Bobbywolf

Ok, I got a 06 LQ4 from a chev van, missing lots of parts. It came with a TAC, harness and pedal from a 06 pickup. I have a Intake and TB from a 06 truck as well. The TAC, harness and pedal all work, as confirmed by swapping them into my Jeep, which has a 06 LQ9 setup, and they function fine.

I have an PCM from a 04 chev pickup.

With everything assembled on a stand, the pedal works to only part throttle (and the TB begins to move), and then stops. Reading the codes, I see a U0107 "Lost comms with TAC muodule"
Doing some reading, most folks say that you need EVERYTHING to match years. PCM, TAC, TB & pedal. While others say that if the TAC, TB & pedal are matched, you should be good.

Can anyone clarify for me? Can I use the 06 throttle setup on a 04 PCM? or do I need to look for an 06 PCM?

Rob

bobcratch

you can't use an 06 pedal/tac with a 2004 pcm, UNLESS THE 2004 PCM IS FLASHED TO THE 2006 OPERATING SYSTEM.

the '03 to '05 pedal/tac module/operating system are compatible, and 06/07(classic) pedal/tac module/operating system are compatible. But you cannot mix and match between the two without, as you discovered, getting faults and lack of throttle response.

as far as i know, the limitation is not the PCM itself, it's the operating system.

Bobbywolf

Yea, that is sort of what I figured. I am holding off buying the HP tuner credits to unlock the PCM until I either get hold of a 06 PCM, or an earlier set of pedal, TAC and TB. I may pull the PCM out of my LQ9 setup so I can run this on the stand. It should be tuned close enough to hear the LQ4 run. I'll be on the lookout for another 06 PCM

bobcratch

consider investing in obdxprovt ($80 usd, not sure canadian). and then you can use the free suite of tunerpro, universal patcher, and PCMHammer. It would cost you less than the HPT credits and you would gain a lot of flexibility.