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    Thread: No power to ECU.

    1. Member GTIVRon's Avatar
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      02-16-2012 10:05 PM #1
      Hey guys. Car in question is a 92 Corrado with a distributor VR6.

      I removed the ECU connector to check continuity between the harness and my cam position sensor. I then wanted to check frequency (pulse trigger) but the only way to get access to that wire while connected to the ECU was to pull the ECU out. I pulled it out and reconnected it, and the car would not start.

      I have no power going to the ECU. I checked the relay in position 3 (109 relay) and it works just fine. (Checked resistances etc with and without 12v applied. Relay is working properly)

      What else could have happened? I'm dumbfounded.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
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    2. Member mk3alltheway's Avatar
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      02-16-2012 10:09 PM #2
      I once disconnected the 42 pin connector and in doing so loosened one of the pins from the terminal. Took quite a bit of troubleshooting to find that one

    3. Member Scotty_2.0's Avatar
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      02-16-2012 10:11 PM #3
      What was the original problem, I mean why were you checking the wiring?
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    4. Member Scotty_2.0's Avatar
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      02-16-2012 10:13 PM #4
      Quote Originally Posted by mk3alltheway View Post
      I once disconnected the 42 pin connector and in doing so loosened one of the pins from the terminal. Took quite a bit of troubleshooting to find that one
      You make a good point. The round 42-pin on the side of the head is known to have pins unlock from inside the connector and push themselves out preventing proper contact.
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    5. Member Deezy's Avatar
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      02-16-2012 10:51 PM #5
      Sunroof? Check that fuse if so.
      Bags are for groceries.... I My Dub, So does your girl.
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    6. Member GTIVRon's Avatar
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      02-16-2012 10:52 PM #6
      I didn't touch the 42 pin connector.

      I am doing any trouble shooting I can regarding my cam position sensor code before I go ahead and pull the intake mani/valve cover off to check cam timing. Want to make sure I have ruled out any other possibility.

      On another front.. With key on I get power to everything in the car, but noticed that along with no power to the ecu, my fuel pump relay doesn't click on either. I tested the relay and it is also working fine.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
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    7. Member GTIVRon's Avatar
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      02-16-2012 10:54 PM #7
      Quote Originally Posted by Deezy View Post
      Sunroof? Check that fuse if so.
      What?

      Sunroof still works. Everything in the car works. It just won't start. So far have determined I'm not getting power to the ECU or Fuel pump relay.

      Getting colder, it's dark, and late. I will be out of town this weekend, and again for work all next week. Maybe I'll get a nice surprise and somebody will have stolen it by the time I get back. This car has been a headache every day since the day I got it.
      Last edited by GTIVRon; 02-16-2012 at 10:58 PM.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

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      02-16-2012 11:07 PM #8
      Was your battery plugged in when u disconnected it and connected it again? I once fried a ecu in a pontiac like that. Or at least that's what happened. Assuming u know someone else with a dub, get 1 out of a car u know works and test it out, you never know.
      Last edited by DvwC; 02-16-2012 at 11:10 PM.

    9. 02-16-2012 11:18 PM #9
      When a cam sensor code comes on it usually means that the timing is off.

    10. Member GTIVRon's Avatar
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      02-16-2012 11:21 PM #10
      Quote Originally Posted by DvwC View Post
      Was your battery plugged in when u disconnected it and connected it again? I once fried a ecu in a pontiac like that. Or at least that's what happened. Assuming u know someone else with a dub, get 1 out of a car u know works and test it out, you never know.
      I'm not even getting power to the ECU. When I measure across the outside pins (can't remember the numbers, 1 and 23 i think) I get nothing at all.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    11. Member Scotty_2.0's Avatar
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      02-16-2012 11:50 PM #11
      Don't wanna come across as a a$$, but you did check the ECU fuse right? I say this cause you didn't mention it and its easy to over look.
      /// VRSociety Member #298 /// bankrupt ///

    12. 02-17-2012 12:25 AM #12
      http://www.a2resource.com/electrical...nicvr6aba.html
      Check the main power first pin 54 then 23 with ign on, 9 with ign on. Pin 1 is a ground.

    13. Member GTIVRon's Avatar
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      02-17-2012 08:30 AM #13
      Quote Originally Posted by Scotty_2.0 View Post
      Don't wanna come across as a a$$, but you did check the ECU fuse right? I say this cause you didn't mention it and its easy to over look.
      That was my first thought. If you can tell me where it's at I'd greatly appreciate it, because the bentley makes no mention of this. Next thing I looked for was if there was a relay, and found that one...

      Quote Originally Posted by brian500 View Post
      http://www.a2resource.com/electrical...nicvr6aba.html
      Check the main power first pin 54 then 23 with ign on, 9 with ign on. Pin 1 is a ground.
      Thanks for the link! I'll check those and report back if it's not raining when I get home.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    14. Member Scotty_2.0's Avatar
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      02-17-2012 09:27 AM #14
      Quote Originally Posted by GTIVRon View Post
      That was my first thought. If you can tell me where it's at I'd greatly appreciate it, because the bentley makes no mention of this. Next thing I looked for was if there was a relay, and found that one...
      Fuse 15 (10A - red).
      /// VRSociety Member #298 /// bankrupt ///

    15. Member GTIVRon's Avatar
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      02-17-2012 12:00 PM #15
      Quote Originally Posted by Scotty_2.0 View Post
      Fuse 15 (10A - red).
      That fuse is good. But I don't think it was for the ECU. Can't remember what the Bentley said it's for though. All the fuses in that fuse panel are good though.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    16. Member GTIVRon's Avatar
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      02-17-2012 01:14 PM #16
      Quote Originally Posted by brian500 View Post
      http://www.a2resource.com/electrical...nicvr6aba.html
      Check the main power first pin 54 then 23 with ign on, 9 with ign on. Pin 1 is a ground.
      23 never gets power. 9 gets power whether ignition is on or off, always hot. 54 gets power with ignition on only. Will this help you help me? Please say yes!

      Thanks for the help man.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    17. Member Deezy's Avatar
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      02-17-2012 03:00 PM #17
      Quote Originally Posted by GTIVRon View Post
      23 never gets power. 9 gets power whether ignition is on or off, always hot. 54 gets power with ignition on only. Will this help you help me? Please say yes!

      Thanks for the help man.
      If you read that link... 23... check engine electronics relay. Fuse 15 hot on both sides.
      Bags are for groceries.... I My Dub, So does your girl.
      ---WacoDubs---

    18. 02-17-2012 04:39 PM #18
      Fuse 15 is for obd2 only. I would try a different ign switch just unplug it and put the new switch in take a flat head and turn it on. Also if you have a 109 relay laying around try that as well.


    19. 02-20-2012 08:41 PM #20
      Spencer check your thread.

    20. Member GTIVRon's Avatar
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      02-21-2012 02:35 PM #21
      I have not had a chance to work on the car. Out of town all this week.

      I'll have to try the ignition switch next... I tested relay 109 and it worked. It also did it's job in the car (I took the cover off and plugged it in, then visually checked to see the contact closing).

      Will post what I find this weekend.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    21. Member GTIVRon's Avatar
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      02-24-2012 11:06 PM #22
      So after some more studying and flipping of pages through my phone book (Corrados bentley manual), I figured that it wouldn't be the ignition switch since it powers the 109 solenoid to send out power. Problem is I couldn't find anything regarding pin 23 and when it gets power.

      I decided to open up the ECU to see if I could find anything burnt up. After about 12 seconds I found the problem. My chip (car has an autothority chip!) had somehow lifted part way out of the socket. Like 1/3 of the legs were no longer making contact with the socket. Secured it ...securely.. and put everything back together. Car now runs just like before.

      Thanks for all the input you guys gave! Thats why I love coming to the Technical boards.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    22. Member Scotty_2.0's Avatar
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      02-24-2012 11:44 PM #23
      Wow, nice work. Thanks for updating with your findings
      /// VRSociety Member #298 /// bankrupt ///

    23. Member GTIVRon's Avatar
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      02-25-2012 12:37 AM #24
      Yea. I have learned so damn much thanks to this forum, I like to help whenever possible. And posting a solution to the problem is always great. Those were the useful threads when searching, so many times I'd find a thread regarding a problem I might of had, and there was never a posted solution...
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Dead. Will be back.. stronger.
      2012 Golf R - Daily Driver Status

    24. Member mk3alltheway's Avatar
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      02-25-2012 01:17 PM #25
      Quote Originally Posted by GTIVRon View Post
      Yea. I have learned so damn much thanks to this forum, I like to help whenever possible.
      story of my life

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      02-26-2012 09:35 AM #26
      Good catch, obviously not an obvious problem. Explains why all the voltage checks were good.
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