Jst4fun

iTrader: (2)

Spoke with the parts manager at Malloy Mazda several times today. Ray is pretty knowledgeable and if he didn't know an answer, he would ask his best tech.

Said the engine wiring harness in the 04 and 07 were the same.
The PCM in the 07 has an updated map for the MAF and the injector pulse rate.
On the 04's, the important factor for me would be the first four digits on the PCM, this
indicates the build lot, I think he said. The letter on the end on part number only indicates an updated flash.

With that being said, would be great if I could get a specific 06 or 07 PCM.
If not, looks like (as confirmed by dannobre) an 04 will work just fine. They certainly are more readily available and common due to higher production numbers.

Hopefully I will have one ordered tomorrow and be in the right direction.
Stay tuned....

As always, thanks for your input and help, its truly appreciated.

Regards,

Nick

teknics

you can compare the pinouts from the FSM's of 04's and '07's if you want to be positive, for some reason i think they upgraded some internal maps and stuff, but nothing that should effect you.

Dealer will only need your as-built data. You should be able to use this:

enter your cars vin and then print out the resulting page.

bring that to the dealer when they program it.

If that link doesnt work or asks you to login, let me know the vin and I'll do it on my account.

kevin.

Jst4fun

iTrader: (2)

Thanks Kevin!!!

Worked, I have the as-build data.

So which PCM would you recommend? The 04 or 07?

I found a PCM today out of a 07 with the exact part number and rev. my o7 engine originally had.

The only concern I have is that the 07's didn't have keys; they had cards unlike the 04 chassis the engine is in now.
Will that matter?

Thanks again! You guys have been a great help!

Regards,

Nick

G3tR3DDY2GR3DDY

iTrader: (8)

so you dont need mine?

teknics

all the rx8's have keys, its the "lower" option, the cards are "Advanced Keyless" option.

i honestly didnt look into it as far as which pcm would be best, id follow these guys suggestions on that, when i replace PCM's i order them by VIN

kevin.

Jst4fun

iTrader: (2)

Thanks Patrick, but i don't believe the number on your ECU will work
with my application.

Thanks again!

dannobre

iTrader: (3)

You need the ECU to be compatible with the Dash and other CAN Modules.....which one do you think it would be This is getting quite funny for such a simple problem

Jst4fun

iTrader: (2)

Finally! Ordered a 04 ECU today with the matching ignition, key, and security module. Should be at my place around Wed. next week. I cant wait, will post reults when complete.

Thanks again to everyone for your comments and direction!

Regards,

Nick

Jst4fun

iTrader: (2)

SOB! Still dead!
Had a two week delay with work stuff and delivery delays, but was at it today.

Installed PCM and matching ignition/key.
When the key is turned, NOTHING.
Just the alarm light flashing at a fast rate.
Am I missing something here? Should't the code that is embeded in the key that was originally with the PCM work?
I have to be overlooking something.
Any suggestions? Maybe I'll have an idea after sleeping on it...

Regards,
Nick

teknics

I think the code memory is stored somewhere else, either way you just need the keys programmed now, remember to have 2.

edit: sent you back a PM, here's an image of the module location as requested (attached image). Looks to be right near the pedals maybe, the picture is sorta bleh.
edit2: now attached a pic of the code 15 which I'm going to guess is stored (B1601/P1260) which essentially means memory doesn't match key. Based on "possible causes" only listing the keyless module and not the PCM i'm assuming the memory is in fact in the keyless module.

kevin.

Jst4fun

iTrader: (2)

As always thank you Kevin!

I do have the keyless control module that came with the PCM and ignition. Will swap it out and see what happens. Easy enough to try.

Thanks again

Nick

Jst4fun

iTrader: (2)

Well interesting results.

Swapped out the keyless module (it is actually located on the passenger side, go figure) with the one that came with the PCM and now the engine cranks!

Yes, finally something!
Unfortunatly it doesn't fire (start). Getting fuel but no spark, looking like something with the PCM. Have a few things still need to try but looking like it might need to go to dealer to get reflashed...grrr

Thanks!
Almost there, cant wait to drive it!

ASH8

Hi, Stating the obvious here, but is your Crank (Eccentric Shaft) Sensor Plugged in, this would prevent Fuel and Spark.

Jst4fun

iTrader: (2)

Hi ASH8,

That was my next step. Thanks! It is always good to be reminded of the obvious for the occasional brain fart

I would be so happy if I forgot to plug that in!
Keeping my fingers crossed...

Regards,

Nick

Delmeister

That thing cuts off both gas and spark. You said you had gas. Sorry.

Jst4fun

iTrader: (2)

No problem. Gonna check it anyway, just in case.

Busy today so didn't get to it, but tommorrow should be the day.
Unfortunatly, think a trip to the dealer is in order.

We shall see...

Jst4fun

iTrader: (2)

Yes! Finally!
It’s ALIVE!!!

After a major setback that had to be resolved, got it running!
Was good to hear it run.
Unfortunately, it idles at 2200rpm and might rev to 3100rpm if lucky. Also throwing a TPS fault code and EPS (electronic power steering) not communicating.

Oh well, was trying to avoid dealer, but I have exhausted all other options. The PCM needs to be reflashed with the as build data. Feel confident that will resolve idle, CEL and EPS.

Thanks for everyone’s help! Much appreciated
Will post a pic when complete.

Regards,

Nick

04RX8man

^mazda techs make me worry too..u start to get used to it

Jst4fun

iTrader: (2)

^
Dealer finally dumped the as build data on the PCM, no change.

They did get the power steering fixed, whoopeee...

Truthfully, they didn't tell me anything I didn't know. Said it is throwing a TPS code and the DSC light is on. They dont know why....said it must be the PCM cause it is not the original. Grrrrr

When we had it at my buddies garage, we read the same TPS code, would reset it with a Snap on reader and it would show back up instantly.
So whatever it is, it is always causing the failure.

Any input or suggestions???

Im starting to get disgusted....

ASH8

Sorry to hear this, I can't recall ALL your details, I know Mazda puts an ID or Part ID of the Part Number on their electric or electronic parts like the PCM...usually the 4 alpha/numerical model code, being the first 4 of the part #.

Did you get your dealer to confirm from the vehicles VIN the JM1FE1031..... chassis number which PCM your car should be using, from a Mazda Spare Parts point of view this should tell you everything and eliminate any error that you have the correct PCM for your car..


S1 ECU PN are all updated here..
https://www.rx8club.com/series-i-tec...stings-259366/

dannobre

iTrader: (3)

We seem to be fighting similar gremlins...something has mine doing the throttle limp mode thing too. I can reset it..and it works for 6-8 seconds..and then it throws a solid CEL and the throttle stops working

I think it might be MOP related...but I'm not sure..I'll let you know if I find anything


Dan

Jst4fun

iTrader: (2)

Finally!!!!!!

Idles where it is supposed to and revs like a rotary should, fast and high! LOL

Anyway the PS was a wiring error on my part, opps.
As for the TP code, think it was P2109, cb wrong, my memory...
What caused it was totally found by accident.
The throttle body butterfly(?) was stuck in position.
When the PCM sent a signal, the TB was there, just not responding.
So caused all kinds of safe guards to kick in and the dash to lite like a xmas tree.
Once loosened up, the damn thing worked great!
All lights are gone!
Everything I read had me chasing electrical signals, which were all there.
Hope this helps someone.

Regards,

Nick

Jst4fun

iTrader: (2)

Dan,

See my find above, maybe the same as yours?
Worth a try!
Good luck!