Question about 2000 Harley Davidson FLHTCUI Electra Glide Ultra Classic
2000 FLHTCI repeatedly is burning out the ECU relay under the seat. Last one only made it 120 miles. What can cause ECU relay to burn out?
Remove your ECU relay and your ECM fuse. Do not do anything else before you do this! Verify that all your battery connections are tight and clean, next any grounds for lamps, etc. make sure they are tight too. Replace relay and then fuse. Carry an extra relay with you and see how it goes. A loose or bad ground can cause a voltage spike which kills relays, fuses, and other parts. good luck.
Posted on Aug 14, 2009
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Posted on Jan 02, 2017
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Following list of possible faults should help:-
Coolant sensor - engine is signaled as being 'cold' all the
time, not just at start up, causing ECU to set longer injection cycle
? Low coolant level can prevent sensor being able to detect coolant
? Faulty 'open' thermostat allows coolant to circulate without regulation
and perhaps prevents the engine from achieving normal running temperatures.
FPR - broken diaphragm allows fuel to enter
the vacuum line and then into the inlet manifold. Additional source of fuel
makes the fuel air mix richer causing a faster and lumpy idle.
Vacuum leak - 'high oxygen' signal
from O2 sensor causes ECU to set longer injection cycle.
O2 sensor - 'high oxygen' sensor error
causes ECU to set longer fuel injection cycle
MAF - 'over reads' in error the amount of air
entering causing ECU to set longer fuel injection cycle
IAT - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle
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