I see B0203... Is this a prologue to fuel limiting tables related to the MAF by chance?
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I see B0203... Is this a prologue to fuel limiting tables related to the MAF by chance?
I don't see timing table "D" anymore. I had some trucks that would run off of "D" at times. Thoughts?
Looking at the descriptions now I think the "D" was maybe just one of these others. Looks like "A" is where our problem has been laying Jody. Let the good times roll, anyone want to by a LBZ? Think I'll be in the market for a LMM!
Rob, the old 'D' table was simply not right, as they are configured now everything should fall in to line. The regen tables are rather odd though (when post injections are on), I've left them out for now, they are not the same size or structure of the A,B,C tables. I'll add them, but for now I figure the others were more important.
Jody, I'd be interested to hear if you think the ECM is still using what was the 'D' table. I don't know why they made such a severe change between the LBZ & LMM with these tables but really, 12 main timing tables!
For you shutting off the pilot's then 'A' should be the tables you are using.
The B0205 MAF was to help for the P0103 DTC (I think that was the right number).
Please let me know how you go with this update.
Cheers,
Ross
I was trying some timing changes to see if they had a effect on the cold engine noise this truck makes. I put all the tables back to stock timing except at wot areas. Did a log and noticed that right after a wot 4-5 shift the rpms dropped to just under 2500 and the timing dropped to 1.5 degrees............... :bad: I looked through the tables and noticed that D matched that exactly, so I assumed it was using D at that point. Thing is, it could not have been in regen............... :)
Jody
Just to clarify, 'D' should not exist in the new maps, you should be seeing only A - C.
B0920 - B0923 should be used when only the Main is on.
B0924 - B0927 should be used when Main + Pilot 1 is on.
B0928 - B0931 should be used when Main + Pilot 1&2 are on.
GM.MAINTSEL_DMA should show you which combination are being used.
If it's still not making sense can you please post a log file with the PID GM.MAINTSEL_DMA shown.
I suspect that the transient tables are what it fell in to after the shift, they are quite low (less than 0 deg at 2500)
Cheers,
Ross
First of all i never had a problem with the MAF trowing codes so i don't know if it helped in that dept. But i would have figured that if it was set to "not equipped" then the ecm would not use it? But i can still log accurate values from the MAF? Is it more of a thing where it shuts off the performance testing of the MAF?
ok, did some more datalogging today. The extra timing tables didn't help with my issue.
If I just zero out the pilot table area for wot, you still get a pilot 1. If you zero out the pilot 1 area for full fuel pressure (180 and 190 mpa) it drops to 150US, but still on. If you go into the fuel pressure pulse allowed table and set it for 1 pulse only, the pilot is off, but unfortunately the timing is gone. I changed every table at every elevation, including transients to 20-28 degrees from 2500 to 3500 rpms; I get a max of 17.5 degrees, so there is appears to be a missing timing or limiter table tied to the fuel pressure pulse table.
I have an idea to get the pilot 1 to shut off, and will post back after I try it.
I definitely appreciate your time spent on this Ross.
Jody
hey jody you may want to check your egr settings this was a issue on my truck a while ago and cause the same condition you are refering to. i have had no air valve on my truck for 60,000 miles no issues becuase of it. I dont know if you have tried setting your air valve settings to this but you can try this as well for your air valve.
10.000000
1.000000
10.000000
1.000000
20.000000
300.000000