Symptom Troubleshooting - Inspection Procedure No. 1

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Cannot communicate with tester Possible Cause
If communication between the HI-SCAN (Pro) tester and the A/T control unit is not possible, the diagnostic line may be faulty or the A/T control unit may not be operating. Diagnostic line malfunction, A/T control module power supply circuit malfunction, A/T control module ground circuit malfunction, A/T control module malfunction


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A quick Hyundai Elantra CN7 quiz: every answer comes with an explanation and a link to the manual page.