GEN IV swap AFM is not enabled

[harascho]

I am comming to the finish line with the 5.3 LMG swap into my 1997 Tahoe.

One last thing is, I do not get all the conditions that AFM is enabling.
After going through all the necessary conditions it seems that one thing that could inhibit V4 mode is the vacuum brake booster pressure sensor. It is read by the EBCM and then distributed via the CAN bus. So here's the problem, there is no easy way to get that sensor status on the CAN bus without an EBCM.

Are there any possibilities EFIlive could disable some modules / conditions so that my E38 ECM is able to switch to V4 mode?

Any suggestions?

Harald

[VEGASROBBI]

I'm up against the same wall I believe I met all the conditions to enable AFM also; except the Brake booster sensor(82' Toyota 4 x 4).

You are correct, the sensor data is sent via serial data to the ECM from the EBCM. The brake booster pid always reads 0 volts on the scan tool otherwise.

My engine is from a 07' Siverado and there are two different EBCM's, one with JL4 and one without. The one without does not have the brake booster sensor but still has an E38. So I'm thinking trucks with AFM have JL4?

I can't find any condition to change in the ECM calibration regarding the brake booster sensor.

Sorry this doesn't help, I'm thinking out loud. It must be pass thru data from the EBCM the ECM reacts too, so maybe a OS patch is the solution.

Maybe I'm thinking too hard and there is a simple solution Seems to me I've read about conversions where AFM works without the EBCM.

[harascho]

Now we are three with the same problem. Patrick is at the same point with his 5.3 LMG swap.
If there are two different E38 calibrations out there ( with and without bosster sensor..) we should check if a suitable version of the E38 software calibration without bosster pressure sensor exists. As far as I know all '07 5.3's had AFM, so this is not the point.

Harald

[GAMEOVER]

Hey guy's, I'm trying to figure out why my AFM won't enable after I disabled it to see what my MPG was without it!!! Maybe there's something else involved...Can't figure it out...The last thing to try is my stock ECM, which I replaced with my current ECM(for tuning purposes)

[joecar]

GAMEOVER, have you tried flashing in any of your previous tune files (from prior to where AFM was disabled)...?

[GAMEOVER]

Yes, I tried it yesterday. Ross told me that it might work but still wouldn't work....

[GAMEOVER]

Maybe it's not the ECM...

[GAMEOVER]

I'm going to try my stock ECM this weekend and maybe that'll be the fix

[GTPprix]

If you can find anyone near Michigan with this issue let me know, I can throw that frame on the bus for someone and see if it turns on. If so it wouldnt take too much to design an interface that simply grabs can hi/low and transmits the frame at the appropriate intervals.

[VEGASROBBI]

There are several 5.3's offered in the 07' Silverado Classics which do not have AFM. I see three brake systems offered and none have the booster sensor. It would be interesting the compare calibrations but since the Classics don't have AFM it's not promising.

I think GTPprix is on the right track. If he could simulate the bus data, and AFM enables it would at least verify our suspicions.

GAMEOVER make sure your COT is enabled, I heard disabling it will take out AFM