Tech 2 Purchase

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George B

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I find your Envoy issue truely curious. In particular because I also own an 02 GMT360. Your description of what happens with the security light and unknown driver message I expect to see with a hosed serial data line. But the cluster gauges going full scale upward is bizzare. A cluster reset drives the gauges down to the max. I have never seen nor can I duplicate an upswing on my frankenstein benchtop of PCM, BCM, Cluster, Ignition switch and whatever other random modules I throw on there.

The Envoy connects with no more than 3 wires, power, ground, and serial data. If the DLC cable and obd2 adapter are sound that points to a bad VCI I would have to guess
I am leaning towards the VCI.
 

TJ Baker

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Not using AC adapter. I was originally not using any additional power. Just the OBD port power. I have been trying out using the DC adapter attached at the OBD connector end of the cable with better results. Need to take note of what works best.

Do note that there exists a difference between using the ac adapter at the DLC cable end vs using it on the tech 2 itself
 

TJ Baker

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Noted as seen here on page 35.

So here is a curious thing. Many if not all of these clones have power supply deficiencies that cause the tool to reset if the vehicle is restarted. To overcome this some, myself included, have separately powered the tech 2 using the port on the tech 2 ifself along with the cigar lighter power cable that comes with the set. I use a wholly separate power source, not the ac adapter but a battery booster jump box with aux power outlet.
 

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