Throttle problem

[dayj1]

Originally Posted by upon1

Had the guy that built the harness look at it and he thinks it’s a mismatched tac and pedal. Motor is a 2001 and the the pedal itself is all plastic so he thinks it’s out of a newer unit.

I'm with ls1nova71 (and your harness builder) in that you have mismatched parts. As long as you end up with a matched set of PCM/harness/TB/TAC/pedal you can get a working setup.

I'm speaking under the assumption that you would like to keep your PCM/harness as you've already spent time/money on those and a different (blue/green) PCM won't just "plug in". With that in mind, if you have an all plastic pedal, it's at least a 2006 model pedal and NOT compatible with the early DBW. If your TB only has a single 8 pin connection, then it's 2003 to early '07 and also not compatible with the early DBW. The correct TB for your ECM has two connectors (one for TPS and one for the throttle blade motor). If your TAC has the aluminum bracket (as opposed to all plastic), it is also not compatible with the early DBW setup.

Here's a link with some pics of the different components.

http://chevythunder.com/drive_by_wire.htm

[ls1nova71]

Originally Posted by dayj1

I'm with ls1nova71 (and your harness builder) in that you have mismatched parts. As long as you end up with a matched set of PCM/harness/TB/TAC/pedal you can get a working setup.

I'm speaking under the assumption that you would like to keep your PCM/harness as you've already spent time/money on those and a different (blue/green) PCM won't just "plug in". With that in mind, if you have an all plastic pedal, it's at least a 2006 model pedal and NOT compatible with the early DBW. If your TB only has a single 8 pin connection, then it's 2003 to early '07 and also not compatible with the early DBW. The correct TB for your ECM has two connectors (one for TPS and one for the throttle blade motor). If your TAC has the aluminum bracket (as opposed to all plastic), it is also not compatible with the early DBW setup.

Here's a link with some pics of the different components.

http://chevythunder.com/drive_by_wire.htm

This pretty much sums it up. So basically what it appears you have is a 99-02 PCM, 03-05 or 06-07 TAC and a 2006 pedal. That is a really messed up set up. You need to pst up what part number is on your TAC, its printed on it with a barcode. That way we will know if your pedal will work. If it will, you should only need a new PCM.

[upon1]

I may have found an earlier pedal to use. Hopefully that’ll fix it. The motor comes up as a 2001 and I didn’t change the throttle body on it.

[upon1]

Throttle body has a single 8 pin from what I can tell

[dayj1]

That TB is the "late" Gen 3 style used from '03 to mid year '07. The TAC module you have is part 12590008 and was only used from '06 to mid '07. You said your pedal was all plastic, so it's probably the '06 to mid '07 one as well (as opposed to the mid '07 and up Gen 4 pedal)

So, you've got an 01 harness and PCM but all the DBW parts for an '06/early '07.

Unfortunately, just swapping the pedal isn't going to get you going.

[upon1]

Throttle body has a single 8 pin from what I can tell

[ls1nova71]

Like dayj1 said, changing the pedal isn't going to help. The fact that you have a blue/red PCM, means its an older '99-02, and there's no way it will work with the newer parts you have. You NEED a newer PCM with a '06 tune......

[ls1nova71]

The 411 PCM was only used until '02, so when it showed 2001, that's the year of the PCM/tune in it. It WONT run the newer TB. If your harness is set up for the 8 pin TB plug, you should be able to switch the red plastic parts on the PCM connectors with green ones, get a '06 PCM and be in business.