North American Turbocoupe Organization



removing ABS & PRC wiring
RK87TC Offline
Member
#1
Did a search and didn't come up with anything specific on this. I want to get rid of all this extra wiring that I'm not using so that it simplifies the wiring I have to look at for future fixes and take out that extra little bit of weight.
I know there are several guys who have done this and I wanted to know what if there are any wires within either system that have to have something done to them so the car will still work. Like splicing back in somewhere or something like that.
I got the amp and its harness pulled out but that had it's own connector and just came out in one piece from the dash back.
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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RK87TC Offline
Member
#2
Ok, so today I got both ABS and PRC computers out and pulled the harness up to the firewall.
The next step is to actually cut some wires in the engine bay-that's where I'm losing my nerve.

the two relays under the vacuum tree do they need to stay for the rest of the system to work. One is abs motor relay and other is main power relay.

Would really really like some help with this. I think it'd be a good one to in the tech articles also...I'll write it if I get some help to do it!!!
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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Sluggo Offline
Posting Freak
#3
I have wiring diagrams for both systems. If that will help you, get me your email and I'll send them to you. I've been meaning to do something similar but haven't gotten around to it yet.
Doug  
88 TC / T5,4.56,Log,SC60,NPR,2277,MegaSquirt
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RK87TC Offline
Member
#4
Thanks Doug, not sure those are gonna do me any good. I have an EVTM and I have the wires all separated out I just want to make sure of what I can cut.

The part that looks like the most dangerous is the two relays and the big O/Y wire.
And then there is the GY/R one.

Also there is a gray 4 prong round plug on the drivers side that comes out of the firewall, on the engine side of the harness there is a diode there. Would like to know what would happen if I just unplugged that one.
I have all the PRC plugs and ABS plugs pulled out through the firewall, I'll have pretty much a good PRC/ABS harness and computers when done.
There is a connector right at EEC in the kickpanel and that is where the test wires go to.

They other tough part is what I can cut out of the fusible links. Of the few wires I have left several run into the fusible link with all the gray wires in it.

I think if I knew all the terminology in the EVTM I'd have better luck.
Also in the shop manual I have the have numbers for the harness parts but no where do the give a key to the numbers.

From what I've gotten so far, it really shouldn't be that tough to do, there are only a few things a guy has to be careful of. I started this on one other car by cutting out wires...immediate no start situation...that car may never run...lol
My email is [email protected]
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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Pete D Offline
Administrator
#5
One of those two relays under the vacuum tree is for the booster pump for the brakes. The other one powers the ABS system.
Pete Dunham


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RK87TC Offline
Member
#6
so I could take both of those out of the system then Pete?....thanks for the help there #4... Smile ....any other bits for me?
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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darkthunder Offline
Senior Member
#7
I removed all the ABS/PRC wiring and components from my 88TC. It was around 40lbs for the computers, wiring, sensors, and the ABS unit itself... which was about half of the removed weight.

Seems like your almost done. Just follow the wires.
darkthunder - 85 TC// 302/C4
2009 Subaru WRX//daily driver
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RK87TC Offline
Member
#8
Ok, Cool.so darkthunder, did you take out those two relays? and unplug the gray 4prong plug also?
Where there any wires you had to make into grounds or splice back together so it would run?

I actually am very close to done, am just down to the last part of actually having to cut some of the wires.
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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RK87TC Offline
Member
#9
So have been going over wiring diagrams 'till I'm about nuts but I did slowly get some things figured out.


The PRC & EEC are linked through O/W wire pin #28 on the PRC and pin #35 on EEC. Since this is a direct link between the two and the car still runs without the PRC computer I'd guess this wire is ok to cut.

Also C299, its the gray 4pin plug by the wiper motor-it looks like the only wire there that needs to be saved is the GY/Y wire as it runs back over to EEC I believe.

If someone who's a wiring whiz could just verify the above for me it'd help a whole bunch. If those are actually true, then this is probably not nearly so painful and risky of a job.

And guys the amount of wiring this takes out of the engine bay really cleans it up.
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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RK87TC Offline
Member
#10
This is a good one to put over in the electrical place huh Pete?
87 TC MM k-member package, EVM 3link/watts, Ess. d-port, 2277 solid cam, T3/04E 63 stg3/60, Spec III clutch, alum. flywheel, Stinger header-3" exhaust-FMIC-SDS-gillis valve, Cobra 17" polished wheels, moon roof, 5spd, K&N cone, 110 alt., 93 cobra MC/Booster, Steeda shifter.
Ralph
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