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so last summer i was having an issue with my fuel pump not priming and i had to just reselect the key to "on" a couple times and it would kick on and fire up. well at the end of the summer it was getting worse and worse and now it wont turn on the pump at all. The fuel pump relay is FINE.
If i ground the ecu signal wire at the relay the relay clicks and pump turns on (the car wont run this way though. ecu doesnt want to give spark like this). The ecu is not sending the signal anymore. loose wire maybe? nope. here's the weird part, checking continuity between signal wire and ground, with ignition to "off" i have closed circuit and when i select ignition to "on" the circuit opens. so the ecu is basically doing the opposite of what it is supposed to do. im skeptical that it is anything to do with the wiring, i did the harness conversion myself soldered/heat shrink all connections. Not to mention i drove it for a year and a half probably about 7000km including a trip down to the states with no issues at all.
i think something is loose within the ecu, every signal being sent from ecu is intermittent and sporadic. the nissan datascan will only connect sometimes, before when it wasn't so bad i could connect nissan datascan use that to turn the pump on then start the engine. now when ever i do manage to connect and turn the pump off it will fire up for a second then shut off and loose connection with datascan.
i took the ecu apart and had a look, nothing looks melted or anything. gave the larger grounding points a light sand and added a good grounding wire to case ground it. no change. also with ignition in "on" if i move around the ecu the pump will sporadically turn on almost like a flutter its so fast.. any ideas?????? what are my options?
If i ground the ecu signal wire at the relay the relay clicks and pump turns on (the car wont run this way though. ecu doesnt want to give spark like this). The ecu is not sending the signal anymore. loose wire maybe? nope. here's the weird part, checking continuity between signal wire and ground, with ignition to "off" i have closed circuit and when i select ignition to "on" the circuit opens. so the ecu is basically doing the opposite of what it is supposed to do. im skeptical that it is anything to do with the wiring, i did the harness conversion myself soldered/heat shrink all connections. Not to mention i drove it for a year and a half probably about 7000km including a trip down to the states with no issues at all.
i think something is loose within the ecu, every signal being sent from ecu is intermittent and sporadic. the nissan datascan will only connect sometimes, before when it wasn't so bad i could connect nissan datascan use that to turn the pump on then start the engine. now when ever i do manage to connect and turn the pump off it will fire up for a second then shut off and loose connection with datascan.
i took the ecu apart and had a look, nothing looks melted or anything. gave the larger grounding points a light sand and added a good grounding wire to case ground it. no change. also with ignition in "on" if i move around the ecu the pump will sporadically turn on almost like a flutter its so fast.. any ideas?????? what are my options?
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