On the way to work this morning, the "HOLD" light started flashing on the dash of my car.
I was trying to remember some of the earlier responses to what the problem might be, but can't, and I don't have my service manual in the car.
Anyone......what is the problem?

Thanks.

 

You can find a copy of the manual here

http://www.rx7s.com


Start looking at the AT section page K-214. You have to jumper some pins in the diagnostic connector and then the codes will flash on the hold light.

Good Luck

 

It's actually a known problem that Mazda released a TSB for:

14. HOLD INDICATOR LIGHT FLASHES
Service bulletin #012/92, Category K, issued 7/15/92
Applies to 1993 RX-7 built prior to May 11, 1992

If the hold light starts flashing while the vehicle is
running, and torque reduction control fail code is 57, replace ECU
under warranty.
New part# N3A2 18 9E1B
Old part# N3A2 18 9E1

Good luck getting them to pay for it though. I've had it happen and a quick KOKO fixed it.

 

as the "check engine light" is to your engine, the "hold" light is to your transmission. There was a malfunction somewhere in one of your tranny components. Most of these appear to be related to sensors for the tranny's ECU. Just like the "check engine light" it can often be cleared by KOKO. Mine has flashed once. The dealer has a tool that can read the error code. Not sure if it is as simple as shorting connectors to read flashes like with the "check engine light."

 

Hey Spigot,

I tried to get a PFC installed at RP in Garland. Chris hooked one up, but said it doesn't function properly and wouldn't work right. Have you figured out a way for the tranny's ecu to get the signals it needs? Right now as an alternative, Chris is going to try to remap the factory ECU.

 

I have the pfc in my auto fd any I don't have any problems with it, just lose the hold button.

 

As zayrx7 said, it'll work, you just lose hold. I've been really busy and havn't had a chance to play with my controler design for the last few months. I'm in the process of finding a new place to live at the moment, but when that is done, and my life is back to normal I might have some time to play again. I'll probably try and get my level10 box working and then mimic the behavior using the standard shift lever instead of the button box they use.

Matt

 

Thanks guys....the KOKO procedure eliminated the flashing.

 

I don't think that's exactly right. There are sensors from the stock ECU that you lose, like the speed sensor, throttle position sensor, engine rpm etc. Without these, the tranny has no idea what the car is doing. What are your shifts like? Does the kickdown and everything else seem normal? I guess the transmission operates in some sort of "limp home" mode since it's not receiving signals. At any rate, it can't be the best for performance or reliability, which is why I wanted an ecu in the first place.

BTW according to the shop manual K-214 short TAT and GND to read trouble codes.

 

Ok, I'll bite.......what is KOKO?

 

That's the ultra techical term for Key On, Key Off. It does a "soft reset" of the ECU.

 

Thanks jr......mine flashes when it reaches 25 mph when I first drive it. It goes off after driving a while and coming to a complete stop (I guess the torque converter or trans. fluid has to reach a certain temp?). It's been doing for a year and a half now, so I have learned to ignore it. I do know that my "Hold" function doesnt work while the light is flashing.
Allen

 

which one in the diagnosis connector is the TAT and which one is the GRN...

 

wow, zombie thread back from the dead! the connector is the main diagnostic connector under the hood, near the front on the drivers side I believe. Same one you use for check engine light. look on the lid, there should be a label there.

 

So has anyone had success with installing a PFC with their a/t FD. I am having this problem right now. I dont want to lose the hold button, because that is how i keep up with m/t autos.

Landon

 

yes, but you will lose the hold feature unless you also buy a PTC TCU at www.transmissioncontroller.com.