wideband logging

[steveo]

i think i did? F4 t-side E4 e-side or some such thing?

[RobertISaar]

that is how it appears to be setup.

[steveo]

i think i just ran all two and three byte combinations all the way from 0x00 to 0xff and logged the results.

unfortunately, this is just a theory, but those results i have on anything other than F4 might be unreliable.

my software is stateful enough now to know how long it's been since a valid reply, and resends F4 a disable comms and confirms silence if it's been too long.

.... but it wasn't back then, those were early days

i think it's only valid requests on F4 that reset the disable comms counter on the ecm (which seems approx 3 seconds long, so i consider 2500ms a good 'nuff threshold). i don't even know for sure that requests to E4 will make it maintain silence.

so i bet they're peppered with random idle chatter by the time it actually counted up to E4, which would have taken a hell of a lot longer than 3 seconds. that explains why i was getting weird short packets from requests that shouldn't have done anything.

i think i'll just do it again.

[steveo]

i found the files i had leftover, but no useful queries from E4. i'll do another run across E4 tonight see if anything comes out.

[steveo]

I tried a fairly large set of requests to e4 and couldn't get it to spit anything out at all; ill have to keep working on it;

Robert, the aldl comms would use the 68hc11 standard serial line register right? I haven't tried to look for them yet

[RobertISaar]

i assume it would. it is just a 68HC11F1 after all is said and done. if it doesn't, i'd be curious to know how the flash bootloader actually gets to the E-side. if it doesn't get there directly over the UART/ALDL link, then it could only get there from being passed over SPI from the T-side....

i can't think of any more comm schemes that could possibly be used?

[kevinodb1]

Hello Steveo and others

I know this is an older thread but cannot find a more recent one.

I have finally got around to trying to connect my Innovate LM-2 analogue output to the A/C pressure port for logging purposes....

However it turns out to be a little vague and somewhat scary process!?

AC PRESSURE SENSOR TWO HALVES SEPERATED READY TO SOLDER WIRES ON.jpg

I got a second hand A/C pressure sensor and chopped it at the parting line so I could have the correct connector to easily install it on both my 94 and 92 Corvettes.

Attached are what is inside, a Melexis microchip, with the electronics earthed to the case.

I carefully unsoldered the electrical ribbon from the connector and am left with 3 pins that match the 3 wires that go of into the wiring loom.

However the Analog output from the LM-2 can be wired up 3 different ways according to the manual, I do not have the knowledge about 5V A/D circuitry to be confident about making the correct connections for this to work safely.

I confirmed with Logworks that the Analogue port is set to the 7.xx and 22.xx values, but when measuring to earth I get 7.x volts from one of the wires and the differential of the two wires does not match the AFR correctly according to the formula in EEHACK.

I am not keen to supply more than 5 volts up to the ECM/PCM ports........

Can anyone assist me in what to connect where please as I believe this is a MUST HAVE addition for tuning as trying to compare separate AFR graphs to logged data without it being time matched is rather challenging and potentially inaccurate.

Thank you in advance.

Cheers
Kevin
Wellington
New Zealand