smukc Posted July 13, 2019 Report Share Posted July 13, 2019 Posted this in the other thread but noticed that it vas for vipec Hi i have problem with low vlotage on ecu but eccs relay is OK ( replaced and masured ) voltage sometimes drops as low as 9v if i conect original ecu voltage still drops but not so much 11.4v any ideas? car is s14a silvia with swaped rb25 det s2 i am chasing this electrical phantom for 2 days now and going nuts... I get this errors ( atached image ) and atached log of runing car Lem g3 updated to g4 with adaptalink Best regards Log 13-07-19 7;04;50 pm.llg Quote Link to comment Share on other sites More sharing options...
smukc Posted July 14, 2019 Author Report Share Posted July 14, 2019 Update: hardvired eccs and now i have same voltage on ecu but error on an volt 4 is still present sometimes lov sometimes high.. also i mesure the resistance on ground vires around 15ohm should i consider to wire new grounds ? or is it posible that contacts are bad? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 14, 2019 Report Share Posted July 14, 2019 What is AN Volt 4 function set to? I think from memory it is the narrowband oxy sensor so you will need to change the fault settings to low = 0.0V and high = 5.0V. Your resistance to ground doesnt sound right - how are you measuring this - between which pins/points? smukc 1 Quote Link to comment Share on other sites More sharing options...
smukc Posted July 14, 2019 Author Report Share Posted July 14, 2019 i have wideband conected to an v4 i will set the value to what you recomend. i mesured resistance betwen ecu ( not on adaptalink ) and chasis if this is not ok will direct conection on wires betwean ecu and adaptalink sort this problem out ? Quote Link to comment Share on other sites More sharing options...
smukc Posted July 14, 2019 Author Report Share Posted July 14, 2019 Update: I presed conector deeper in to the conection and the resistance on grounds is gone. But low voltage is still present, also on pin 16 i have same power as on the 59 (9-10v). When i hardwired the eccs relay the car could berely start and die right after. if i put everything back to original state( no hardwire ) when i turn the key fuel pump is runing all the time does not stop( priming in ecu is set to 3s) , when car starts sometimes it idles ok but when i touch the gas pedal some reley at my foot start kliking ( lhd ) and car dies or berely stays on and recover ( maybe fuel pump reley ? ) ... also ecu disconects while cranking engine... realy lost here Quote Link to comment Share on other sites More sharing options...
Simon Posted July 15, 2019 Report Share Posted July 15, 2019 Check the voltage across the ECCS relay it could be the relay Quote Link to comment Share on other sites More sharing options...
smukc Posted July 15, 2019 Author Report Share Posted July 15, 2019 Voltage drops on pin 5 at the relay. Tried couple of them ( all from the car so they were old ) they all drop voltage will buy a new relay and try with new one. Quote Link to comment Share on other sites More sharing options...
smukc Posted July 15, 2019 Author Report Share Posted July 15, 2019 i have mesured pins on eccs and pins on the ecu and mesurements are: ECCS reley: pin1=12.26v pin2=11.20v pin3= 12,26v pin5= 8.9v ECU: pins 49,109,59 and also at crank sensor all have 8.91v airflow meter is deleted ( i am using IAT sensor ) pin18= pin2 onfuel pump reley have 9.53 and fuel pump directly have 11.9v If i jump wire the eccs reley i get normal voltage ( same as batery ) but car dies or it leans out and dies... Quote Link to comment Share on other sites More sharing options...
Simon Posted July 15, 2019 Report Share Posted July 15, 2019 What is the terminal connection like on pin 5 of the relay if that was not making a good connection changing relay will have no effect as the issues is the actual terminal Quote Link to comment Share on other sites More sharing options...
smukc Posted July 16, 2019 Author Report Share Posted July 16, 2019 Terminal conection looks ok also contacts in there looks ok is it possible that some ground from the ecu is playing up... Quote Link to comment Share on other sites More sharing options...
Simon Posted July 16, 2019 Report Share Posted July 16, 2019 If you are measuring that voltage drop across the relay and using the same ground for each measurement then it is not ECU related. There is something up in that relay area. smukc 1 Quote Link to comment Share on other sites More sharing options...
smukc Posted July 17, 2019 Author Report Share Posted July 17, 2019 Yes i was mesuring on the same ground (attached to chasis ) Quote Link to comment Share on other sites More sharing options...
Simon Posted July 18, 2019 Report Share Posted July 18, 2019 In the ECU is it giving a low battery voltage or only the errors you showed in the first post? Quote Link to comment Share on other sites More sharing options...
smukc Posted July 18, 2019 Author Report Share Posted July 18, 2019 Only error showed in upper post, but ecu is reading the same voltage as i am messuring at the pin 5 on eccs reley Quote Link to comment Share on other sites More sharing options...
smukc Posted July 18, 2019 Author Report Share Posted July 18, 2019 So i cut the wire from pin 5 out from eccs and mesured pins on ecu 59, 109, 49 they stil have the same voltage oround 9v Quote Link to comment Share on other sites More sharing options...
smukc Posted July 21, 2019 Author Report Share Posted July 21, 2019 wired in ecu directly and now it is error free voltage is ok and car starts but dies right after ( but i think that this is a map foult ) Quote Link to comment Share on other sites More sharing options...
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