Do 1993 205GTIs have Tachometric relay?
  • Register
  • Help
Results 1 to 16 of 16
Like Tree2Likes
  • 1 Post By Cosmo
  • 1 Post By Matthew

Thread: Do 1993 205GTIs have Tachometric relay?

  1. #1
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default Do 1993 205GTIs have Tachometric relay?

    Hey fellow froggers

    Do 1993 205GTIs have Tachometric relays & if so where are they located...

    Advertisement


    Have a wiring mess under the hood that I'm trying to tidy up - back to stock - but without it car is totally dead. (with it all connected it runs fine)...

    Its a Bosch relay connected directly to the battery & what looks like a heat exchange....mounted on the body / next to right headlight.

    Will post a pic soon.

    Cheers
    Attached Images Attached Images
    1993 205 GTI
    2009 MX5

  2. #2
    Fellow Frogger!
    Join Date
    Dec 2010
    Location
    Melbourne
    Posts
    376

    Default

    Petty sure a series 3 has tacometric control for the fuel pump is built into the ecu and uses standard relay to power fuel pump. That really in the photo isn’t a tachometric, but may well be used for the fuel pump (or lots of other things). Next to it is a ballast resistor, not sure why that would be there. Is the ignition system standard?

  3. #3
    1000+ Posts
    Join Date
    Mar 2004
    Location
    Brisbane
    Posts
    1,645

    Default

    Think not, at this stage they moved from Bosch L Jetronic (discrete parts) to Motronic the big difference was monlithic closed loop control so that infers the purpose of the tachymetric relay was subsumed by the ECU, so I believe the answer is no.
    87 S1 205 GTI / GTI6 powered a project underway
    306 convertible (gti6 candidate)
    307 HDi wagon
    407 HDi wagon

  4. #4
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    Thanks for the reply angru. The ignition system looks standard - I think, need to see another car to compare I guess.
    angru likes this.
    1993 205 GTI
    2009 MX5

  5. #5
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    Ok cool - it definitely affects start up - completely dead without it.
    1993 205 GTI
    2009 MX5

  6. #6
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    Definitely a DKZ (Nov 93) with the Motronic ECU.......and non standard looking wiring behind the alternator...
    Attached Images Attached Images
    1993 205 GTI
    2009 MX5

  7. #7
    1000+ Posts
    Join Date
    Mar 2004
    Location
    Brisbane
    Posts
    1,645

    Default

    Turns over but not firing?
    Fuel pump primes when key is turned but before starter is used.
    Pull injector rail with injectors still in it and look for fuel being sprayed, let this dry before doing anything further.
    87 S1 205 GTI / GTI6 powered a project underway
    306 convertible (gti6 candidate)
    307 HDi wagon
    407 HDi wagon

  8. #8
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    with it connected - engine turns and runs perfectly (no problem) with it unconnected - nothing - complete silence...
    1993 205 GTI
    2009 MX5

  9. #9
    1000+ Posts
    Join Date
    Mar 2004
    Location
    Brisbane
    Posts
    1,645

    Default

    Probably a relay on starter to relieve stress on key and barrel.
    angru likes this.
    87 S1 205 GTI / GTI6 powered a project underway
    306 convertible (gti6 candidate)
    307 HDi wagon
    407 HDi wagon

  10. #10
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    Very interesting thanks!
    1993 205 GTI
    2009 MX5

  11. #11
    Fellow Frogger!
    Join Date
    Dec 2010
    Location
    Melbourne
    Posts
    376

    Default

    I’m interested to know why the resistor is there. It’s hard to see from the picture but it looks like the coil of the relay has one side connected to ground and the other connected to the resistor.. I can’t imagine why anybody would do that. But from what you’ve said it’s very likely that relay is there to operate the starter motor.

  12. #12
    Fellow Frogger!
    Join Date
    Dec 2010
    Location
    Melbourne
    Posts
    376

    Default

    Iím interested to know why the resistor is there. Itís hard to see from the picture but it looks like the coil of the relay has one side connected to ground and the other connected to the resistor.. I canít imagine why anybody would do that. But from what youíve said itís very likely that relay is there to operate the starter motor.

  13. #13
    1000+ Posts schlitzaugen's Avatar
    Join Date
    Nov 2010
    Location
    loneliness capital of the world
    Posts
    8,775

    Default

    Yep. That was my guess when I saw the picture. Relay to control starter.

    If you want to know what to look for look up on the web what the tachymetric relay looks like. Without too much detail, it should have more than 4 pins (from memory seven). On my 1987 205 GTI, it was housed in the black plastic box with a whole bunch of wires just under the AFM. It's a Bosch relay, can't remember the part number.

    This is what it looks like:

    http://www.aussiefrogs.com/forum/att...chy-relay2.jpg
    ACHTUNG ALLES LOOKENPEEPERS

    Das computermachine is nicht fur gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitssparken. Ist nicht fur gewerken bei das dummkopfen. Das rubbernecken sightseeren keepen hands in das pockets-relaxen und watch das blinkenlights.

  14. #14
    1000+ Posts cam85's Avatar
    Join Date
    Nov 2003
    Location
    Bondi
    Posts
    3,300

    Default

    Quote Originally Posted by Matthew View Post
    Turns over but not firing?
    Fuel pump primes when key is turned but before starter is used.
    Pull injector rail with injectors still in it and look for fuel being sprayed, let this dry before doing anything further.

    I dont think S3 cars do this. Correct me if im wrong. I thought they primed only once the flywheel was moving?

    Early cars prime before being turned.
    98 Xantia CT
    94 205 Gti Classic #9
    92 405 Mi16
    87 205 GTi Race Car
    http://www.aussiefrogs.com/forum/res...-race-car.html

  15. #15
    1000+ Posts
    Join Date
    Mar 2004
    Location
    Brisbane
    Posts
    1,645

    Default

    Quite probable this is early motronic and makes sense, not having one makes it hard and my recent experience is all post 1998 with this now

  16. #16
    Member Cosmo's Avatar
    Join Date
    Apr 2002
    Location
    Melbourne
    Posts
    84

    Default

    Can email clearer pics to anyone who's interested....I cant seem to add anymore on this site.

    The ceramic coil bit does only loop around from relay to ground/body. One connector goes straight to the battery & two (black & red) wires connect to others under the intake - assume that's where the starter motor is.

    Might be a solution to a dodgy starter motor - providing more power &/or avoiding a meltdown...

    The relay is generic Bosch.
    1993 205 GTI
    2009 MX5

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •