FIX: Tech 2 reboots if engine started

Mooseman

Moderator
Anybody else have this issue? If you have the Tech 2 plugged into the OBD port and start the engine, it shuts down and reboots. Doesn't matter if I use an external power source (AC or seperate battery) and I confirmed it's not using the OBD port's power.
 

littleblazer

Gold Supporter
Mine does it as well. Never figured it out.
 

Sir ffeJ

Well-Known Member
I heard clone Tech 2's do this.
 

littleblazer

Gold Supporter
I don't remember but I think if I use the ac adapter it doesn't shut off.
 
OP
OP
Mooseman

Mooseman

Moderator
Did some reading and according to this, it can apparently be done by disabling pin 16 in the OBD port and using an external 12V power source. Maybe pulling the relevant fuse might also work. I'll have to give this a try as I am not up to taking my Tech 2 apart.
 

littleblazer

Gold Supporter
Mine won't power up from just the obd port anymore... it self moded lol.
 
OP
OP
Mooseman

Mooseman

Moderator
Thanks to @Sir ffeJ , I did some research in those links and I can confirm that if you pull the fuse that supplies 12V to the OBD port (fuse 13 LTR under hood for GMT 360's), you can start the engine and it won't reboot. Here are the steps:

  • pull the fuse that supplies power to the OBD port
  • plug the Tech 2's connector to the OBD port
  • using either the AC adapter or 12V battery clip adapter, connect the round power plug into the round power hole in the wire connector near the CANdi unit
  • power up the Tech 2 as usual and conduct your tests.
  • After disconnecting the Tech 2, don't forget to replace the fuse

Do not use the power plug in the Tech 2 itself. I tried that one and the CANdi unit wouldn't power up. Using the one in the cable connector fixes that. I used a mini engine start booster with the clips.
 
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OP
Mooseman

Mooseman

Moderator
Final fix for this so you don't have to hunt for the fuse. I bought an OBD extension cable and added a switch to the pin 16 wire. Using an external power supply to the Tech 2 using the plug hole on the cable near the CANdi unit, it works flawlessly.

Funny thing though, with the external power connected (I used a lithium booster pack), it worked perfectly whether the switch was on or off, as if using the external power plug cuts off the OBD vehicle power. It's funny because it didn't work before. Oh well, either way, I have the switch.
 

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