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Home >> Hyundai >> 2021 >> Veloster Turbo >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis - 1.6L (3 Of 3) >> DTC U0109-00: Lost Communication With Fuel Pump Control Module >> Wiring Inspection >> Circuit Inspection

Circuit Inspection

Item Normal value Prerequisite condition (+) Probe (-) Probe
Signal Circuit: Resistance (Open)
  • CAN HIGH Circuit
  • CAN LOW Circuit
Approx. below 1Ω
  1. Ignition switch: ON
  2. ECM, FPCM connector: Disconnected
CAN HIGH Terminal (ECM connector) CAN HIGH Terminal (FPCM connector)
CAN LOW Terminal (ECM connector) CAN LOW Terminal (FPCM connector)
  1. Is the result within specifications?

    YES 

    • Replace the FPCM with an usable one and check for proper operation. If the problem is corrected, replace the FPCM and then go to "VERIFICATION OF VEHICLE REPAIR ".

    NO