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T56 with 06 LQ4 Harness/ECU

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Old 09-30-2015, 06:21 PM
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Default T56 with 06 LQ4 Harness/ECU

I am working on the wiring for the LQ4 in my Chevelle. I have HPTuners so I can change the transmission setting to manual for the T56 but I have a couple questions relating to the swap:

1. Is there a way to add reverse lockout to the truck computers through the tuning software?

2. Does selecting the "manual" option add the clutch pedal position function for disabling cruise control? Is it as simple as adding a wire to pin 35 on the blue connector? Also does the computer need to see +12 volts or ground with the clutch pedal depressed?

Thanks for the help!
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Old 10-05-2015, 10:18 AM
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It looks like 2004 Corvettes used the same pcm and has the same pinouts as the 03-05 trucks. That leads me to believe there should be a reverse lockout function available on the truck pcms.
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Old 10-06-2015, 12:06 PM
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If your lq4 pcm is setup for an automatic you need to do a segment swap to make it a manual tune. You would have to find a manual tune with the same OS to do the swap. At least that is what I understand from everything I have read.
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Old 10-06-2015, 02:19 PM
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Originally Posted by gagliano7 View Post
If your lq4 pcm is setup for an automatic you need to do a segment swap to make it a manual tune. You would have to find a manual tune with the same OS to do the swap. At least that is what I understand from everything I have read.
Thats the best way to do it.
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Old 10-07-2015, 12:19 AM
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How can I tell if it's the same operating system? I guess I will need version 2.25 to get access to the segment swap function.
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Old 10-07-2015, 06:26 AM
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Here is a screenshot of mine. It is under edit>calibration details.

VCM OS ID:
Attached Thumbnails T56 with 06 LQ4 Harness/ECU-caldetails.png  
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Old 11-18-2015, 06:32 PM
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I sent the file to HPTuners support and was given a link to download a version 2.25 beta with reverse lockout added. I flashed the updated file to the ECU and now I have reverse lockout!

I'm still confused about how to dead with cruise control. Can I use the CPP input to disable cruise or was that only used for clutch anticipation? My only other option is to connect the CPP switch to the ECU's brake switch input. That would be fine but I would have to use some sort of diode to keep the brake lights from coming on when I press the clutch pedal.
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Old 12-07-2017, 02:30 AM
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What did you end up doing entirely for this ECU and harness modification? I'm putting in the LQ4 and T56 trans as well into my chevelle.

I want to know if I can get an ECU or harness from a 4.8L, 5.3L or a 6.0L? Or do I have to go with the 6.0L no matter what? You mentioned the 2004 corvette...is that the entire generation or just that year? Sorry to revive the thread, I'm really good at that lol
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Old 12-07-2017, 11:00 AM
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I hope he answers after 2 years...
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Old 12-07-2017, 11:24 AM
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Originally Posted by G Atsma View Post
I hope he answers after 2 years...
Lol, I've revived 7+ year old threads, I'm good at it like I said
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Old 12-07-2017, 01:29 PM
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Originally Posted by crmd37 View Post
Lol, I've revived 7+ year old threads, I'm good at it like I said
Well. There ya go! lol
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Old 12-09-2017, 12:52 AM
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any truck harness can be used with matching ecm. Just cut trans side off or unwire from harness. Swap a OS from a corvette, GTO, etc. with a manual to make it work. Easy swap!
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