tempy Posted April 10, 2012 Share Posted April 10, 2012 traced evap sol br/y wire to ecu have .3 ohmes we have continuity, but it will not lite a 12 volt bulb. put a meter across red/y and br/y = 12 volts put a bulb across it won't lite, put a wire to frame and red/y to bulb it lites br/y is supose tobe signal to ecu for sol. cel ,are there any electronic gurus here that can help sol meas. 27 ohmes will fire when using a batt and putting 2 wires to sol, got to get evap lite out for insp. does the sol grd. thru the mount somehow??? already resoldered power wire, like i said i have 12 volts just not grding Link to comment Share on other sites More sharing options...
nipper Posted April 10, 2012 Share Posted April 10, 2012 I can't really follow what you are saying. You do realise that everything on a subaru is switched on the low side of the load.... meaning : Voltage --to--- device---to--- switch (in this case the ECU) Link to comment Share on other sites More sharing options...
tempy Posted April 10, 2012 Author Share Posted April 10, 2012 yes if i turn my key on go back to evap sol. pull plug off, i have 12.8 volts putting one lead from meter on r/y wire and one lead on br/y,now if i take a 12 volt bulb and put r/y to filament and br/y to side of bulb grd it will not lite the bulb. if i take a wire from the frame to the side of the bulb it lites. it seems the ecu does not create a grd, i didn't try reading the b/y wire with on lead on the wire and the other to frame while hooked up to the solenoid Link to comment Share on other sites More sharing options...
Cougar Posted April 10, 2012 Share Posted April 10, 2012 (edited) If you did measure the voltage on the b/r while the light was tied to the wires you would have seen basically the same 12 volts you saw on the other side of the load. Like you stated, the return or ground side of the circuit isn't going to ground inside the ECU so no current can flow and cause a voltage drop across the load. There is either a problem with the ECU or the circuit isn't turned on. If you are sure the circuit should be turned on then the ECU has a bad driver for that function. Edited April 10, 2012 by Cougar Link to comment Share on other sites More sharing options...
tempy Posted April 10, 2012 Author Share Posted April 10, 2012 does that mean a new ecu or can the driver be programmed,the cel is out this morning we will see for the ride home I took the terminals out of the conn and pushed them onto the pins of the sol now i know i have a good connection Link to comment Share on other sites More sharing options...
Cougar Posted April 11, 2012 Share Posted April 11, 2012 (edited) If the solenoid circuit is supposed to be active and it isn't turning on due to a problem with the ground return for the circuit inside the ECU then the ECU will have to be replaced. Edited April 12, 2012 by Cougar Link to comment Share on other sites More sharing options...
lmdew Posted April 11, 2012 Share Posted April 11, 2012 have you checked to make sure the 12.8 Volts is getting all the way back to the ECU? Check out http://www.brighterideas.com Search You tube for LoadPro or TesLite. Link to comment Share on other sites More sharing options...
tempy Posted April 11, 2012 Author Share Posted April 11, 2012 it seems it was in the connector I removed the terminals from the conn. at the sol and pushed them directly on the sol terminals no cel has come on since Link to comment Share on other sites More sharing options...
Fairtax4me Posted April 12, 2012 Share Posted April 12, 2012 It will not light a bulb because the ECU switches ground for the solenoid. Power is constant with Key On. Evap solenoid testing is simple. Put the ECU in Test Mode by connecting the bright green plugs under the dash. Turn Key ON. Listen for solenoid to click. What is the exact code you were getting? Link to comment Share on other sites More sharing options...
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