C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

LS2 TB IAC not working

Thread Tools
 
Search this Thread
 
Old Sep 18, 2006 | 10:31 PM
  #1  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default LS2 TB IAC not working

I have a 01 C5 With a 402, LS2 TB and a Adapter Harness. My IAC is not moving from 149 where it is set. I put a stock GTO TB on it and it still didnt move. Is there a chance that the wires on the adapter harness are pinned incorrectly?

Last edited by SCannon; Sep 18, 2006 at 10:50 PM.
Reply
Old Sep 18, 2006 | 10:49 PM
  #2  
mfrejek's Avatar
mfrejek
Instructor
 
Joined: Jun 2006
Posts: 222
Likes: 1
From: Rapid City SD
Default

do you have a service manual and a multimeter?

by the way, I know what a IAT and TAC are, what is an IAC?

Last edited by mfrejek; Sep 18, 2006 at 10:56 PM.
Reply
Old Sep 18, 2006 | 11:01 PM
  #3  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

I believe Intake Air Control
Reply
Old Sep 18, 2006 | 11:01 PM
  #4  
zo6vetteman2003's Avatar
zo6vetteman2003
Drifting
 
Joined: Jun 2005
Posts: 1,824
Likes: 1
From: Middleboro Massachusetts
Default

Originally Posted by SCannon
I have a 01 C5 With a 402, LS2 TB and a Adapter Harness. My IAC is not moving from 149 where it is set. I put a stock GTO TB on it and it still didnt move. Is there a chance that the wires on the adapter harness are pinned incorrectly?
The plugs on the adapter harness only connect one way. You may have bent a pin, I would check that first.
Are you tuning, or tuned using LS1edit, EFIlive or HPTuners?
Reply
Old Sep 19, 2006 | 08:05 AM
  #5  
see5's Avatar
see5
Safety Car
15 Year Member
 
Joined: Jan 2001
Posts: 3,879
Likes: 3
From: Hobart, WI
Default

I have heard of this being the case. Send me an email and I will send you the wiring instructions. With that and meter you should be able to figure it out.
Reply
Old Sep 19, 2006 | 05:20 PM
  #6  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

vette@hotrodz.org

I read that I am sopposed to take the 2 wires that dont get used and tie them in with 2 wires that do get used?

Last edited by SCannon; Sep 19, 2006 at 05:22 PM.
Reply
Old Sep 19, 2006 | 09:19 PM
  #7  
RoadRebel's Avatar
RoadRebel
Melting Slicks
15 Year Member
 
Joined: Mar 2003
Posts: 3,116
Likes: 10
From: Macomb MI
Default

There is no such thing as an IAC on a driveby wire (ETC) throttlebody.
Only Cable drivin TBS have and IAC

Phil
Reply
Old Sep 19, 2006 | 09:21 PM
  #8  
see5's Avatar
see5
Safety Car
15 Year Member
 
Joined: Jan 2001
Posts: 3,879
Likes: 3
From: Hobart, WI
Default

I think he means TPS.
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

 Michael S. Palmer
story-1

5 Best & 5 Worst Corvette Daily Drivers

 Joe Kucinski
story-2

The Headlights of Every Corvette Generation Explained

 Joe Kucinski
story-3

5 Best & 5 Most Overrated Corvette Track Packages of All Time!

 Joe Kucinski
story-4

Every 2027 Corvette Engine Explained

 Joe Kucinski
story-5

Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

 Verdad Gallardo
story-6

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-7

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-8

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-9

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
Old Sep 19, 2006 | 10:23 PM
  #9  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

Originally Posted by RoadRebel
There is no such thing as an IAC on a driveby wire (ETC) throttlebody.
Only Cable drivin TBS have and IAC

Phil
In the tuning why do people set the IAC steps to 149 instead of 310? Does the motor control the IAC with the throttle plate?
Reply
Old Sep 19, 2006 | 10:50 PM
  #10  
zo6vetteman2003's Avatar
zo6vetteman2003
Drifting
 
Joined: Jun 2005
Posts: 1,824
Likes: 1
From: Middleboro Massachusetts
Default

Originally Posted by SCannon
vette@hotrodz.org

I read that I am sopposed to take the 2 wires that dont get used and tie them in with 2 wires that do get used?
This sounds like the 2 white wires on the existing plug. I can give you the pin # and wiring order by wire color.
Reply
Old Sep 20, 2006 | 05:35 PM
  #11  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

Can someone clarify how the pcm controls the Idle air control.
Reply
Old Sep 21, 2006 | 07:20 AM
  #12  
zo6vetteman2003's Avatar
zo6vetteman2003
Drifting
 
Joined: Jun 2005
Posts: 1,824
Likes: 1
From: Middleboro Massachusetts
Default

Originally Posted by SCannon
Can someone clarify how the pcm controls the Idle air control.
It is a setting within the PCM. I asked earlier if you had tuning. LS1edit, EFIlive or HP tuners can open the throttle position at idle. The wiring harness is a plug in play.
Reply
Old Sep 21, 2006 | 05:47 PM
  #13  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

Originally Posted by zo6vetteman2003
It is a setting within the PCM. I asked earlier if you had tuning. LS1edit, EFIlive or HP tuners can open the throttle position at idle. The wiring harness is a plug in play.
The Harness must not be a plug and play deal if everyone on here and multiple illustrations show the Green and Yellow wire being tied together and the purple and white being tied together. The other end of the plug and play harness does not use the yellow and the white? Am I not supposed to tie these wires together before the plug in harness?
Reply
Old Sep 21, 2006 | 06:37 PM
  #14  
see5's Avatar
see5
Safety Car
15 Year Member
 
Joined: Jan 2001
Posts: 3,879
Likes: 3
From: Hobart, WI
Default

Originally Posted by SCannon
The Harness must not be a plug and play deal if everyone on here and multiple illustrations show the Green and Yellow wire being tied together and the purple and white being tied together. The other end of the plug and play harness does not use the yellow and the white? Am I not supposed to tie these wires together before the plug in harness?
There are two sets of - and +5 reference voltage wires so the [Green & Yellow] and [Purple & White] are the same thus you can combine them or not.
Reply
Old Sep 21, 2006 | 09:25 PM
  #15  
SCannon's Avatar
SCannon
Thread Starter
Pro
15 Year Member
 
Joined: May 2005
Posts: 710
Likes: 0
From: Northfield Center Ohio
Default

Now it makes sense, in all the posts about this I have not seen anyone mention this. Thanks for the info.
Reply
Old Sep 22, 2006 | 09:15 PM
  #16  
zo6vetteman2003's Avatar
zo6vetteman2003
Drifting
 
Joined: Jun 2005
Posts: 1,824
Likes: 1
From: Middleboro Massachusetts
Default

Originally Posted by SCannon
The Harness must not be a plug and play deal if everyone on here and multiple illustrations show the Green and Yellow wire being tied together and the purple and white being tied together. The other end of the plug and play harness does not use the yellow and the white? Am I not supposed to tie these wires together before the plug in harness?
On my adapter harness the two white wires from the existing side are not used. All other colors match up. On the other plug, yellow to yellow brown to brown.
Reply

Get notified of new replies

To LS2 TB IAC not working





All times are GMT -4. The time now is 04:43 AM.

story-0
2027 Chevrolet Silverado 1500 First Look: Everything You NEED to Know!

Slideshow: Is the 2027 Chevrolet Silverado 1500 the best Silverado yet?

By Michael S. Palmer | 2026-06-16 08:01:12


VIEW MORE
story-1
5 Best & 5 Worst Corvette Daily Drivers

Slideshow: 5 best and 5 worst Corvette daily drivers

By Joe Kucinski | 2026-06-15 10:32:13


VIEW MORE
story-2
The Headlights of Every Corvette Generation Explained

Slideshow: The headlights of every Corvette generation explained

By Joe Kucinski | 2026-06-15 10:17:14


VIEW MORE
story-3
5 Best & 5 Most Overrated Corvette Track Packages of All Time!

Slideshow: The 5 best and 5 most overrated Corvette track packages ever.

By Joe Kucinski | 2026-06-09 12:46:45


VIEW MORE
story-4
Every 2027 Corvette Engine Explained

Slideshow: Every 2027 Corvette engine explained

By Joe Kucinski | 2026-06-09 12:16:31


VIEW MORE
story-5
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette

Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.

By Verdad Gallardo | 2026-06-08 19:53:43


VIEW MORE
story-6
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-7
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-8
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-9
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE