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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Adaptive Front Lighting System Diagnosis (HEV) >> DTC B1304-87: Engine Speed Signal Fault >> Wiring Inspection >> CAN Communication Circuit Inspection >> AFLS Ecu ↔ EPCU

AFLS Ecu ↔ EPCU

  1. Ignition "OFF"
  2. Disconnect EPCU connector and AFLS ECU connector.
  3. Measure the resistance between CAN-HIGH, LOW terminal of IGPM harness connector and CAN-HIGH, LOW terminal of AFLS ECU harness connector.
  4. Measure the resistance between CAN-HIGH, LOW terminal of EPCU harness connector and CAN-HIGH, LOW terminal of AFLS ECU harness connector.

    Specification:  Below 1Ω

  5. Is the measured resistance within specification?

    YES 

    • Substitute with a known - good ECU (IGPM or EPCU) and check for proper operation. If the problem is corrected, replace ECU and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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