677

UnclassifiedFuel

What This Code Means

Current consumption exceeds the DSE unit’s output specification; Fuel Relay Output not functioning for CAN ECU Power; CANbus communication interference or failure

Possible Causes

  • High current draw from engine starter solenoid
  • High current draw from fuel relay
  • Fuel Relay Output not configured correctly on applicable modules
  • Incorrect cable impedance
  • Improper screen/shield grounding

Suggested Actions

  1. 1Use an external slave relay
  2. 2Check that current consumption does not exceed the DSE unit’s output specification
  3. 3Configure the Fuel Relay Output to CAN ECU Power
  4. 4Use only screened 120 Ω impedance cable approved specifically for use in CANbus applications
  5. 5Connect the CANbus screen at one end only

ASK RUDY ABOUT THIS FAULT

Get a diagnosis walkthrough for 677 on your specific Deep Sea Electronics unit — cited to the OEM manual, not a forum guess.

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