arkitekz Posted May 20, 2009 Report Share Posted May 20, 2009 My ecu stays on when the car is off and drains battery. Any suggestions on where I can tap into that has power at START, ON, and crank. Thanks. Quote Link to comment
Danfinny Posted June 17, 2009 Report Share Posted June 17, 2009 talk to inline4 he is the KA wire guy, he has rewired his like 4 time now lol J/K Joe Quote Link to comment
fo0manchu Posted June 18, 2009 Report Share Posted June 18, 2009 My ecu stays on when the car is off and drains battery. Any suggestions on where I can tap into that has power at START, ON, and crank. Thanks. you can run it straight into the ignition switch, thats what i did. Or wire up a relay. a volt meter is handy. Quote Link to comment
banzai510(hainz) Posted June 18, 2009 Report Share Posted June 18, 2009 straight into the ignition switch?????????? How about the blk/wht wire th powers the coil. That would be the correct way instead of hacking up a keyswitch wiring Quote Link to comment
philcas1987 Posted June 18, 2009 Report Share Posted June 18, 2009 The easy fix is to relay that circuit. When the ignition switch is turned off the relay would break the circuit. Also add a fuse to the mix. Quote Link to comment
Icehouse Posted June 18, 2009 Report Share Posted June 18, 2009 The injector wires (red, also memory for ecu) should have all time power the black w/white (in the KA harness) should be switched with the key. I bet that is your problem. Quote Link to comment
inline4 Posted June 19, 2009 Report Share Posted June 19, 2009 The injector wires (red, also memory for ecu) should have all time power the black w/white (in the KA harness) should be switched with the key. I bet that is your problem. is it that bad to kill power to the ecu and have no memory? Quote Link to comment
arkitekz Posted June 19, 2009 Author Report Share Posted June 19, 2009 hmm. the ecu memory and injectors have power all the time, wont that eventually drain battery? Quote Link to comment
fo0manchu Posted June 19, 2009 Report Share Posted June 19, 2009 straight into the ignition switch?????????? How about the blk/wht wire th powers the coil. That would be the correct way instead of hacking up a keyswitch wiring Whats wrong with splicing into the ignition switch wires? I've been running that for like a year now and no problems. The ecu doesn't draw that many amps. And we are talking about the "ignition switch on" power and not the constant right? Quote Link to comment
inline4 Posted June 19, 2009 Report Share Posted June 19, 2009 hmm. the ecu memory and injectors have power all the time, wont that eventually drain battery? not if you drive your car regularly :) Quote Link to comment
banzai510(hainz) Posted June 19, 2009 Report Share Posted June 19, 2009 "ignition switch on" power ??????? yes Quote Link to comment
Icehouse Posted June 19, 2009 Report Share Posted June 19, 2009 is it that bad to kill power to the ecu and have no memory? hmm. the ecu memory and injectors have power all the time, wont that eventually drain battery? not if you drive your car regularly :) That's how Nissan does it from the factory. My guess would be that the ECU memory takes about the same amount of power as a CD player memory. My truck is hooked up that way, even if I don't drive it for months the battery is fine. Quote Link to comment
fo0manchu Posted June 19, 2009 Report Share Posted June 19, 2009 "ignition switch on" power ??????? yes Hey Hainz, your talking about that #2 wire that comes off the ignition switch right? Quote Link to comment
banzai510(hainz) Posted June 20, 2009 Report Share Posted June 20, 2009 yes. I guess you can splice it form the key swithc but I like stock wiring. Just pull the blk/wht wire back to where your going to mount your relay box and use that as the controller and maybe the BLK/Blu wire is used for the START also. to power up something eleser in Jeffs Diagram, "Power when cranking" Quote Link to comment
fo0manchu Posted June 20, 2009 Report Share Posted June 20, 2009 Yah thats what I did. I guess I should have explained myself better. I followed that wire down a bit and then spliced into it. I didn't wire it directly into the switch. Quote Link to comment
compression Posted July 12, 2009 Report Share Posted July 12, 2009 is it that bad to kill power to the ecu and have no memory? The memory is only needed to store error codes, and some short term fuel trims, etc. There is a wire designated for constant +12v (battery) that handles powering it for that. The actual guts of the ECU are hard-programmed on an EPROM. PM me with your email address and I can send you the Engine control section from a 1995 240sx FSM. its all in there. Quote Link to comment
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