Hacking the Saturn Cruise Control ... - Page 4 - Fuelly Forums

Click here to see important news regarding the aCar App

Go Back   Fuelly Forums > Tech, Troubleshooting and Repair > General Maintenance and Repair
Today's Posts Search Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 07-03-2008, 10:22 AM   #31
Registered Member
 
HotRod205's Avatar
 
Join Date: Jul 2008
Posts: 2
Country: United States
I have an idea. I know that some ECM/PCM programming systems let techs turn on or off settings for diagnostics, I have seen this done on forums for other makes/models. The problem is finding a cooperative tech at a dealership willing to give it a shot.

The problem seems to boil down to this:
Since the MPH & RPM don't match the ECM thinks the clutch is slipping and disengages the cruise control.

There are two possible ECM fixes:
1) Change the ECM MPH/RPM table to match the SL1/MP2 value for 5th.
2) Disable the "clutch slip disengage" logic entirely.

If there was an option for a tech to disable the clutch slip action that would work, other than the clutch cruise cutoff but you have the fix for that here.

The "elephant-in-the-room" is exactly what can or can't be done with the flash programming. I may be able to get an answer. I just happen to know a service tech who is now working at a Saturn dealer. I'm going to talk to him and get him to find out how much he can do with the ECM flash programming on an SL. If he can change either the 5th ratio in the programming or disable the clutch-slip-cutoff then we will have the specifics to be able to go to a dealer and say "re-flash mine with XXX changes", pay their fee (should be reasonable), and have this whole problem solved. This may take a few weeks to find out, so check back.
__________________

__________________
2002 Saturn SL2, 5 speed
HotRod205 is offline   Reply With Quote
Old 07-03-2008, 05:56 PM   #32
Registered Member
 
Join Date: Apr 2006
Posts: 183
Country: United States
Quote:
Originally Posted by skewbe View Post
Wait one dang minute, are you telling me that there is a seperate module for the cruise? And I just need to fake out that light blue wire?!? Dang, why didn't you say so sooner

history, since my trans swap, the gear ratios in the transmission do not match what the computer is expecting, so the cruise control thinks the clutch is slipping and it won't engage. Saturns have some peculiarities to them, But I still like 'em
You might check and see if the DOHC uses the exact same p/n cruise control module as the SOHC. If not, maybe you could get an SOHC one at a junk yard.
__________________

cheapybob is offline   Reply With Quote
Old 08-15-2008, 05:51 AM   #33
Registered Member
 
Join Date: Aug 2008
Posts: 1
Country: United States
CarlosSW2 or HardRod205,

Any update on a programming or wiring fix for the Saturn Cruise Control hack?

I would love to switch to a taller gear, but I still want to keep cruise.

IYAAYAS
IYAAYAS is offline   Reply With Quote
Old 08-17-2008, 12:23 PM   #34
Registered Member
 
95slowone's Avatar
 
Join Date: Aug 2008
Posts: 5
Country: United States
i threw out my automatic and installed a manual trans out of a dohc car ( i have a sohc) my cruise still works.
yes, these cars are cruise ready. there are instructions on www.saturnseries.net
all pcms have the capability to do this.
this may be different for late 99-01 s series cars as those have a bcm.
__________________

95slowone is offline   Reply With Quote
Old 06-25-2013, 10:04 AM   #35
Registered Member
 
HotRod205's Avatar
 
Join Date: Jul 2008
Posts: 2
Country: United States
Resurrecting a long quiet post, sorry, haven't been on here since... 2008! A lot has happened over those years, but my SL2 is still going strong with 252,000+ miles now. I've worked at home for the past two years so mileage concerns went out the window.

SL info and parts have become more scarce, still haven't been able to confirm if the 99-02 SLs have a separate cruise module or not. I think they don't, pretty certain that it is all in the PCM/BCM so would require someone with the factory service computer to flash. I haven't been to Pull-A-Part in a while, but want to go soon. I'm going to try to find a 2000-2002 SL1 manual with cruise to get one from... wish me luck.
__________________
2002 Saturn SL2, 5 speed
HotRod205 is offline   Reply With Quote
Old 06-25-2013, 11:25 AM   #36
Site Team / Moderator
 
Jay2TheRescue's Avatar
 
Join Date: Sep 2008
Location: Northern Virginia
Posts: 4,739
Country: United States
Location: Northern Virginia
Welcome back! Keep us posted on your progress!
__________________








Jay2TheRescue is offline   Reply With Quote
Old 11-23-2013, 09:05 AM   #37
Registered Member
 
Join Date: Nov 2013
Posts: 4
Country: United States
What is the purpose/function of the "RASC IN" circuit fr the CC switch to the PCM? Does it have something to do w/ PCM recognizing the cruise option? Thanks.
__________________

djjsc is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
More chart options gt1 Fuelly Web Support and Community News 1 04-12-2011 05:58 AM
Average fuel mileage line in the history graph? BDC Fuelly Web Support and Community News 1 05-06-2009 01:07 AM
Comparison of Gas vs electric zpiloto Electric and Solar powered 21 04-18-2007 07:09 PM
Honda named 2007 Greenest Automaker Matt Timion General Discussion (Off-Topic) 11 04-05-2007 08:36 PM
speculate: Will a fixed IACV help gas mileage? SVOboy General Fuel Topics 8 04-09-2006 12:49 PM

» Fuelly Android Apps
No Threads to Display.
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.