[Main 9000 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos I was referring to measuring transistor resistance, Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Wed, 2 Nov 2005 13:42:45 In Reply to: BPC's all measure equal amount from 2.5 to 2.9 ohms, RayV, Wed, 2 Nov 2005 11:51:32 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

not the measurment across the BPC, which I figured that you had already done. BobS wrote: "The ECU boost valve drivers can be checked with the ignition key off. Check the resistance from ground to the outside contacts, it should be > 1 Meg ohm, anything less is suspect."

In very basic terms, a transistor can be thought of as an electrically operated "current faucet" - more voltage on the "handle" allows more current to pass through the faucet. It has been a long time since I have played with transistors, but I believe that what BobS is measuring is the resistance THROUGH the transistor when it is OFF (emitter to collector?). I imagine that this can be done by connecting an ohmmeter on each of the outer two wires on the cable that connects the ECU to the BPC - NOTE: any caveat that you want to, I have never done this and will not be responsible for any damage it causes (although I can't imagine how it could).

Perhaps someone else can chime in here, and/or if someone tells me which pins on the 1994 ECU are involved, I can measure my dead ECU for confirmation that resistance is altered.


posted by 129.188.33...

BobS post on measuring resistance

• My '95 Aero has a learning disability, RayV, Wed, 2 Nov 2005 05:42:51
  • Clearing with the ISAT, David Ingram, Wed, 2 Nov 2005 06:57:46
    • BTW, when i activate the "Boost Pressure Valve", RayV, Wed, 2 Nov 2005 07:39:37
  • Too anthropomorphic., R. Frist, Wed, 2 Nov 2005 06:23:28
    • LOL!!! Sorry! Keeps the blood flowing doesn't it?, RayV, Wed, 2 Nov 2005 06:34:14
      • ECU driver transistors? Pedal Switches? Cruise Control?, Bill Homer , Wed, 2 Nov 2005 07:11:21
        • Hi Bill. Fuse 5 remains good. Pulling W gets, RayV, Wed, 2 Nov 2005 07:20:04
          • Fuse 5 is not indicative, Bill Homer , Wed, 2 Nov 2005 09:19:08
            • The BPC test BobS recommends worked for me..., Noel, Wed, 2 Nov 2005 11:15:27
              • BPC's all measure equal amount from 2.5 to 2.9 ohms, RayV, Wed, 2 Nov 2005 11:51:32
                • I was referring to measuring transistor resistance,, Bill Homer , Wed, 2 Nov 2005 13:42:45 <-- Viewing This Message
                  • Re: I was referring to measuring transistor resistance,, BobS, Wed, 2 Nov 2005 19:28:07
                    • Well here are my readings from the BPC harness plug, RayV, Thu, 3 Nov 2005 11:54:33
                      • Sounds like a shorted transistor on green wire side, Bill Homer , Thu, 3 Nov 2005 13:05:32
                  • Thanks everyone. I'll give it a good look on Saturday., RayV, Wed, 2 Nov 2005 19:15:12
    • I ment BPC valve., R. Frist, Wed, 2 Nov 2005 06:28:30
  • Re: My '95 Aero has a learning disability, Bill U, Wed, 2 Nov 2005 06:18:53

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