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  #1  
Old 22nd January 2016
chunker941 chunker941 is offline
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Default Tech 2 reboots when engine is started

Is it possible to start the car andnot lose connectivity to the tech 2?
It seems that some of the functions require "start engine".
Thanks
Bill
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  #2  
Old 22nd January 2016
ride5000 ride5000 is offline
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bill, are you powering the tech2 from the vehicle via the cigarette plug?
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  #3  
Old 22nd January 2016
chunker941 chunker941 is offline
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No, from the obd connection.
Thanks for the reply
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  #4  
Old 22nd January 2016
ride5000 ride5000 is offline
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i would try to power the tech2 via some other method (batteries, line power adapter, etc) just to make sure it's not car related.
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  #5  
Old 22nd January 2016
fishzine fishzine is offline
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It is annoying to deal with the reboots, but really the ODB port is the best way to power your Tech2. Removes any ground loop issues that can cause data loss. Especially if you are doing programming, probably OK if you are just reading values and such
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  #6  
Old 22nd January 2016
#40Fan #40Fan is offline
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External power won't help. It will still reboot.
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  #7  
Old 23rd January 2016
CJPeterborough CJPeterborough is offline
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Normal behaviour with standard clone unit I'm afraid.

There are some modifications that can be made - for example chnaging the voltage regulator in the VCI along with converting from RJ45/RS232 to USB.

These require some electronics skills and the ability to interpret russian forums.

http://diy-tech2.blogspot.nl/2014/07...l?view=sidebar
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  #8  
Old 23rd January 2016
chunker941 chunker941 is offline
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Thanks guys, I think I'll persevere for now lest I screw everything up.
Thanks again everyone.
Bill
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  #9  
Old 12th March 2016
el.patron el.patron is offline
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Default LM2596S based voltage converter

Hi there,
I replaced the voltage regulator with a LM2596S-based regulator you find tons of at ebay. These regulators have some advantages:
- very low margin needed, so the regulator works down to 6,xx Volts and Tech2 survives engine start on my car.
- the LM2596 has an On/Off-pin, to get the same behavior as the original tech2 to power on and off with the power button. Unfortunately the high/low-logic is inverse, so that I had to add a transistor (BC547) and two resistors (4.7k and 1 kOhm) to integrate it correctly. The pin 5 of the regulator had to be lifted from the board to solder a wire to it.

Enclosed find some pictures. The regulator is sticked to the board with some very adhesive double sided adhesive tape... and trimmed to 5V before
Works very fine.
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Last edited by el.patron; 28th March 2016 at 01:46 PM.
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  #10  
Old 12th March 2016
chunker941 chunker941 is offline
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I'm a little bit ham handed to tackle the mod, it looks like a pretty simple operation though.
Danka
Bill
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  #11  
Old 12th March 2016
#40Fan #40Fan is offline
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Looks good. Parts ordered to fix mine up.
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  #12  
Old 21st March 2016
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Quote:
Originally Posted by el.patron View Post
and trimmed to 5V before
Works very fine.
What exactly did you do to accomplish this?
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  #13  
Old 22nd March 2016
el.patron el.patron is offline
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Default trim 5V

I struggled also a bit with that. I had to turn the brass screw on the trim poti maybe 10-20 times counterclockwise to bring the poti to a working range. At start just screwing half turn left or right changed nothing.
Good luck!
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  #14  
Old 22nd March 2016
#40Fan #40Fan is offline
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Did you use an external power supply?
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  #15  
Old 22nd March 2016
el.patron el.patron is offline
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Yes, I used an external power supply, and checked the output voltage with a multimeter. But you could also use the power supply provided with the Tech2.
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  #16  
Old 27th March 2016
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Quote:
Originally Posted by CJPeterborough View Post
Normal behaviour with standard clone unit I'm afraid.

There are some modifications that can be made - for example chnaging the voltage regulator in the VCI along with converting from RJ45/RS232 to USB.

These require some electronics skills and the ability to interpret russian forums.

http://diy-tech2.blogspot.nl/2014/07...l?view=sidebar
So you're saying a bonafide Tech2 won't reboot during start up (ie: will stay on running whatever mode you started with) while attached to the obdII port?

The rebooting issue with a clone Tech2 is because of NQR (not quite right) parts in the VCI?

Otherwise my clone works fine--seems a bit risky to mess with it--especially while I'm still under warranty...
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  #17  
Old 28th March 2016
el.patron el.patron is offline
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Quote:
Originally Posted by Banman View Post
So you're saying a bonafide Tech2 won't reboot during start up (ie: will stay on running whatever mode you started with) while attached to the obdII port?

The rebooting issue with a clone Tech2 is because of NQR (not quite right) parts in the VCI?

Otherwise my clone works fine--seems a bit risky to mess with it--especially while I'm still under warranty...
An original Tech2 under normal battery conditions does not reboot during engine start. This is related to the voltage regulator on board and the margin it needs to maintain 5V output to the Tech2 board. The original voltage regulator can keep this voltage with a dropped battery voltage down to 7V or even lower.
This is not related to the VCI hardware.

Last edited by el.patron; 28th March 2016 at 01:47 PM.
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  #18  
Old 28th March 2016
#40Fan #40Fan is offline
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I thought I had a stack of 4.7 OHM resistors to get this mod done this weekend, only to find out I didn't. 47, 4.7K, but no 4.7.

I have had a couple GM vehicles that didn't cause my clone to reboot when started.

Last edited by #40Fan; 28th March 2016 at 12:08 PM.
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  #19  
Old 28th March 2016
el.patron el.patron is offline
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Quote:
Originally Posted by #40Fan View Post
I thought I had a stack of 4.7 OHM resistors to get this mod done this weekend, only to find out I didn't. 47, 4.7K, but no 4.7.
Good that you replied. I meant 4.7 kOhm and 1 kOhm, but I am quite sure that both 1kOhm will also work.
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  #20  
Old 28th March 2016
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So if cranking voltage stayed high enough, even a clone would not experience enough voltage drop to go into a re-boot mode?

I'm smart enough to fix helicopters, but not near smart enough to trust myself reading and interpolating Russian language or schematics.

Is the necessary mod documented anywhere in English...?
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