How does manual work on 4l80e?
How does manual work on 4l80e? m sick of waiting for Holley to figure out the issue Im having so Id like to diagnose the issue myself if i can. Here is what is happening. I had/have a Jakes 4l80e Manual box ive used for years perfectly. I got the holley setup last year and this year decided Id like holley to control the trans when cruising then just flip a switch and run full manual when i race. So when I flip the switch I have a gear select on my dash I can see it says its in 4th gear when im in drive. I can shift 1-3 no problem but wont go back into 4th unless i put it in neutral then back to 4th. Very odd. So im just trying to understand how me manually shifting the car sends the signal to shift the solenoid. I verified that its not a shift linkage issue by putting my Jakes box back on and it works perfect. Any help here is appreciated.
TECH Regular
Joined: Sep 2011
Posts: 431
Likes: 1
From: Washington
Just thinking here. There is the pressure switch manifold inside bolted to the valve body. Does Holley include a truth chart for each gear? I can link you to an ms chart if you'd like, it would be all the same. This way you can see as the gears change what pins have voltage and which don't. Maybe in Manual mode it's not pressureint correctly till after you bring it to neutral. What happens if you leave it in auto mode and cruise in D, then upshift to OD?
Never tried to cruise in D then upshift to overdrive when in automatic mode can try that tomorrow. As far as holley tune not sure what a truth chart means, (wire diagram??)
http://documents.holley.com/techlibr...10555rev15.pdf
page 40
http://documents.holley.com/techlibr...10555rev15.pdf
page 40
TECH Regular
Joined: Sep 2011
Posts: 431
Likes: 1
From: Washington
The truth chart shows what the pressure manifold should be doing on each pin
I'll find it really quick
Here you go. Page 24 shows what each of the 3 pins from the pressure manifold should have. These pins wire directly to the ecu so there in the harness
http://www.msextra.com/doc/pdf/Trans_Control-1.0.pdf
I'll find it really quick
Here you go. Page 24 shows what each of the 3 pins from the pressure manifold should have. These pins wire directly to the ecu so there in the harness
http://www.msextra.com/doc/pdf/Trans_Control-1.0.pdf
Last edited by Nathaninwa; May 13, 2017 at 10:13 PM.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo TECH Regular
Joined: Sep 2011
Posts: 431
Likes: 1
From: Washington
All the solenoids have to work the same regardless of the ecu. Make sure the pressure manifold pins abc are doing what there told and the solenoid outputs are switch too. It might be in manual mode that the pressure manifold is switching to the ecu, but the Holley is not commanding the upshift
Again, is manual mode maybe intended for race purpose only? And it locks you out of overdrive maybe?
Again, is manual mode maybe intended for race purpose only? And it locks you out of overdrive maybe?
Last edited by Nathaninwa; May 14, 2017 at 10:44 AM.
All the solenoids have to work the same regardless of the ecu. Make sure the pressure manifold pins abc are doing what there told and the solenoid outputs are switch too. It might be in manual mode that the pressure manifold is switching to the ecu, but the Holley is not commanding the upshift
Again, is manual mode maybe intended for race purpose only? And it locks you out of overdrive maybe?
Again, is manual mode maybe intended for race purpose only? And it locks you out of overdrive maybe?
TECH Regular
Joined: Sep 2011
Posts: 431
Likes: 1
From: Washington
That is strange. I'm not familiar with the Holley but my microsquirt has auto mode, manual mode so we can do a proper second gear into high gear burn out, paddle shift mode and a tps switched race mode which ignores the upshift tables and reverts to an rpm based upshift