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Home › Hyundai › 2016 › Equus Signature › Repair and Diagnosis › Engine Performance › System › Engine Control System Diagnosis (3 Of 3) › DTC U0109: Lost Communication With Fuel Pump Control Module › Wiring Inspection › CAN Communication Circuit Inspection

CAN Communication Circuit Inspection

  1. IG "OFF" and disconnect FPCM connector and ECM connector.
  2. Check resistance between CAN-HIGH terminal of FPCM Connector and CAN-HIGH terminal of harness connector. (Measurement "A")
  3. Check resistance between CAN-LOW terminal of FPCM Connector and CAN-LOW terminal of harness connector. (Measurement "B")

    Specification:  below 1.0Ω

  4. Is the measured resistance within specification?

    YES 

    • Substitute with a known-good FPCM and check for proper operation. If the problem is corrected, replace FPCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

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