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Home >> Hyundai >> 2015 >> 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
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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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