Trionic Conversion A/C integration and wire questions - SaabCentral Forums
*
Home Saab Pictures Saab Classifieds Saab Dealer Listings Saab Forum Saab Forum


Go Back   SaabCentral Forums > Saab C900, 1979-1993 & '94 Convertible (C=classic) > C900 Workshop

Notices

C900 Workshop Classic 900 (1979-1993 & '94 Convertible) Technical Forum.

SaabCentral.com is the premier Saab All Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 5 Days Ago
Saaberati's Avatar
Saaberati Saaberati is offline
New Member
 
Join Date: Feb 2019                                                
Location: Munich / Germany
My Saabs: 1993 CC
Posts: 3
Default Trionic Conversion A/C integration and wire questions

Hi,

I'm Sven from Germany and doing a T5 conversion on my '93 Lucas FPT right now. Hardware is done, Software and t7 valve mod also. Harness is nearly done, but i've a few questions.

First: i ripped of the old APC harness. But in the fuse box, there are two loose yellow/white cabels now, that are going to plug 152b and 152c to the main harness under the dashboard. I can't find, for what they are for.

Next: I want to integrate my A/C. I got a blue/white, a red/white and a grey/white cable from the AC Plug. Shall i plug them in to the Trionic ECU?
The thick grey/red and the red for the compressor is clear. Also i found a Video on YT, where someone tells, that you don't need the pressure switch with the circuit (red cable) in the water hose anymore. Is that true? Is there a function in the trionic ECU?

Ah and the BPC Valve Plug got the blue cable and usually the orange one. But my t5 harness only got the green and the blue one in it's plug. So i gorget the green one (Valve mode is done) and give the BPC Valve voltage. Wher should i take the voltage best from. Doing it with a fuse? Maybe from the main relais or the harness? I want to build a Fusebox. It should be +15, right?

And last: I want to integrate the EVAP System. I got the cables in the T5 Harness. Also the red/yellow cable from the EVAP Valve, that goes thru the firewall. And i got a grey/white one from the old Lucas Harness. Wich of them should i conect with what?

Maybe someone knows the Lucas Diagrams...

Sven
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 5 Days Ago
jvanabra jvanabra is online now
Saab Lunatic
 
Join Date: Feb 2004                                                
Location: California
My Saabs: LOTS. :)
Posts: 3,420
Default

Quote:
Originally Posted by Saaberati View Post
Hi,
First: i ripped of the old APC harness. But in the fuse box, there are two loose yellow/white cabels now, that are going to plug 152b and 152c to the main harness under the dashboard. I can't find, for what they are for.
If these are from the APC harness, I would expect they are for the pressure sensor under the dash. It tells APC the current charging pressure.

Quote:
Next: I want to integrate my A/C. I got a blue/white, a red/white and a grey/white cable from the AC Plug. Shall i plug them in to the Trionic ECU?
The thick grey/red and the red for the compressor is clear. Also i found a Video on YT, where someone tells, that you don't need the pressure switch with the circuit (red cable) in the water hose anymore. Is that true? Is there a function in the trionic ECU?
I believe there is just one wire which goes back to Trionic, but I would look at the T5 pinout & explanation at txsuite.com to be sure. The single wire tells Trionic AC is active so it can raise the idle speed. The sensor in the water hose is a temp sensor - it disables AC if the engine temperature gets too high. It was a safety system that really was never needed... by the time it interrupts the AC, the engine is already baked anyway.

Quote:
And last: I want to integrate the EVAP System. I got the cables in the T5 Harness. Also the red/yellow cable from the EVAP Valve, that goes thru the firewall. And i got a grey/white one from the old Lucas Harness. Wich of them should i conect with what?
I don't know anything about Lucas, but the evap purge valve needs switched power from somewhere, and the single wire from the T5 ECM connected. The valve is controlled by T5 pulsing the ground.
Reply With Quote Quick reply to this message
  #3  
Old 5 Days Ago
Saaberati's Avatar
Saaberati Saaberati is offline
New Member
 
Join Date: Feb 2019                                                
Location: Munich / Germany
My Saabs: 1993 CC
Posts: 3
Default

Thanks for your reply.

Quote:
Originally Posted by jvanabra View Post
I believe there is just one wire which goes back to Trionic, but I would look at the T5 pinout & explanation at txsuite.com to be sure. The single wire tells Trionic AC is active so it can raise the idle speed.
Yes, the pinout diagram of the T5 Ecu says: PIN 59 - A/C input - green/white cable and PIN 54 A/C out - white/red cable.

On the A/C Plug in my engine compartment i have a green/white that goes to the +15 distribution terminal (so it's switched?), red/white cable that goes to the A/C Relais and a blue/white one that goes to to the anti freeze thermostat inside the air housing.
Hmm, wich one goes to PIN 59 of the Ecu and what will happening with the two others?

Quote:
Originally Posted by jvanabra View Post
The sensor in the water hose is a temp sensor - it disables AC if the engine temperature gets too high. It was a safety system that really was never needed... by the time it interrupts the AC, the engine is already baked anyway.
Reply With Quote Quick reply to this message
 
  #4  
Old 5 Days Ago
Saaberati's Avatar
Saaberati Saaberati is offline
New Member
 
Join Date: Feb 2019                                                
Location: Munich / Germany
My Saabs: 1993 CC
Posts: 3
Default

Ah - could it be, that the green/white +15 ist the one from the ignition switch??(The outer right one on my screenshot).
Attached Thumbnails
Click image for larger version

Name:	Bildschirmfoto 2019-07-11 um 20.54.08.jpg
Views:	3
Size:	7.3 KB
ID:	253488  
Reply With Quote Quick reply to this message
  #5  
Old 5 Days Ago
jvanabra jvanabra is online now
Saab Lunatic
 
Join Date: Feb 2004                                                
Location: California
My Saabs: LOTS. :)
Posts: 3,420
Default

It could be. On older fuel injection, the button turns the AC on and the relay tells the fuel injection "AC is on." On modern fuel injection, the switch tells the computer to turn the AC on... I'm not sure where Trionic falls into that - my car has no AC!
Reply With Quote Quick reply to this message
  #6  
Old 5 Days Ago
peva's Avatar
peva peva is offline
Saab on the Brain!
 
Join Date: Feb 2004                                                
Location: West London UK
My Saabs: '94 T16 Ruby 3dr, '93 T16 Ruby Vert.
Posts: 8,833
Default

On the 900 there is an input to the ECU to raise the idle with AC on to cope with the extra drag.
__________________

Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the SaabCentral Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in


Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 09:19 PM.



Powered by vBulletin® Copyright ©2000 - 2019, vBulletin Solutions, Inc.

top of page | sitemap | email us



copyright © 2003 - 2011 saabcentral.com, All rights reserved http://www.whiter.co.uk - valid xhtml - valid css
SaabCentral is an independently run website and is not affiliated in any way to Saab Automobile AB.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.