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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Brakes >> Traction Control >> ESC/AHB Diagnosis (HEV) >> DTC C1638-08: ACC Communication Error >> Component Inspection

Component Inspection

  1. Connect GDS and select "Diagnostic Trouble Codes (DTC)" mode.
  2. IG "ON".
  3. Using a GDS, Clear DTC.
  4. IG "OFF".
  5. Disconnect ECU's connector connected to CAN bus.
  6. Connect GDS and select "Diagnostic Trouble Codes (DTC)" mode.
  7. Are any DTCs present?

    YES 

    • Go to step  1 of the component inspection and disconnect another ECU's connector connected to CAN bus in step 5.
    • Repeat above step until test completed on all ECU in CAN bus.
    • If DTC is present after above test, Substitute with a known-good SCC and check for proper operation. If problem is corrected, replace SCC and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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