Spec Miata Community   
search | help | calendar | games | forum home

  next oldest topic   next newest topic
» Hello Spec Miata Community » SpecMiata.com » Spec Miata Garage » Pinout Repair

 - Email this page to someone! | Subscribe To Topic  
Author Topic: Pinout Repair
iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

My car expereinced electrical problems off and on during the Goblins Go, and I plan to swing by and look for the culprit, this evening.

As I suspect it's loose wiring in the harness, at the ECU plug, are there any good threads/site's on pinout repair? What have you guy's done in the past?

Thanks!
hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Bob Thornton - Race Engineering Verified Driver Made Donation to Website Series Champ
When the eagles are silent, the parrots begin to jabber. - Sir Winston Churchill

Region: Central Carolina
Car #: 48
Year : 1999
Posts: 1327
Status: Offline
Icon 1 posted  Profile for Bob Thornton - Race Engineering   Author's Homepage     Edit/Delete Post  Report this post to a Moderator

Be patient, it takes a lot of time and its no fun.
you will find it just keep looking.

--------------------
Bob Thornton
http://www.raceengineering.org
Race Engineering Championship Winning Engines

Randy Thieme
Member

Region: Oregon
Car #: 51
Year : 1993
Posts: 322
Status: Offline
Icon 1 posted  Profile for Randy Thieme     Edit/Delete Post  Report this post to a Moderator

I had problems with my harness connector to the ECU earlier this year. Had unwittingly swapped in an ECU whose prongs had been twisted on purpose. Those prongs enlarged the holes in the harness connector so it no longer worked with a ECU with normal, straight pins. Friend recommended an auto-electrician who knew how to diagnose and fix the connector. (It's actually possible to disassemble the connector but I'd only recommended a professional to fix it.) Try to find an old-school technician who fixes things rather than just replacing them.

pat slattery Verified Driver Made Donation to Website
Veteran Member

Region: cincy
Car #: 79
Year : 92
Posts: 1495
Status: Offline
Icon 1 posted  Profile for pat slattery     Edit/Delete Post  Report this post to a Moderator

quote:
Originally posted by Randy Thieme:
I had problems with my harness connector to the ECU earlier this year. Had unwittingly swapped in an ECU whose prongs had been twisted on purpose. Those prongs enlarged the holes in the harness connector so it no longer worked with a ECU with normal, straight pins. Friend recommended an auto-electrician who knew how to diagnose and fix the connector. (It's actually possible to disassemble the connector but I'd only recommended a professional to fix it.) Try to find an old-school technician who fixes things rather than just replacing them.

Why would someone twist the prongs on purpose

Pat

--------------------
keeping the faith for the 1.6

Arrow Karts

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

I've never needed to look, does the ECU harness disconect from the dash and engine harness's?

It would be nice to pull it out and get it on the bench w/o unpluging every thing on the engine.

Thanks!
hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Randy Thieme
Member

Region: Oregon
Car #: 51
Year : 1993
Posts: 322
Status: Offline
Icon 1 posted  Profile for Randy Thieme     Edit/Delete Post  Report this post to a Moderator

quote:
Originally posted by pat slattery:
[QUOTE]Why would someone twist the prongs on purpose

Pat

Apparantly it's sometimes done as a fix to a loose connection. Twist the pin and it wedges in tighter. Works as long as the same ECU and harness are together but becomes a problem when swapping ECU's. Once that happens only solutions are to either twist the pins in the original ECU or fix the harness.

Willie the Tard Verified Driver
Member

Region: NASA Texas
Car #: 8
Year : 92
Posts: 697
Status: Offline
Icon 1 posted  Profile for Willie the Tard   Author's Homepage     Edit/Delete Post  Report this post to a Moderator

quote:
Originally posted by iambhooper:
I've never needed to look, does the ECU harness disconect from the dash and engine harness's?

It would be nice to pull it out and get it on the bench w/o unpluging every thing on the engine.

Thanks!
hoop

the ECU plug is part of the front harness and does not diconnect from it. it does disconnect front the dash, engine (the one from the alt to battery), FI (the one on the engine) and the rear harnesses.

--------------------
William Keeling a.k.a. Willie the Tard

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

Yep, I went to the shop and took a look at it. Apparently the repair I made to it (in order to get the car running and on the trailer to VIR for the Goblins Go) was at fault.

My soldering held up [Big Grin] , as the wire I added was still intact to both the harness and the pin. However, the pin was a bit loose in the module and therefore in ECU. [banghead] It pulled out fairly easy.

So I plan to go by Graybar and see if I can get a replacement female pinout (any better idea's?) and repair that. I'm also thinking of applying some hot glue on the back side of the module (where the wire's go in) to "hold" everything in a bit better.

hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Randy Thieme
Member

Region: Oregon
Car #: 51
Year : 1993
Posts: 322
Status: Offline
Icon 1 posted  Profile for Randy Thieme     Edit/Delete Post  Report this post to a Moderator

quote:
Originally posted by iambhooper:
So I plan to go by Graybar and see if I can get a replacement female pinout (any better idea's?) ...

hoop

PM me your street address and I'll send you one snail mail for free. Just tell me if its a large one from near the sides or a smaller one from the middle.

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

UPDATE...

FYI, GM actually has pinout's avialable that are similar enough to the larger one's. I got several of those and "fixed" the wire in need.

But it can't just be that simple, can it? [Big Grin] After repairing that wire, and applying some dialectic grease to the module, I cranked the car and checked the harness. If I moved a group of wire's the car would stall and die. I looked at the module wire by wire (zip tieing all the hvac wire's out of the way), but couldn't find anything that stuck out as a problem.

So, I cranked the car again and tried to repeat the process.... damn if the car wouldn't stall! At this point, I'm flabergasted... maybe it's time to pull the harness out of the parts car and replace this one?!

hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Sacslider
Uber time waster

Region: SFRegion
Car #: #27
Posts: 283
Status: Offline
Icon 1 posted  Profile for Sacslider   Author's Homepage     Edit/Delete Post  Report this post to a Moderator

I have had to replace two entire harnesses in two different cars when the problems could not be readily identified. Both had intermitant problems that could not be duplicated consistantly. Replacing the harnesses fixed both. Seems that the 20ish year old wiring in the 1.6's is slowly starting to decay and cause issues. Not good since the are a bitch to change.

--------------------
Craig Evans
#27 Spec Miata
San Francisco Region
Life, Liberty, and pursuit of another checkered flag.
SpecMiataSuperstore.com

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

yeah I'm not looking forward to that, especially now that it's starting to get cold (part's car is outside), and subbing one 20 yo harness for another.

but, i'm not paying $1500 for a new one!

hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

Update... I made a decision to not remove 2 harness's (one each from part's car and race car) and install one. I just felt that would take the better part of an entire weekend.

I decided to cut the harness's and solder in the ECU plug's out of the part's car (the wiring and plug's appear to be in much better condition). Which bring's me to a question... In IT ECU's are open and I can relocate them, can I add wire to the harness to allow the ECU to move (if I need to swap it)?

Also, and I will do a search on this, what are the diffence's in the ECU's? 2383, 2384, 2385? Any? I seem to have several extra's.

Thanks!
hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

iambhooper
Member

Region: NCR
Car #: NA
SMIM: NA
Posts: 125
Status: Offline
Icon 1 posted  Profile for iambhooper     Edit/Delete Post  Report this post to a Moderator

Question... on ECU connector #2, there's a couple of wires that "merge" into a grey/red shieldedand orange shielded wire.

I can't seem to figure out where the sheilded wire's go to. Also, as I am soldering the new connector into the harness, is there anything special I should do with the shielded wire's?

Thanks!
hoop

--------------------
hoop
'91 Spec Miata
'90 NA Beater/Track Day car
'06 RSX Type S

Kent Carter Verified Driver Made Donation to Website
Future Never Has Been

Region: Houston
Car #: 91
Year : 1991
Posts: 2171
Status: Offline
Icon 1 posted  Profile for Kent Carter   Author's Homepage     Edit/Delete Post  Report this post to a Moderator

quote:
Originally posted by iambhooper:
Question... on ECU connector #2, there's a couple of wires that "merge" into a grey/red shieldedand orange shielded wire.

I can't seem to figure out where the sheilded wire's go to. Also, as I am soldering the new connector into the harness, is there anything special I should do with the shielded wire's?

Thanks!
hoop

I'm pretty certain that the shields are tied together, but 'float' on the ECU side. By 'float' I mean that they do not touch metal at all on the ECU side, but are grounded on the other side (O2 and CAS). This prevents a ground loop from being formed.

--------------------
Do I turn my 99 Hard S into a killerfast SM or seek a donor?

   

   Close Topic   Feature Topic   Move Topic   Delete Topic next oldest topic   next newest topic
 - Printer-friendly view of this topic | Subscribe To Topic
Hop To: