How to: 5spd conversion... wiring (reverse, ABS, clutch) info

[pmpaluda]

Since it seems like I'm the only one that's done it, don't get me wrong - others have, I know - just NO ONE during my search was able to provide exact details.

Ok, well... here goes nothin'.... my attempt at enabling the reverse lights in a "how to" thread.

I don't have a schematic book, so connections will be based from plugs and wire colors in my '87. And for ease of install... I cut the harness from the auto tranny (basically wanted to use the plugs).

In the attached pic, from left to right, you have the following:

1. 3 wire round plug, wht/blk spliced together enable the bypassing of the clutch (ie. pedal pushed in isn't required to start the car) and the blue is 1 of 2 wires needed for the reverse lights

2. 6 wire round plug, this plug actually tells the ECU which gear the car is in. If you searched for "auto cookie" you'll find some more info on what lead to the connections. Anyways, the only wire needed from this plug is the blk one (this is 2 of 2 for reverse wiring)

3. 6 wire square plug. not used for 5 spd. IIRC, it was linked to the 3 solenoids on the DS of the Auto tranny

4. 4 wire square plug, its a direct plug'n'play for car's with an ABS system.

[pmpaluda]

Now... just connect the Blue wire from item #1 above and and the blk wire from item #2 to the reverse sensor plug found on the PS side of the 5spd. tranny and your done. Working reverse light!

[joliroger4]

good info def getting saved. Do you have any info on wiring the cruise control cut switch?

[pmpaluda]

Originally posted by joliroger4
Do you have any info on wiring the cruise control cut switch?

I do (sort-of), but since I haven't verified its operation yet... I'm holding the info. Maybe once the car is back on the road... I'll do a write up on its wiring as well if it works.

HTH (the above mentioned info),
Patrick

[ma71supraturbo]

Nice write-up and pictures -- I'm putting a link to this thread in the FAQ sticky. I would be using this info, but I will be cheating by using the 5spd harness and ECU :D

[pmpaluda]

Cool... glad to help the community.

I opted for keeping the Auto harness mainly because of $$$. Its workable with trial and error. lolz

However, unless your changing the in-car harness as well... your curise won't work either (neither will your clutch safety for that matter). That wiring isn't in place for a Auto'd Supra.

The cruise needs the clutch sensor (on the peddal) to know when to stay activated... the clutch also needs the 2nd sensor if your not planning on by-passing it to start.

[Carl]

Thanks Pmpaluda its good to know where the hanging wires go
will do mine tomorrow.
Hopefuly one day you'll figure out how to make the cruse work:D

[Carl]

Dang that was my # 100, good thing it was a Thank you post

[ma71supraturbo]

Originally posted by pmpaluda
Cool... glad to help the community.

I opted for keeping the Auto harness mainly because of $$$. Its workable with trial and error. lolz

However, unless your changing the in-car harness as well... your curise won't work either (neither will your clutch safety for that matter). That wiring isn't in place for a Auto'd Supra.

The cruise needs the clutch sensor (on the peddal) to know when to stay activated... the clutch also needs the 2nd sensor if your not planning on by-passing it to start.

Yeah, thanks. I have a 5spd donor car, and my car is completely gutted so it shouldn't be a problem to remove any interior wiring harness either. I'll be sure to report which ones I've used. I do not have cruise, but I've seen too many idiots turn the ignition on (standing outside the car) with the car in gear -- so I do want the clutch start safety feature. I do plan on wiring an overide button though -- in the event the car breaks down I could use the starter to drive the car off the road (or up the trailer)

[pmpaluda]

My reverse if finally done... wired I should day. Basically, I saved ALL the wiring form the auto that was salvagable before throwing it in the dumpster.

The following is the short harness I threw together... it retains the 2 large round plugs. Enabling the reverse lights is essentually a "Y" configuration to the 2-wire plug (on left).

[supragutz]

well thats exactly one of the things I needed to know. Thank you

[fstlane88]

What kind of costs could I be looking at if I do the 5-speed swap, versus upping the auto tranny? Keep in mind, I'd be adding a clutch and most likely a pressure plate, and flywheel, or whatever else I should drop in to handle 350rwhp. Sorry for my not knowing, I've been studying the auto way too long, don't know much about upgrading the R154.

[pmpaluda]

tranny - who know's??? $100-400 depending on condition and/or "who ya' know"

NEW clutch/flywheel kit - $800+ (ex. my SPEC stg3/Al flywheel) plus $100 or so for the hardware between the flywheel and the base trann shaft)

Various parts (driveshaft, brackets, lines, pedals, etc...) - $200+

I've purchased most of the "various parts" needed mainly from a few people... what parts I could afford, what parts they had, etc... you may find it better to find a complete parts car.

Obviously my car was an auto before... I guess that my answer as to what it takes to build a auto. :)

HTH,
Patrick

[fstlane88]

So, basically, it comes out to being about the same price wise. I've got some thinking to do then, on whether I want to upgrade the auto or go 5-speed, and upgrade that. I really am liking that auto though.

[Keiko]

Doesn't an auto tranny have lower gas mileage than a manual car?

[pimptrizkit]

do you have any pictures of the actual swap?

you know droping the tranny.. hooking up the clutch peddle, mounting the clutch master cylinder.. ect...

just picked up an 88 auto.. and tring to source information before i begine. building with your eyes closed cost alot! of money :bigthumb:

[JG_XSBOOST]

Yeah, thanks. I have a 5spd donor car, and my car is completely gutted so it shouldn't be a problem to remove any interior wiring harness either. I'll be sure to report which ones I've used. I do not have cruise, but I've seen too many idiots turn the ignition on (standing outside the car) with the car in gear -- so I do want the clutch start safety feature. I do plan on wiring an overide button though -- in the event the car breaks down I could use the starter to drive the car off the road (or up the trailer)

Did you figure out which plug on the main harness is the one that goes to the clutch switch? I am putting a manual harness and ECU into my old Auto car (thats converted). I dont want to have to change out the dash harness though.

Jeff G

[harry89supra]

hey im doing the same swap but im findin my wires are different colors?? the tranny has 2 black wires. and my wire harnes isnt the same its from an auto can any one help me out

[dbarton97]

just got done with my auto to manual swap the other day and I hooked the wiring up just like you said except that I hooked my park/neutral switch up to the clutch safety switch and walla I got cruise controll and reverse lights and car don't start unless the clutch is pushed all the way in. doing the change over isn't teribly hard to do. about as hard as changing a clutch. and anyone that needs some help with their swap shoot me a pm and I'll help as much as I can.

P.S. lots of mechanical advise on how to get at certain bolts from ma71supraturbo

[toneloc]

Since it seems like I'm the only one that's done it, don't get me wrong - others have, I know - just NO ONE during my search was able to provide exact details.

Ok, well... here goes nothin'.... my attempt at enabling the reverse lights in a "how to" thread.

I don't have a schematic book, so connections will be based from plugs and wire colors in my '87. And for ease of install... I cut the harness from the auto tranny (basically wanted to use the plugs).

In the attached pic, from left to right, you have the following:

1. 3 wire round plug, wht/blk spliced together enable the bypassing of the clutch (ie. pedal pushed in isn't required to start the car) and the blue is 1 of 2 wires needed for the reverse lights

2. 6 wire round plug, this plug actually tells the ECU which gear the car is in. If you searched for "auto cookie" you'll find some more info on what lead to the connections. Anyways, the only wire needed from this plug is the blk one (this is 2 of 2 for reverse wiring)

3. 6 wire square plug. not used for 5 spd. IIRC, it was linked to the 3 solenoids on the DS of the Auto tranny

4. 4 wire square plug, its a direct plug'n'play for car's with an ABS system.


were does does #1,2 wires connect to the manual transmission like which part do they come from????

[joliroger4]

Does anyone know the best way to stop the O/D Off light from flashing? I was thinking just disconnected the ECT computer, remove the lightbulb as a last resort.

[tweak666]

Now... just connect the Blue wire from item #1 above and and the blk wire from item #2 to the reverse sensor plug found on the PS side of the 5spd. tranny and your done. Working reverse light!

just need a little clarification, when these wires get connected to the reverse sensor plug, is it black to black and blue to white? or does it not matter?

[redmaro]

I heard from a guy on a forum saying that keeping the stock automatic ECU when doing a 5 speed swap. would cause the boost to spool up slower in between shifts since the auto ecu is set up different than the 5 speed ecu. Is this true?

[Nocheez]

I heard from a guy on a forum saying that keeping the stock automatic ECU when doing a 5 speed swap. would cause the boost to spool up slower in between shifts since the auto ecu is set up different than the 5 speed ecu. Is this true?

No, not true at all.

Also, to get cruise control working:

Go to the cruise control box (located above the clutch pedal) and cut the black/white stripe wire. Wire each half to a terminal on the switch at the top of the clutch pedal. Voila, you now have cruise control that cuts out when you press the clutch pedal.

[2ndtoymk3]

thanks for the info planning to do the 5 speed swap was nervous about the park/netural safty switch

[Satan]

I would like to just wire in the clutch/neutral start to the auto dash harness as well... Just hadn't got to it yet.

[Jervis Mcstabby]

Halp, pics aren't showing anymore! I'm almost done with my swap, except for this part!


Edit add: If anyone has the pics (or has done the splice), could you tell me which one of the six pins you hook up to the reverse light? I don't have a black wire on it!

[Jervis Mcstabby]

Ok, looked through the TEWD, and it's the middle wire of the bottom row of the 6 pin circle plug.

[Bmettie]

Conversion done! Reverse,ABS and Speed Sensor done! Cruise wont work. I tried everything. YES I SEARCHED!!!!Do I need to unplug my ECT Computer to make it work or what do I have to do to make it work? Thanks for all the info

[Bmettie]

I figured it out..........

To make the cruise control work properly first you must wire your park/neutral switch wires to your clutch safety start switch. I wired mine with an external switch just in case i need to use the starter to move the car (into trailer, in-out of garage). Now your cruise will work when the clutch pedal isn't FULLY depressed. So if your "Cruise controlling" and step on the clutch pedal only HALF way the motor will rev up try to maintain speed because your not hitting the FULLY depressed switch yet. Even if you cut into the black/white wire coming out of the cruise computer and wire each half to the clutch pedal switch on top of the pedal, both clutch pedal switches need to be closed for that circuit to be complete thus leaving you with the same problem of the motor rev'ing up before the pedal is fully depressed.

To solve this problem you need to wire up the switch located at the front/top of the clutch pedal. Wiring this switch will tell the cruise control computer that the clutch is about to be depressed and it will cancel the cruise control. To do this you will need to find the cruise control computer which is located directly above the clutch pedal (How convenient). Unplug the harness and two hold downs so you can work on it.
Find the solid black wire, cut it and connect the plug side of the wire to one terminal of the switch at the top of the pedal. Now wire the other terminal of the switch to ground.

AbbraCaDabra now you cruise will cancel as soon as you lay your foot on the clutch pedal.

The only sacrifice....... the solid black wire in the cruise control circuit is for the parking brake cancel function so if your "cruise controlling" and lift on the parking brake it will not cancel, but I figured if I ever need to use the parking brake while "cruise controlling" I would have tried the foot brake and clutch pedal first which would have canceled the cruise control anyway. This is why if all you do is tap into the solid black wire and wire it to the switch and the switch to ground, the switch will back feed into the parking brake light circuit and your brake light in the dash will pop on every time you step on the clutch pedal. If you can deal with that or wire in a diode after the splice then you don't have to lose the parking brake cancel function but I am going to go without that function.

I hope this helps all of you without working cruise control after the swap. I certainly love the fact that I can have all the "Luxury" features in a fast fun car!!

[onejzmark3]

Can somebody tell me if I did something wrong because my abs light comes on than the car locks up and feels like its brake boosting....I did a auto to 5spd conversion...