Hyundai Tiburon 2003 Workshop Manual page 343

INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication with Hi-Scan (Pro) is not possible.
(Communication with any systems is not possible.)
Possible defect in the power supply system (including ground) for the
diagnosis line.
Inspection Procedure 2
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Probable cause
• Faulty power source circuit
• Faulty diagnosis line
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