged
or disconnected wir-
ing of SET switch
Actuator circuit poor
Malfunction of the
ECU
Damaged or discon- No. 3
short-circuit, of RE-
SUME switch input
circuit
Actuator circuit poor
Malfunction of the
actuator
Malfunction of the
ECU
vehicle-speed sensor
circuit
Malfunction of the
speedometer cable or
the speedometer
drive gear
Malfunction of the
indicator light
Harness damaged or
disconnected
TSB Revision
Check chart No.
No. 2
No. 5
No. 5
,
No. 4
Remedy
Repair the harness or
replace the SET
switch.
Repair the harness or
replace the actuator.
Replace the ECU.
Repair the harness or
replace the RESUME
switch.
replace the actuator.
Replace the ECU.
Repair the vehicle-
speed sensor system,
or replace the part.
Replace the ECU.
Repair the harness or
replace the light
bulb.