Hyundai Sonata 1991 Shop Manual page 175

AUTOMATIC SPEED CONTROL (CRUISE)
12. SELF-DIAGNOSIS FUNCTION
Y27ETOA
When there is a cancellation of the ASC system operation not intentionally made by the driver, it is possible
to determine which circuit or what operation caused the cancellation of the ASC system by (without stopping
the engine) stopping the vehicle (with the MAIN switch still ON) and then connecting a voltmeter and multi-use
tester to the diagnosis harness connector.
NOTE
The display of the malfunction data starts if the vehicle speed decreases to less than approximately 20
km/h (12 mph) after the cancelation of the ASC system function, and stops if the vehicle speed increases
to approximately 20 km/h (12 mph) or higher.
Self-diagnosis Descriptions and Displays
CODE NO. DIAGNOSIS ITEM DISPLAY PATIERNS
SELF-DIAGNOSIS DESCRIPTION
Display pattern (when ECU nor-
ON 0.5
11I
°.5
mal) when vehicle speed is approx-
-
-
(12V) Continuous
imately 20 km/h (12 mph) or
~
signal (0.5
OFF ......... ON °
higher, and before fixed-speed driv-
sec. ,.5
(OV)
sec. OFF)
ing has been set.
Actuator clutch
(Example) Code No. 13
Open brake switch, or open ECU
11
coil drive circuit
05hf·5
output transistor.
3 1.5 2 3
Vehicle-speed
ON
ITTj~.~
I
Vehicle speed signal is not input
12 signal circuit
(12V)
malfunction
for 0.5 second or longer.
OFF
Low-speed
(OV)
cb
@@
4:>
cb
When the vehicle speed decreases
13
limitter circuit
to 40 km/h (25 mph) or lower.
When actual vehicle speed
Redundant
CD
Pause time,3 seconds OFF
decreases to approximately 18
14
brake (3)
"Tens" rank signal: 1.5 seconds ON
km/h (11 mph) or more below the
(called "1O")
memorized vehicle speed.
@
Rank division: 2 seconds OFF
When the SET switch and the
15
Control switch
0
"Units" rank signal: 0.5 seconds ON
RESUME switch are switched ON
malfunction
0.5 seconds OFF
at the same time.
signal. (The number
of ON periods is
When the stop lamp switch, clutch
the number of
switch or inhibitor
switch is
16
When cancel
"unit" ranks.)
switched ON, or there is damaged
signal is input
or disconnected wiring between
the stop lamp switch and the ECU.
27-56