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97 hx swapped my cabin harness with one out of a 2000 dx and have this extra plug for the fuel pump can’t figure out what it’s used for
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When I try and start it it will only start with me giving it throttle I can hear the fuel pump constantly priming itself like when you first turn the key
 

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Find those wires at the ecu plugs and look up a ecu pinolut and figure it out.

I advise to to at least know what it is. Sometimes it is handy to know if you have an ignition hot sitting there, making it super convenient to relay-power the fuel pump for extra life.
 
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