OBD2 Scanner Recommendation?

[MacGyver]

With my truck's oil pressure jumping like it did, I'm looking for a good OBD2 scanner to check it out. Preferably PC based.

[Seafordguy]

Auto Enginuity??

[MacGyver]

I was told Autozone will do a free scan. I'm gonna stop there and see if their handheld code reader can even see my oil pressure. Worth a shot I guess.

[fixxxer22]

what year, make, model and engine do you have? you may not have a pcm based oil presure input to the truck. it may just be a switch style with a dummy gauge.

[MacGyver]

what year, make, model and engine do you have? you may not have a pcm based oil presure input to the truck. it may just be a switch style with a dummy gauge.

1999 Chevy Silverado 4X4 5.3L

[MacGyver]

Looking at the wiring diagram at Autozone.com, the gauge looks analog, but is monitored by the "logic".

[fixxxer22]

Logic (in a ford ) means it goes through a processor. Logic takes the input and smooths it out. so when you are at idle and at a stop light the pressure in the engine may go down to about 20 or so but the gauge should attempt to stay the same. It is just a buffer to keep things like the fuel gauge from moving back and forth when the vehicle goes over bumps and the fuel is sloshing around.

[MacGyver]

In the diagram, it looks like solid wire from the sending unit to the gauge and the logic connection is there just to monitor the sending unit and report a loss of pressure to the ECU. But then again, I have no clue!

[MacGyver]

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