neil brown Posted August 7, 2014 Report Share Posted August 7, 2014 put unit into car without 5a fuse on 14v line  turned on ignition and ecu powerd up and getting 10.6v back out the ecu on the 14v line in  ecu is doing everything that it is meant, put the 5a fuse back in and there is no affect on unit  is it possible it is getting a back feed from incorrect aux output configuration  its for a ver 4 impreza my98 car  aux 1 - isc close - swith to earth to operate - when not in use ouputs 12v aux 2 - isc open - switch to earth to operate- aux 3 - boost solenoid - switch to earth to operatre aux 4 - tacho output aux 5 - fuel pump relay - swich relay to earth to operate aux 6 - not used - aux 7 - check engine light aux 8 - purge solenoid  wee bit of help required Quote Link to comment Share on other sites More sharing options...
neil brown Posted August 7, 2014 Author Report Share Posted August 7, 2014 getting back feed via aux 1 and aux 2 which is isc open and close  can i fit a set of diodes to prevent the back feed of ecu Quote Link to comment Share on other sites More sharing options...
neil brown Posted August 7, 2014 Author Report Share Posted August 7, 2014 its ok solved now, found the isue Quote Link to comment Share on other sites More sharing options...
neil brown Posted August 8, 2014 Author Report Share Posted August 8, 2014 the g4 storm ecu states the 3 wire iscv must have resistance greater than 10 ohms  the subaru 3 wire iscv has resistance of 9 ohms on the coils  with this it is giving me a back feed and powering up the ecu from an aux output  can i use two relays for the ecu to switch which will in turn operate the iscv opening and closing functions as just tested my spare iscv to check on a battery which operated fine, or do i add in two 10 ohm 25 watt resistors to increase the resistance but will this make the opening /closing functions slower as only will get 6 volts across each coil and resistor  cheers neil Quote Link to comment Share on other sites More sharing options...
Simon Posted August 10, 2014 Report Share Posted August 10, 2014 The Subaru ISC will be fine. The resistance will not be the cause of the back feed. It is only an issue if the ECU powers when the key is off. There is a big section in the PCLink help file on how and why back feeds occur and how to avoid them. Quote Link to comment Share on other sites More sharing options...
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