Mitsubishi 1989-1993 GALANT Service Manual page 493

AUTO-CRUISE
Auto-cruise control system cannot be set.
Prepare to conduct input check.
Where codes No.21, 22, 23, 25 and 26,
displayed when, with the vehicle stationary,
the input check codes were recalled?
No
Yes
Check results '
Code
21 remains even though SET
switch is set to OFF.
Code
22 remains even though
SUME switch is set to OFF.
Code 23 is not canceled even if the
stop light switch is turned OFF by
releasing the brake pedal.
Code 25 does not disappear, and
code 24 does not appear, even
though vehicle speed reaches appro-
Code 26 is not canceled even if the
clutch pedal position
OFF by releasing the clutch pedal.
Code 26 is not canceled even if the
ck the auto-cruise vacuum pump circuit.
CONTROL SYSTEM
NOTE
This chart is to be used, then, for troubleshooting if it is not
possible to use the on-board diagnostic for checking.
l
l
Probable cause
SET switch ON mal-
function
SET switch input line
short-circuit
RESUME switch ON
malfunction
RESUME switch input
line short-circuit
Malfunction of stop
light switch circuit.
Malfunction of the
vehicle-speed sensor
circuit (damaged or dis-
connected wiring, or
short-circuit)
Malfunction of clutch
switch is turned
pedal position switch
circuit.
Malfunction of park/
neutral position ,switch
circuit.
NOTE
If the results of the check of the auto-cruise vacuum pump
circuit (check chart No. 5) and of the auto-cruise vacuum pump
and actuator itself (P.13-401.) reveal no abnormal condition, re-
place the electronic control unit (ECU).
TSB Revision
Damaged or disconnected wiring of the ECU power-supply cir-
Damaged or disconnected wiring of the SET or RESUME
switch (Go to check chart 2 and 3.)
Damaged or disconnected wiring of the stop light switch,
clutch pedal position switch or park/neutral position switch (Go
Remedy
Repair the harness.
Replace the control
switch.
Repair the harness.
Replace stop light
switch or repair har-
ness.
Check or repair the
vehicle speed sensor
circuit.
Replace clutch pedal
position switch or repair
harness.
Replace park/neutral
position switch or repair
harness.
Check chart
No.
No. 2
No. 7