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    Thread: Help! Obd1 Aba engine harness wiring diagram

    1. Member
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      11-11-2010 11:46 AM #1
      I'm swapping a obd1 aba into my 1990 jetta
      I read it's plug and play but i have extra plugs laying around so if anyone has a wiring diagram that would be great.
      Thanks
      I spooned eastcoaststeeze in dannybarones bed

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      11-11-2010 12:22 PM #2
      I suggest that you buy the Bentley Manual for the model year of the engine and wiring harness that you're trying to swap into your car. You're going to need the engine service information (ABAs are not the same as 1.8s), as well as the wring diagrams that you are asking for.

      The For Sale Section and amazon.com are both places you should be able to find MKIII Bentley VW Service Manuals for less than $40 shipped.

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      11-11-2010 04:38 PM #3
      Well I know it's completely different than a 1.8. And I've looked at one manual. Wasn't a bentley and there wasn't a diagram for a obd1 Aba. But thank you
      I spooned eastcoaststeeze in dannybarones bed

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      11-11-2010 05:14 PM #4
      That's exactly why you need a Bentley. The Bentley VW Factory Service Manual contains the wiring diagrams for the different model years (it was revised every so many years while the MKIII was in production and the wiring diagrams for newer model years were added as time went on).

      That's why I wrote to tell you to make sure that the Bentley you buy covers the model year of the engine and wiring harness you're installing.

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      11-11-2010 06:13 PM #5
      Well I was hoping to find a diagram online. Everyone says it's just plug and play but I have extra plugs laying around lol. My friend has a bentley manual or mkii mkiii and mkiv just gotta get my hands on the mkiii one
      I spooned eastcoaststeeze in dannybarones bed


    6. Member GREGGO!'s Avatar
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      11-11-2010 06:31 PM #7
      just checkin but you are using all the aba wiring right?

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      11-11-2010 06:52 PM #8
      From what I know the harness is a obd1 Aba. That's what I was told and thanks for the diagram I appreciate it. But the motor is out of a 1994 2.0 and the harness is out of a 95
      I spooned eastcoaststeeze in dannybarones bed

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      11-11-2010 07:19 PM #9
      yea the 95 harness will work on the 94 aba. their both obd1. are you finding extra connectors in the engine bay or under the dash?

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      11-11-2010 07:29 PM #10
      In the bay. I don't have the o2 sensor plugged in or
      The radiator yet. But still have more plugs.. Also need to figure out for the ground wire from the altanator to the starter and stupid stuff like that. And just need the motivation to finish it
      I spooned eastcoaststeeze in dannybarones bed

    10. Moderator the brit's Avatar
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      11-11-2010 08:35 PM #11
      Quote Originally Posted by JBr0th3rs View Post
      In the bay. I don't have the o2 sensor plugged in or
      The radiator yet. But still have more plugs.. Also need to figure out for the ground wire from the altanator to the starter and stupid stuff like that. And just need the motivation to finish it
      Woah woah woah.

      1) There is no "ground wire" from the alt->starter. It's either a little blue igniter wire from the cluster or it's a HUGE +12 *LIVE* wire from the starter, that then goes to the +ve on the battery. Do not connect this to ground. Yikes. Seriously, do not do that.

      2) There's going to be empty plugs. Are you finding them on the engine side of the harness, or the fuse panel end? Post pictures, colors, wiring sizes etc if you're worried.

      3) Motivation? It's a REALLY simple swap. Get the hell out there and get it finished. Seriously, it's a fun and easy swap. Just do it.

      4) I literally wrote the how-to on how to wire a OBD1 ABA into a mk2 by connecting only 5 wires: http://forums.vwvortex.com/showthrea...ABA-2.0-to-run

      here's the important stuff, all color coded for easy understanding:


      WIRES THAT MUST BE CONNECTED FOR THE OBD1 ABA ENGINE TO RUN:

      | WIRE COLOR | WIRE SIZE | FUNCTION | CONNECT TO WHAT? |

      | Black | Thick | Coil Output | +12 switched power |
      | Red/Yellow | Medium | ECU Memory Power (T68/54) | Permanent +12v |
      | Red/Blue | Thick | ECU Power | +12 switched power |
      | Black/Brown | Thin | ECU Power | +12 switched power |
      | Brown/White | Medium | Ground | Ground |

      | œ Orchid Euro Importation œ |

      Currently driving or working on too many cars...
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      11-11-2010 08:50 PM #12
      That's what I'm afraid of! I know it will be a blast to drive lol. And then I won't spend any quality time with my 20th=[ haha but honestly I haven't looked at the harness that much haha just plugged the simple stuff. So I'll take a look after work
      I spooned eastcoaststeeze in dannybarones bed

    12. Moderator the brit's Avatar
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      11-11-2010 08:56 PM #13
      Quote Originally Posted by JBr0th3rs View Post
      That's what I'm afraid of! I know it will be a blast to drive lol. And then I won't spend any quality time with my 20th=[ haha but honestly I haven't looked at the harness that much haha just plugged the simple stuff. So I'll take a look after work
      Once you've hooked most of the stuff onto the engine, just throw those 5 wires together and your ECU will run.

      However.. this does assume some pretty basic stuff i.e. you didn't cut out the red/black wire that goes to the starter solenoid. And you didn't connect the big red wire going to the starter to ground If you do that, it'll spark and maybe warm your garage up, but it won't help it start.
      | œ Orchid Euro Importation œ |

      Currently driving or working on too many cars...
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      | '82 Caddy 1.9D | '85 VW LT Car Transporter | Mk2 Jetta Limo | '90 Jetta 8V | '96 VW LT35D | '03 SpintLT35 | '02 GTI 337 | '03 GTI 20v |
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    13. Junior Member soaker's Avatar
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      02-11-2011 10:05 PM #14
      IS THERE AN A2RESOURCES STYLE PAGE FOR A1'S!!!!!!????????

      1) There is no "ground wire" from the alt->starter. It's either a little blue igniter wire from the cluster or it's a HUGE +12 *LIVE* wire from the starter, that then goes to the +ve on the battery. Do not connect this to ground. Yikes. Seriously, do not do that.

      2) There's going to be empty plugs. Are you finding them on the engine side of the harness, or the fuse panel end? Post pictures, colors, wiring sizes etc if you're worried.

      3) Motivation? It's a REALLY simple swap. Get the hell out there and get it finished. Seriously, it's a fun and easy swap. Just do it.

      4) I literally wrote the how-to on how to wire a OBD1 ABA into a mk2 by connecting only 5 wires: http://forums.vwvortex.com/showthrea...ABA-2.0-to-run

      here's the important stuff, all color coded for easy understanding:


      WIRES THAT MUST BE CONNECTED FOR THE OBD1 ABA ENGINE TO RUN:

      | WIRE COLOR | WIRE SIZE | FUNCTION | CONNECT TO WHAT? |

      | Black | Thick | Coil Output | +12 switched power |
      | Red/Yellow | Medium | ECU Memory Power (T68/54) | Permanent +12v |
      | Red/Blue | Thick | ECU Power | +12 switched power |
      | Black/Brown | Thin | ECU Power | +12 switched power |
      | Brown/White | Medium | Ground | Ground |

      [/QUOTE]

    14. Moderator the brit's Avatar
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      02-11-2011 10:35 PM #15
      Quote Originally Posted by soaker View Post
      IS THERE AN A2RESOURCES STYLE PAGE FOR A1'S!!!!!!????????
      This is somewhat similar, and has lots of good info. Nothing beats a Bentley Manual with the wiring diagrams though!

      http://www.mk1vw.info/modules.php?na...p=viewcat&id=4
      | œ Orchid Euro Importation œ |

      Currently driving or working on too many cars...
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      | '09 Aprilia RS125 | '81 Kawasaki AR80 | '59 NSU Quickly | '64 Honda Cub C65 + '65 C105 | Trek Madone 7.9 | Trek Crockett 9 |

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      02-12-2011 07:26 PM #16
      sorry i never posted again. but the car is running and runs great! i figured out why there was so many extra plugs... the harness the guy sold me was the actually engine harness (all the wires and plugs on the motor etc.....) bought the correct harness wired the mk2 ignition to the mk3 harness for turn key start. put 2k on her already and love it!
      I spooned eastcoaststeeze in dannybarones bed

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