How to control a water methanol injection with a RS4 551K ECU

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Topic: How to control a water methanol injection with a RS4 551K ECU (Read 28251 times)

flamy

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	Re: How to control a water methanol injection with a RS4 551K ECU « Reply #45 on: November 04, 2022, 12:36:20 PM »

As the ECU switches ground low level on the output pin activates the relays and high level deactivates it.


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BlackT

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	Re: How to control a water methanol injection with a RS4 551K ECU « Reply #46 on: November 04, 2022, 12:39:00 PM »

I have no problem with that, my problem is how to command ECU to that output pin. There must be something else after FDE8.0 is set to 0 or 1


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flamy

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	Re: How to control a water methanol injection with a RS4 551K ECU « Reply #47 on: November 04, 2022, 03:54:14 PM »

Change

Code:

CODE3:870A6E 3A 88 74 60                 bmovn   word_FDE8.0, USR0

Code:

bclr word_FDE8.0

and check, if level of the output pin is still high.


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BlackT

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	Re: How to control a water methanol injection with a RS4 551K ECU « Reply #48 on: November 04, 2022, 08:25:58 PM »

Nope it is still high.
I also try to change this

Code:

Seg0x21c@870000:0F08                   ; ---------------------------------------------------------------------------
Seg0x21c@870000:0F08
Seg0x21c@870000:0F08                   loc_870F08:                             ; CODE XREF: sub_870EEC+6j
Seg0x21c@870000:0F08 0F 74                             bset    word_FDE8.0
Seg0x21c@870000:0F0A 0D 06                             jmpr    cc_UC, loc_870F18
Seg0x21c@870000:0F0A
Seg0x21c@870000:0F0C                   ; ---------------------------------------------------------------------------
Seg0x21c@870000:0F0C
Seg0x21c@870000:0F0C                   loc_870F0C:                             ; CODE XREF: sub_870EEC+Aj
Seg0x21c@870000:0F0C 0E 74                             bclr    word_FDE8.0
Seg0x21c@870000:0F0E 0D 04                             jmpr    cc_UC, loc_870F18
Seg0x21c@870000:0F0E

to this

Code:

Seg0x21c@870000:0F08                   loc_870F08:                             ; CODE XREF: sub_870EEC+6j
Seg0x21c@870000:0F08 0E 74                             bclr    word_FDE8.0
Seg0x21c@870000:0F0A 0D 06                             jmpr    cc_UC, loc_870F18
Seg0x21c@870000:0F0A
Seg0x21c@870000:0F0C                   ; ---------------------------------------------------------------------------
Seg0x21c@870000:0F0C
Seg0x21c@870000:0F0C                   loc_870F0C:                             ; CODE XREF: sub_870EEC+Aj
Seg0x21c@870000:0F0C 0E 74                             bclr    word_FDE8.0
Seg0x21c@870000:0F0E 0D 04                             jmpr    cc_UC, loc_870F18
Seg0x21c@870000:0F0E
Seg0x21c@870000:0F10                   ; ---------------------------------------------------------------------------
Seg0x21c@870000:0F10

Same, it is still high

edit:
At 70BEE is also bmovn word_FDE8.0, USR0
Chaged that to bclr word_FDE8.0 I have now low on output pin. Thank you
Now I want to translate that to 4Z7907551D ECU

Also pin 7.0 is connected via stage output to 114 pin on ECU connector, It can also be used


« Last Edit: November 04, 2022, 08:52:28 PM by BlackT »	Logged

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