FORScan PCM reprogramming (as-built) RX-8 (+other Mazdas...)

[Ilkohristov72]

Ich habe Mazda2 1.6 95hp diesel 2012 und ich brauche CC actiewiren Vin Numm ist JMZDEA46200453465
Können Sie mir helfen.
MfG
Ilko

[mercuris]

hi anyone successfully disable or masked the rx8 secondary air pump fault code? P0410

[JamieM]

It's not something that can be done with as-built data. Masking out fault codes requires normal "mapping" with the likes of MazdaEdit, etc (i.e. writing to what people call the "ROM" (flash), rather than the as-built data which is stored in a different part of the chip memory).

[Houillon]

Bonjour, quelqu'un a trouver une idée pour masquer/ inhiber /reprogrammer/ changer les valeurs ? pour ne plus avoir le voyant obd qui s'allume à cause du code défaut P0410 sur rx8 ?

[Paul_13]

It's not something that can be done with as-built data. Masking out fault codes requires normal "mapping" with the likes of MazdaEdit, etc (i.e. writing to what people call the "ROM" (flash), rather than the as-built data which is stored in a different part of the chip memory).

I've actually been wondering this myself.
Surely there must be a byte you can modify on the asbuilt data to switch off the whole secondary air system. It works with activating/deactivating the cruise control so surely there must be something hidden.

[Ciprian24fit]

Hi JamieM,

Short question, maybe you can help me . I have a Mazda3 BK 1.6D from 2008 and i'm trying to activate the CC. I have taken the buttons from a Mazda6 and reconfigured the pins (all CC commands work, so this makes me think i placed everything correctly).

I also have changed the bits for CC as follows:

;Block 1
7E0G1G1 4A4D5A424B67
7E0G1G2 313459323812
7E0G1G3 3136373230EB
7E0G1G4 3534FFFFFF52
7E0G1G5 FF2AFFFFFF13
7E0G1G6 FF033D0DA4DE
7E0G1G7 FFFF 9641 FFC3 -> Here i made the following change: FFFE 9641 FFC2
7E0G1G8 FFFFFFFFFFEB
7E0G1G9 FFFFFFFFFFEC
7E0G1GA FFFFFFFFFFF3
7E0G1GB FFFFFFFFFFF4
7E0G1GC FFFFFFFFFFF5
7E0G1GD FFFFFFFFFFF6
7E0G1GE FFFFFFFFFFF7
7E0G1GF FFFFFFFFFFF8
7E0G1H0 0000FFFFFFFB
7E0G1H1 FFFFFFFFFFFA
7E0G1H2 FFFFFFFFFFFB
7E0G1H3 FFFFFFFFFFFC
7E0G1H4 FFFFFFFFFF03
7E0G1H5 FFFFFFFFFF04
7E0G1H6 FFFFFFFFFF05
7E0G1H7 FFFFFFFFFF06
7E0G1H8 FFFFFFFFFF07
7E0G1H9 FFFFFFFF363F
7E0G1HAC7FF3004

This change activated the CC and everything worked properly but 2 new errors started appearing:

Code: P1187 - Variant Selection and P1639 - PCM Vehicle Identification Block Corrupted or Not Programmed.

Could it be that i'm missing anothe bit that i have to change ?
P.S. PCM was changed with FORScan program, but the thing is that after i change the value and hit "write" the program stays in "Executing service procedure..." which makes me think the actual issue is caused by the fact it's not writing everything completly.

I tried using the program delevolped by you, but i'm using a ELM327 with wifi, but i can't manage to find the port in order to connect to it via cmd.

Thanks

[JamieM]

Yeah, there's another checksum right at the end of the data, which it sounds like FORScan is not updating for you. See here: http://forscan.org/forum/viewtopic.php? ... =10#p16553

The above is for RX-8's, and your data is a different length (which means non of my programs will work, since they are hard-coded for RX-8 data lengths). However, the format looks to be very similar, just a bit longer, so you might be able to make it work through FORScan if you manually correct the checksum yourself.

Assuming the checksum is in the same place as the RX-8 data, then your checksum is probably the 0x36C7 right at the end here:

7E0G1H8 FFFFFFFFFF07
7E0G1H9 FFFFFFFF363F
7E0G1HA C7FF3004

Note that the grey bytes aren't sent to the car, nor included in the checksum. They are only used to verify data entry in FORScan/IDS.

Since we "took away" one bit to enable CC, we need to "add 1" back to this checksum (i.e. make it 0x36C8) to make the whole overall sum still 0, so we pass the validity/corruption check. I haven't checked the maths in full but I suspect if you change the last line to this:

7E0G1HA C8FF3005

Then it may work. Or at least get rid of one of the error codes (probably the one about corruption). Not sure about the other one!

[Ciprian24fit]

Hi JamieM,

Yes indeed, changing the C7 to C8 made everything better and no more errors. I did this 2 days ago and been testing everything.

What i forgot to change was the 04 to 05 at the end but will do it today.

Thanks for your help.

[james1202]

Hi JamieM,
My car is a 2005 JDM RX-8 6-port 6MT. Currently, the cruise control function is not activated. I have purchased FORScan and can read the PCM data as shown below.

I would like to ask which values/bytes I need to modify to enable the cruise control function. Thank you very much in advance.

7E0-01-01：5345 3350 3135
7E0-01-02：3434 3133 30E6
7E0-01-03：2020 2020 208B
7E0-01-04：2020 FFFF FF29
7E0-01-05：FF2A FFFF FF13
7E0-01-06：FF03 0DFF FFFB
7E0-01-07：FFFE FFFF FFE9
7E0-01-08：FFFF FFFF FFEB
7E0-01-09：FFFF FFFF FFEC
7E0-01-10：FFFF FFFF FFF3
7E0-01-11：FFFF FFFF FFF4
7E0-01-12：FFFF FFFF FFF5
7E0-01-13：FFFF FFFF FFF6
7E0-01-14：FFFF FFFF FFF7
7E0-01-15：FFFF FFFF FFF8
7E0-01-16：FFFF FFFF FFF9
7E0-01-17：FFFF FFFF FFFA
7E0-01-18：FFFF FFFF FFFB
7E0-01-19：FFFF FFFF FFFC
7E0-01-20：FFFF FFFF FF03
7E0-01-21：FFFF FFFF FF04
7E0-01-22：FFFF FFFF FF05
7E0-01-23：FFFF FFFF FF06
7E0-01-24：FFFF FFFF FF07
7E0-01-25：FFFF FFFF 5E67
7E0-01-26：44FF 3081
7E0-02-01：3133 4896
7E0-03-01：422D
7E0-04-01：3041 5D
7E0-05-01：301D