I have recently completed a successful auto-to-manual swap in my 1991 NA GXL. But after I did the swap, my cruise contol no longer works. I was wondering if anyone out there was able to get their cruise contol working after a tranny swap on an S5?? I am assuming there is some tricky re-wiring that needs done, but I am not sure what. Any help, advice or guidelines would be appreciated.
Thanks

 

Did you disconnect your 4At Control Unit???

Looking at the fsm it seems there is a jumper wire that needs to be removed from around the clutch switch. The color isn't given in the picture.

Make sure the 4AT is disconnected first. I can't quite figure out that jumper wire around the clutch sw for an automatic. I'd snip it if I knew the color and I bet the cruise would work.

See the fsm.

 

what do you mean by the 4AT Control Unit??
and you think a wire near the clutch switch at the actual clutch pedal needs to be snipped???

 

Is there even anyone out there who ever got their cruise control to work after and auto-to-manual swap??

 

On the series four the automatic transmission computer is called the 4AT UNIT. It interfaces with the Cruise Control Unit.

Tell you what, with the automatic trans computer disconnected, also disconnect the brake and clutch switches. Go for a ride on a unpopulated road and engage the cruise control with a eye to turning it off in an emergency using the button on the control switch.

IF the cruise control now works, try reconnecting just the brake switch and going for a ride to see if it engages again. If it does, use the brake switch to disengage it. Write back the results. I'll post a diagram of a SERIES FOUR cruise control unit and the wire I referred to in the first post.

 

But, you see....I have a series 5. Which means I have a lot more electronics than the s4. The auto-transmission computer in a S5 is known as the E-CAT. Is this the same as the 4AT UNIT?

 

I'd try removing anything that relates to the automatic car and make it ape a non automatic car. See the jpgs and the red lines that indicate AUTO

 

Where it says SHORT FOR AT.....I think that must have just been a jumper wire in the clutch switch plug seeing as how a auto does not have a clutch. The plug was there without the switch, so they put a jumper wire in the plug on a auto. Sooooo, if you installed a manual with clutch switch/pedal you must have removed that jumper wire in order to connect the clutch switch up. That's what I figure.

If the jumper is there it should be disabling the cruise function. Much like stepping on the clutch pedal on a manual car should. Remove jumper wire is my solution.

 

But that is for a s4, I have and s5!?!?!?!

 

Get a series five schematic. I very much doubt that Mazda changed they're way of doing cruise control. I agree the wire colors will be different but the principal the same. Prove me wrong. I've been wrong before. I do agree you can't work off that schematic. I was just trying to give you a possible clue.

If I had a series five schematic I would post the picture. I don't.

Someone with this conversion can feel free to pipe in just any time you want. We're waiting on you.

 

http://www.teamfc3s.org/main/factory...cal_System.pdf

this website is the fsm for the s5
page number 70 has the schematic

 

I believe what happened was they used the 5SP wiring for the main dash harness, which had the brake/clutch switch wires already in it, and since the AT didn't have it, I think they jumpered it together, so the cruise thought the clutch was always up, thus always engaged, except for brake interrupt.

 

Yes, I was just about to give you some jpgs.

 

but see, here is the thing I don't understand. If what you say is true. Then the cruise control should still work in my now manual rx7 because the clutch switch is jumpered, thus the same as if the pedal is not depressed. The only thing that snipping that jumper wire does is allow the action of depressing the clutch pedal to interupt the cruise.

 

What happens if you disconnect the clutch switch and try engaging the cruise. Not theory but actual application of removing the plug from the switch?

 

https://www.rx7club.com/attachment.p...hmentid=124508

SonicRat, I don't understand the jumper wire on the series four. Inside the Cruise Unit you have a OR gate. It has three possible inputs. Clutch, brake pedal and a circuit from the brake circuit. IF you depress the clutch pedal or the brake pedal you send12v to the OR gate. Any three of those will turn the Cruise off.

IF a jumper is there, as shown in the picture, I would think the cruise would never engage.

What do you'all think about them apples?https://www.rx7club.com/attachment.p...hmentid=124508

There also seems to be an inverter going to that OR gate from the STARTER circuit and 4AT circuit.

 

What you said makes complete sense. I am a mechanical engineer, and I hate electronics.

However, it seems as though there would still be more tricky wiring needed to get the cruise to work properly, and I can't figure it out!!!

 

Did you ever disconnect the computer that is dedicated to the automatic transmission? Called 4AT on a series four.

And also try what I suggested earlier....removing the plug from the clutch switch (lower clutch pedal switch)?

If it were my car I'd get a meter out and pull the plug off the cruise unit and take a look at Pins M, H and J with the key to ON. There shouldn't be any voltage there at all unless the pedals are depressed.

Pin G comes from the EC-AT and I'd just depin that little dude.

We assume you have a good fuse and the light on the cruise switch has been lighting up.

The combination meter didn't get changed when you did your auto/manual swap, did it?

 

I have disconnected the E-CAT

I looks like the cruise control unit needs and input from the A/T though, so I might just hard wire 12 volts for that input

Also, on my dash, the P N R D 2 L lights, the D light lights up in 1-4th gear, but in 5th gear doesn't light up. I figure this could be a problem seeing as how the cruise control unit requires the car to be in drive

 

I'm thinking the cruise control unit is used on both auto and manual cars and there is not a seperate one for each. So if the specific auto signals are removed then it thinks its a manual car???Yes. I'm for removing all A/T signals myself.

Memory also tells me I had a cruise problem. It would not engage. The brake switch or the clutch switch failed. It failed not internally but it failed mechanically. If memory serves it had a plunger and that plunger was extended all the time even when the given pedal was all the way up. I forget the specifics, but it was the plunger always being extended putting 12v on the cruise control and causing the disengage of the cruise. I still recommend pulling the plugs on the clutch and brake pedal and going for a drive. Use some caution.

 

Thanks for the help
I will take a look at it tonight and try some of the various things that you said