lintlars Posted September 13, 2017 Share Posted September 13, 2017 (edited) Hi everyone I'm having some electrical issues that I'm hoping someone may have had before. Symptoms -Car quit and will not start, it turns over. - when I switch the car on and off fuel pump stays running until I pull the relay -replaced the relay same issue with the pump staying running with the key off I thought ECU -replaced ECU same issue Mods Car has a mapecu 1 installed I removed that from the equation same issue 12volt fuel mod single turbo NEW INFO PIN 69 ECU GROUND IS SHOWING 7 VOLTS WITH KEY OFF AND I HAVE SPARK Edited September 14, 2017 by lintlars MORE INFO (see edit history) Quote Link to comment Share on other sites More sharing options...
Ric Posted September 13, 2017 Share Posted September 13, 2017 the 12v fuel mod is why the fuel pump stays running. Very dangerous. Quote Link to comment Share on other sites More sharing options...
berg Posted September 13, 2017 Share Posted September 13, 2017 Even with 12v mod it should switch off when the key is off It only makes it run constant with the ignition on Quote Link to comment Share on other sites More sharing options...
Bladerider Posted September 13, 2017 Share Posted September 13, 2017 Has it got a kill switch ?? Quote Link to comment Share on other sites More sharing options...
lintlars Posted September 14, 2017 Author Share Posted September 14, 2017 Yeah it stays running with ignition off and the car wont start either No kill switch everything to that effect is stock I'm gonna check fuel and spark tonight Quote Link to comment Share on other sites More sharing options...
lintlars Posted September 14, 2017 Author Share Posted September 14, 2017 (edited) Pin 69 off the ecu is showing 7 volts with key in the off position!!!!! and I have spark Edited September 14, 2017 by lintlars more info (see edit history) Quote Link to comment Share on other sites More sharing options...
Gruwy Posted September 14, 2017 Share Posted September 14, 2017 I have had same issue on my 93' JDM NA Auto. Check out the fuel pump wiring and check the relay box for old soldering points... Anyways, I had my mechanic remake the fuel pump circuit, so I suggest to talk to local mechanic, he will find a way out. Quote Link to comment Share on other sites More sharing options...
lintlars Posted September 28, 2017 Author Share Posted September 28, 2017 I have had same issue on my 93' JDM NA Auto. Check out the fuel pump wiring and check the relay box for old soldering points... Anyways, I had my mechanic remake the fuel pump circuit, so I suggest to talk to local mechanic, he will find a way out. I removed all the fuse and replaced them one by one until I got voltage to the ground and it looks like efi 1 and 2 are the culprits, I disconnected my fuel pump ecu and still getting 7 volts to the ecu ground so Im gonna start at the fuel pump ecu and confirm all wiring is in good shape and then venture out from there back towards the ecu . Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted September 28, 2017 Share Posted September 28, 2017 If your getting voltage down to pin 69 which is the ECU ground then it might be worth checking all the ground points on the intake manifold/block/enginebayloom/footwell etc. Have had all sorts of weird issues in the past when one was left off Quote Link to comment Share on other sites More sharing options...
lintlars Posted October 18, 2017 Author Share Posted October 18, 2017 If your getting voltage down to pin 69 which is the ECU ground then it might be worth checking all the ground points on the intake manifold/block/enginebayloom/footwell etc. Have had all sorts of weird issues in the past when one was left off HAHAHA Guess what ground was left off the manifold !but what's odd is it ran for 3 weeks like this while doing some road tuning as well ! Its running good again but now my map I tuned to 11.5 is rich so needs another tune but all good again! Quote Link to comment Share on other sites More sharing options...
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