Which 24x PCMs have E85 capability and which of those have IAC control?

[GrannySShifting]

An 04-05 van OS is one correct?

[MikeOD]

There's a 2002 OS used in SUV's that can do it. It's 12216125. That's a P01...all P01's have IAC drivers.

The P59 is the newer ECM...I've never personally run into it, but I've heard some of them do not have IAC drivers present on the circuit board...for all I know some of the 2003-2006 trucks I've tuned are this way...but I never tried to convert them. A good OS to use from a P59 is a flex fuel 5.3...say from an Avalanche.

2002 Tahoe Flex Fuel.hpt

2005 Avalanche Flex Fuel.hpt

[GrannySShifting]

Do you really have to opened them up to see if there is an IAC driver on board or is there a service number that would tell you this?

[MikeOD]

I honestly don't know...if you turn off the ETC in the System Options table and the IAC isn't responsive...then I guess there's no driver. Like I said I've never personally run into it, so I don't know for sure.

[Eaglegoat]

Part number 12586243 is what you're looking for, 1mb p59 pcm. 4l80e, flex fuel, IAC, and analog AC compatible OS's available.

[MikeOD]

Can you post a read from one of them?

[2xLS1]

These are the only P59 PCMs that have IAC drivers. Service number and hardware number must match exactly.

2007
Service # - 12602801
Hardware # - 12589161

2006 - 2005
Service # - 12589462
Hardware # 12589161

2004
Service # - 12586243
Hardware # - 12583659

2003
Service # - 12576106
Hardware # - 12570558

[Eaglegoat]

http://www.tunedbyfrost.com/products_pcm03.htm

[Eaglegoat]

Can you post a read from one of them?

What are you looking for? Just any random OS from one of those pcms?

[MikeOD]

What are you looking for? Just any random OS from one of those pcms?

Yeah, any random one that's got factory flex fuel and analog AC. Whenever I try to enable flex fuel on a P59, we are missing access to something...or just tell me what changes you made for analog AC.

[hellbents10]

Why not a 411 controller with a tahoe flex fuel vin? I am using one now with a 80e segment and 2bar OS with a new style sensor.

[Eaglegoat]

Why not a 411 controller with a tahoe flex fuel vin? I am using one now with a 80e segment and 2bar OS with a new style sensor.

Could you post that please?

[Eaglegoat]

Yeah, any random one that's got factory flex fuel and analog AC. Whenever I try to enable flex fuel on a P59, we are missing access to something...or just tell me what changes you made for analog AC.

I don't know any that have that. My plan is to use the "603" OS as it's very close the the 04 GTO "604" OS which is analog AC. There's even been guys that have hex edited a 4L80e segment from 603 into 604 and had it work. That's how similar they are.

[mecanicman]

actually 603 has more in common with with 12592425, all segments are same size and locations. As for the 4l80 segment, of the 8 o/s's that I know of for 2004 only one is not interchangeable with the others.

I have attached 12216125 o/s.

[GrannySShifting]

Has IAC drivers

• 12200411 ? xxxxxxxx ? 2002 F-Body, Corvette, S10, IAC DRIVERS INSTALLED
  09354896 ? xxxxxxxx ? IAC DRIVERS INSTALLED.
  12576106 ? 12570558 ? 2003 G-VAN, LM7, IAC DRIVERS INSTALLED. ALSO C-TRUCK LM7
  12586243 ? 12583659 ? 2004 GTO LS1, IAC DRIVERS INSTALLED (+4L80E Segment + Analog AC)
  12589462 ? 12589161 ? 2005 G-VAN, LQ4, IAC DRIVERS INSTALLED
  12602801 ? 12589161 ? 2006 ? 2007 Express, Drive by Wire, IAC DRIVERS INSTALLED

Does not

• 12582605 ? 12580786 ? 2003 C-MPV, L59
  12586242 ? 12583660 ? 2004 C/K-TRUCK, LM7
  12589463 ? 12589162 ? 2005 C/K-TRUCK/MPV, LM7, LQ4
  12589463 ? 12589162 ? 2006 C-PICKUP, LM7
  12602802 ? 12589162 ? 2006 C-PICKUP, L59

https://www.mrk-motorsports.com/gm-iac-pcms/

[ant.l.jones.jr]

my 02 yukon has the l59 with iac drive by wire no egr from factory

[AngryBear]

03-07 Silverado with the 4.3 were all drive by cable. Here?s some info that might help:
http://lt1swap.com/cable_conversion.htm