AUTO-CRUISE
CONTROL SYSTEM
Troubleshooting
NOTE
Auto-cruise control system cannot be set.
This chart is to be used, then, for troubleshooting if it is not
possible to use the on-board diagnostic for checking.
Prepare to conduct input check.
Where codes
22, 23, 25 and 26,
displayed when, with the
stationary,
the input check codes were recalled?
Damaged or disconnected wiring of the ECU power-supply
l
Damaged or disconnected wiring of the SET or RESUME
switch (Go to check chart 2 and 3.)
l
Damaged or disconnected wiring of the stop light switch,
clutch pedal position switch or park/neutral position
(Go
Are the results of all input checks normals?
Yes
No
ck the auto-cruise vacuum pump circuit.
(Go to check chart
TSB Revision
Check results
Probable cause
Remedy
Check chart
No.
Code
21 remains even though SET
switch is set to OFF.
SET switch ON
function
SET switch input line
short-circuit
the control
Repair the harness.
No. 2
Code
22 remains even though
SUME switch is set to OFF.
RESUME switch ON
Replace the control
malfunction
switch.
RESUME switch input
Repair the harness.
line short-circuit
Code 23 is not canceled even if the
Malfunction of stop
Replace stop light
stop light switch is turned OFF by
light switch circuit.
switch or repair
releasing the brake pedal.
ness.
Code 25 does not disappear, and
Malfunction of the
Check or repair the
code 24 does not appear, even
vehicle-speed sensor
vehicle speed sensor
though vehicle speed reaches
circuit (damaged or
circuit.
40 km/h (25 mph) or higher.
connected wiring, or
short-circuit)
Code 26 is not canceled even if the
Malfunction of clutch
Replace clutch pedal
clutch pedal position
switch is turned
pedal position switch
position switch or repair
OFF by releasing the clutch pedal.
circuit.
harness.
Code 26 is not canceled even if the
Malfunction of park/
Replace park/neutral
No. 7
lever is moved to anything but
neutral position
position switch or repair
circuit.
harness.
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
reveal no abnormal condition, re-
place the electronic control unit (ECU).
Summary of Contents for 1989 Galant
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