Mix and match engine, PCM and TAC
Thread Starter
Teching In
Joined: Mar 2021
Posts: 10
Likes: 0
From: NS, Canada
Mix and match engine, PCM and TAC 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
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
TECH Enthusiast
Joined: Jul 2019
Posts: 636
Likes: 187
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
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
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.
Thread Starter
Teching In
Joined: Mar 2021
Posts: 10
Likes: 0
From: NS, Canada
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
TECH Enthusiast
Joined: Jul 2019
Posts: 636
Likes: 187
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
