'90 diag port
02-07-2010, 10:10 PM
#1
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Thread Starter
'90 diag port
Do all '90 MY cars have the 19 pin diag port? If so where is it.............pic would be great 
I've searched around the brains and its not as evident as the 12pin port on my '88.
TIA
I've searched around the brains and its not as evident as the 12pin port on my '88.
TIA
02-07-2010, 10:16 PM
#2
Chronic Tool Dropper
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Right side of the pass seat, under the cover where the fan brain and the audio amp live.
02-07-2010, 10:22 PM
#3
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Thread Starter
Man...............I gotta back out and check that dr. B................its kinda cold though (-15c) but I have to satisfy my curiosity.......thx
02-07-2010, 10:28 PM
#4
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02-07-2010, 10:28 PM
#5
Chronic Tool Dropper
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Trust me.
No need to chill your toes.
It's there.
No need to chill your toes.
It's there.
02-07-2010, 11:29 PM
#6
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Thread Starter
Couldn't stop myself when I walked the dogs:
'90 GT
'88 S4
'90 GT
'88 S4
Last edited by the flyin' scotsman; 02-07-2010 at 11:35 PM. Reason: adding pic
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02-08-2010, 01:48 AM
#8
Chronic Tool Dropper
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Oh Ye of Little Faith...
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The transformer is most likely a choke on the power lead feeding the audio amp, to help cut down on alternator whine.
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The transformer is most likely a choke on the power lead feeding the audio amp, to help cut down on alternator whine.
02-08-2010, 09:36 PM
#9
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Thread Starter
The choke probably serviced the OEM pwr amp which 'was' under the pass. seat but now in the 'used parts' bin.
For those following along the 19 pin diag. port is for the '89 MYs and up. The '87 and '88 MYs have a 12 pin diag port thats on the OEM ECU frame (dont have a pic but its in the '87 spec book).
To complicate matters further the early '87 models may not have the diagnostic s/w programmed in the ECU eproms. This is resolved by replacing the eproms that contained accessible software.
02-09-2010, 03:16 AM
#12
Racer
Hi Malcolm,
this might help you locate the 12pin diag port on the 1988 S4.
http://jenniskens.livedsl.nl/Technic...4/MyTip421.htm
The transformer is a noise suppressor, one side is to 12v, one is gnd and one side is power to the booster. It reduces negative voltage spikes via a diode to gnd, and a coil suppresses noise on top of the the 12v.
Good luck with the two cars !
Regards
this might help you locate the 12pin diag port on the 1988 S4.
http://jenniskens.livedsl.nl/Technic...4/MyTip421.htm
The transformer is a noise suppressor, one side is to 12v, one is gnd and one side is power to the booster. It reduces negative voltage spikes via a diode to gnd, and a coil suppresses noise on top of the the 12v.
Good luck with the two cars !
Regards
02-09-2010, 04:53 AM
#13
Drifting
New avatar Malcolm? Mr Young will be upset to be dropped!
A geeky point but I really like the 19-pin connector compared with the rectangular 12-pin. Looks just like something from a military jet.
A geeky point but I really like the 19-pin connector compared with the rectangular 12-pin. Looks just like something from a military jet.
02-09-2010, 12:01 PM
#14
Rennlist Member
Thread Starter
this might help you locate the 12pin diag port on the 1988 S4.
http://jenniskens.livedsl.nl/Technic...4/MyTip421.htm
The transformer is a noise suppressor, one side is to 12v, one is gnd and one side is power to the booster. It reduces negative voltage spikes via a diode to gnd, and a coil suppresses noise on top of the the 12v.
http://jenniskens.livedsl.nl/Technic...4/MyTip421.htm
The transformer is a noise suppressor, one side is to 12v, one is gnd and one side is power to the booster. It reduces negative voltage spikes via a diode to gnd, and a coil suppresses noise on top of the the 12v.
I concur re. your points on the connectors.............wonder how many 'regular' cars had diag ports back then?.
