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Your Engine and emission diagnostics manual will guide step by step through just about any problem using the box. The manual will give you all the readings you need.
You might make an overlay showing you what pins are in use for the Truck/Car you have it hook to.
There is alot that you can't do without a breakout box....such as checking for continuety (<-spelling?) of the wiring harness one wire at a time, from one end of the wire to the other to find shorts and openings within the harness.
Well, I suppose you CAN, but you will have to damage the insulation of the wire and it could be very difficult to do depending on what you are working on.
You CAN NOT probe the 60 pin connector without damaging it. The box allows you to probe at the computor...EASILY...without damaging anything.
On top of that, some things arn't so easy to back probe. With the box it's a piece of cake. And the box only takes a few munites to install. You also remove the chance of damaging the electrical plugs for the sensors etc.
As far as the price, alot has changed since 1997. It now costs roughly 700 dollars new depending where you go. If you buy online, it gets cheaper.
I paid 165 dollars for a new one. Thats eBay for you!