TCC takes me from OD to 3rd
Thread Starter
Joined: Jul 2019
Posts: 116
Likes: 13
From: Indianapolis, In
TCC takes me from OD to 3rd Hi guys
recent LS2 swap in my wagon. Using a summit 4l60e and Holley x max. Weird issues regarding my tcc engagement. When it locks and I am in OD, it down shifts to 3rd on its own. Ecm shows tcc and 4th commanded, but the Tcc isn’t even locked in 3rd either.
Looked at the tune and that is good. Not sure if valve body harness or Holley harness related. I verified that the power is good and clean on the Holley. I am going to send tune and data log to Holley but wanted to see if anyone had this. Not sure if line pressure drops in od and tcc. Heavy roadmaster wagon, 3.23 gears, 245/45/20.
recent LS2 swap in my wagon. Using a summit 4l60e and Holley x max. Weird issues regarding my tcc engagement. When it locks and I am in OD, it down shifts to 3rd on its own. Ecm shows tcc and 4th commanded, but the Tcc isn’t even locked in 3rd either.
Looked at the tune and that is good. Not sure if valve body harness or Holley harness related. I verified that the power is good and clean on the Holley. I am going to send tune and data log to Holley but wanted to see if anyone had this. Not sure if line pressure drops in od and tcc. Heavy roadmaster wagon, 3.23 gears, 245/45/20.
TECH Junkie
Joined: Jun 2008
Posts: 3,203
Likes: 1,391
From: Nitro Alley
Fluid Level may be actually Low...
Most ATF Dipsticks are actually inaccurately Marked.
Try adding an extra Quart, but you should really take pressure readings first.
Probably why you did not get any responses...
Levels and Pressures are like minimum requirements when Posting here.
Most ATF Dipsticks are actually inaccurately Marked.
Try adding an extra Quart, but you should really take pressure readings first.
Probably why you did not get any responses...
Levels and Pressures are like minimum requirements when Posting here.
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
Hi guys
recent LS2 swap in my wagon. Using a summit 4l60e and Holley x max. Weird issues regarding my tcc engagement. When it locks and I am in OD, it down shifts to 3rd on its own. Ecm shows tcc and 4th commanded, but the Tcc isn’t even locked in 3rd either.
Looked at the tune and that is good. Not sure if valve body harness or Holley harness related. I verified that the power is good and clean on the Holley. I am going to send tune and data log to Holley but wanted to see if anyone had this. Not sure if line pressure drops in od and tcc. Heavy roadmaster wagon, 3.23 gears, 245/45/20.
recent LS2 swap in my wagon. Using a summit 4l60e and Holley x max. Weird issues regarding my tcc engagement. When it locks and I am in OD, it down shifts to 3rd on its own. Ecm shows tcc and 4th commanded, but the Tcc isn’t even locked in 3rd either.
Looked at the tune and that is good. Not sure if valve body harness or Holley harness related. I verified that the power is good and clean on the Holley. I am going to send tune and data log to Holley but wanted to see if anyone had this. Not sure if line pressure drops in od and tcc. Heavy roadmaster wagon, 3.23 gears, 245/45/20.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Thread Starter
Joined: Jul 2019
Posts: 116
Likes: 13
From: Indianapolis, In
hi. According to the holley pin out yes, also verified continuity for all pin outs. I did notice that disabled tcc actually locks at 55 mph and my brake unlocks it. Again it’s disabled in the tune.
Thread Starter
Joined: Jul 2019
Posts: 116
Likes: 13
From: Indianapolis, In
Fluid Level may be actually Low...
Most ATF Dipsticks are actually inaccurately Marked.
Try adding an extra Quart, but you should really take pressure readings first.
Probably why you did not get any responses...
Levels and Pressures are like minimum requirements when Posting here.
Most ATF Dipsticks are actually inaccurately Marked.
Try adding an extra Quart, but you should really take pressure readings first.
Probably why you did not get any responses...
Levels and Pressures are like minimum requirements when Posting here.
LS1Tech Sponsor
Joined: Mar 2023
Posts: 1,821
Likes: 1,159
From: BERWICK PA
One other possibiliy are you sure you have full voltage to PIN E low voltage or poor PCM ground could drop low enough with TCC PWM and A solenoid on to lose one or all Just a thought . Realizing this is a 60 not 80 but I had a guy I helped once who when his 80 would shift to 4th and tcc came on it would imediatly shift to second, Voltage was low on pin e like 9.3 or something , Was a cold solider joint. Actually checked normal in 1-2-3 only went down in 4th with lockup on. Found it by driving with multimeter on pin e wire.
__________________
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Frank formerly of Performabuilt, Now just me, What can I build for you today? Call or message me. Click sig pic for my facebook
Thread Starter
Joined: Jul 2019
Posts: 116
Likes: 13
From: Indianapolis, In
One other possibiliy are you sure you have full voltage to PIN E low voltage or poor PCM ground could drop low enough with TCC PWM and A solenoid on to lose one or all Just a thought . Realizing this is a 60 not 80 but I had a guy I helped once who when his 80 would shift to 4th and tcc came on it would imediatly shift to second, Voltage was low on pin e like 9.3 or something , Was a cold solider joint. Actually checked normal in 1-2-3 only went down in 4th with lockup on. Found it by driving with multimeter on pin e wire.
Been thinking its valve body. Almost like a backwards plunger or missing spring in a circuit allowing 3 to energize. But power I read can do similar. Will get answers in a few days!
