Hyundai Sonata 1991 Shop Manual page 179

AUTOMATIC SPEED CONTROL (CRUISE)
TROUBLESHOOTING PROCEDURES
Y27EWOA
First, select the applicable malfunction symptom from the Trou-
ble Symptom Charts.
Conduct self-diagnosis check following the directions provided by
the charts.
Determine condition of all function circuits.
CAUTION
Because the computer (self-diagnosis) memory data will be
erased. when the system is unintentionally canceled during fix-
ed-speed driving the ignition switch and/or the cruise main
switch of the ASC system should not be switched OFF. and
the battery should not be disconnected.
1. Make following preliminary inspections.
1) Check to be sure that the installation of the actuator,
accelerator cables are correct, and that the cables and
links are securely connected.
2) Check to be sure that the accelerator pedal move
smoothly.
3) Adjust the cables so that there is not excessive tension
or excessive play to the accelerator cable.
4) Check to be sure that the ECU, actuator, cruise main and
control switch and the connector of each cancel switch
are connected securely.
2. Check in the sequence indicated in the Trouble Symptom
Chart.
3. If these checks indicate nothing abnormal, replace the ECU.
ASC : Automatic speed control
ECU : Electronic control unit
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