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