Re: Couldnt really find a section for this..
Posted: Fri Dec 30, 2011 2:01 am
great work festy, thanks
pcmhacking.net
Electronic Fuel Injection - Developement & Tuning
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Couldnt really find a section for this..
Page 29 of 43
Re: Couldnt really find a section for this..
Posted: Fri Dec 30, 2011 10:01 am
X05ff is the checksum function.
Re: Couldnt really find a section for this..
Posted: Sat Dec 31, 2011 1:12 pm
X0961 instant fuel calc?
any ideas on the checksum for the mc code? runs but fails diag if it's not 7100
any ideas on the checksum for the mc code? runs but fails diag if it's not 7100
Re: Couldnt really find a section for this..
Posted: Sat Dec 31, 2011 1:17 pm
What's mc?
Re: Couldnt really find a section for this..
Posted: Sat Dec 31, 2011 1:35 pm
*microcontroller
once disassembled then assembled following hex add's are changed to FF once changed back to their orig values works again, can manipulate the values for these to get the 7100 checksum correct without causing issues if code is changed.....
not sure if that's anything important or just my luck assembling
once disassembled then assembled following hex add's are changed to FF once changed back to their orig values works again, can manipulate the values for these to get the 7100 checksum correct without causing issues if code is changed.....
Code: Select all
0009 00 000A 00 0158 90 0159 03 015a E7
0696 86 0697 87 0738 00 0739 00
0906 00 0907 00 0E3B C1 0E3C 90
needs 0FFE & 0FFF added as 00 each for size checksumRe: Couldnt really find a section for this..
Posted: Thu Jan 05, 2012 12:11 am
Wow, i didnt realize this was still going. I do have a question in relation to this topic, but its not quite the same.
The odo gets its read out from the speedo? Meaning if i plunged in a dash, wired in a speedo sensor to make the speedo work the odo would tick up if i was to spin the speedo sensor with a drill or such?
Just thinking outside the box :/
The odo gets its read out from the speedo? Meaning if i plunged in a dash, wired in a speedo sensor to make the speedo work the odo would tick up if i was to spin the speedo sensor with a drill or such?
Just thinking outside the box :/
Re: Couldnt really find a section for this..
Posted: Thu Jan 05, 2012 7:28 am
you created a monster when you posted your original question 6 months ago 
To answer your question: yes, spinning a VSS should wind it up - but I think this was discussed a few pages back, but using an oscillator to send pulses in place of a VSS.
Someone (me maybe?) posted a rough estimate on how long it would take - it's definately quicker to order an ebay programmer from China and wait for the postman than to make a significant change to the odo by faking VSS pulses.
You'd also have to be careful not to pulse too fast or you might bend your speed needle
Are you still looking to get your odo reprogrammed?
To answer your question: yes, spinning a VSS should wind it up - but I think this was discussed a few pages back, but using an oscillator to send pulses in place of a VSS.
Someone (me maybe?) posted a rough estimate on how long it would take - it's definately quicker to order an ebay programmer from China and wait for the postman than to make a significant change to the odo by faking VSS pulses.
You'd also have to be careful not to pulse too fast or you might bend your speed needle
Are you still looking to get your odo reprogrammed?
Re: Couldnt really find a section for this..
Posted: Thu Jan 05, 2012 1:21 pm
Ah true, cheers mate, nah im not looking to program mine, i just like thinking up little mad scientist projects to do out of sheer boredom. Im not that crash hot with computers and programs which is why i thought of this way. And to stop the needle bending.. Remove it?
Re: Couldnt really find a section for this..
Posted: Thu Jan 05, 2012 2:23 pm
So after a talk with Festy i realized a drill or similar, if i made it run at 200km/h would take 4000hours. He mentioned sending pulses through an "oscillator" would work better, ill be checking this out and see what i discover.
Re: Couldnt really find a section for this..
Posted: Thu Jan 05, 2012 4:59 pm
wouldn't need the hole cluster to do it that way, just feed the signal into the lcd unit while powered up (4/5 wires 1-2 gnd's, pwr, ign, pulse) that'd save causing damage to the speedo unit, still a very sloowww method 
the mention of an oscillator again reminds me of the old 555 pulse generator truckies used to use to defeat the early gen speed limiters, so it wouldn't have to be a complicated circuit.
555 timer, few caps and a 1:1 audio transformer/isolator from memory, could make a useful tool to test the calibration of speedo's.
the mention of an oscillator again reminds me of the old 555 pulse generator truckies used to use to defeat the early gen speed limiters, so it wouldn't have to be a complicated circuit.555 timer, few caps and a 1:1 audio transformer/isolator from memory, could make a useful tool to test the calibration of speedo's.