remote start fails on cold mornings
Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=140636
Printed Date: May 01, 2024 at 12:28 PM
Topic: remote start fails on cold mornings
Posted By: 7808
Subject: remote start fails on cold mornings
Date Posted: January 12, 2016 at 1:37 PM
Since the weather has been getting below 15 degrees here, my truck usually wont start in the morning. Seems to only crank for a short period or starts and shuts right off. Later in the day even when its still cold it starts normal. It has gm one touch start so im not sure why it wouldnt fully crank. Its a 04 trailblazer with a compustar one way (cm800?) and a idatalink al-ca. What could cause this? Module flashed wrong? Use of t taps? ( the data wire is soldered at the obd wire)
Replies:
Posted By: rs specialist
Date Posted: January 13, 2016 at 4:41 PM
Sounds like a tach setting to me. You may need to reprogram tach.
Posted By: howie ll
Date Posted: January 14, 2016 at 10:07 AM
Run the vehicle at around 1100 RPM and then program tach.
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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.
Posted By: kreg357
Date Posted: January 14, 2016 at 8:09 PM
If you have a CM800-s remote start unit and it is mis-behaving in Tach Mode, why not try switching to Assumed Timed Crank. This option sends a 3 second crank output and assumes the vehicle started. It is designed for vehicles that have built in anti-grind and use the ECM to control the crank time. It is option 2-04. Here is a link to the full install guide for more info : https://techfeed.compustar.com/ft_controllers/manuals/CM800_Full_Install_V1.1_EN.pdf------------- Soldering is fun!
Posted By: 7808
Date Posted: January 18, 2016 at 5:24 PM
it actually starts, it just shuts off right away. (had to witness it a few more times) it makes me cringe because thats pretty much the worst thing you can do to a cold engine in below zero temps
Posted By: i am an idiot
Date Posted: January 18, 2016 at 7:37 PM
That is what they do when they lose tach programming.
Posted By: 7808
Date Posted: January 19, 2016 at 3:47 PM
I will program it, but i never programmed it or hooked up a tach wire because from what i could tell the idatalink handles it via data buss, and it starts fine most the time just not cold mornings
Posted By: kreg357
Date Posted: January 19, 2016 at 6:13 PM
Think I remember a mention from another Forum member that the ADS DL GM1 firmware sometimes drops the Tach
signal.* If your Tailblazer has "one-touch" starting and it will always start on cold mornings with the key and a quick turn
to START and release, I think I would program the CM800-s Feature 2-04 Engine Sensing to Option IV = 3.0 sec
Crank and let the Trailblazers ECM handle the rest. The CM800-s will assume the engine started, not monitor the
Tach signal, and keep the ignition wires powered for the 15 minute run time. Worth a try.
If you want to stay in Data Tach Mode, you might have to re-program the iDatalink bypass to the Trailblazer again and
then do the Compustar Tach Learn.
* See RacerJames' post in this Pictorial on a Yukon install using an ADS AL-CA w/ DL GM1 firmware.
https://www.the12volt.com/installbay/forum_posts.asp?tid=133000 ------------- Soldering is fun!
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