can a scanner show sensor output, ohms?

[oldskwl88]

Im having trouble with my egr temp diagnostic switch. I know definately a camaro issue. It fell apart and i soldered it back togeather. Gm no longer carries the part as well as anybody else. I even went as far as to try and contact gm and ask for the engineering specs (im a machinist) and no response. I was hoping a scanner would show its operating perameters or the value of temp vs the resistance change. If have to modify it i will but this car is almost completely rebiult and i want it right. Not just sometimes. Always. So if anyone has any experiance with this type of eqiupment your knowledge will be greatly appreciated. Thanks guys.

[Pantera61]

No, but you can get the voltage and we could probably figure it out.

This is how you can test it to see if it's working:
http://chevythunder.com/fuel%20injec...temp%20sw..htm

Also, I found this at TGO just now and it is basically your problem, but they have many pages of people trying to find where to get them.
http://www.thirdgen.org/techboard/tp...ensor-has.html

[kd5icr]

I would need more info. Do you have a trouble code? If so what? But here are a few things you can try.

If you have a:
Code 32. That would mean that the EGR diagnostic switch was not detected closed under the following conditions: Coolant temperature greater than 80 C (176 F). EGR duty cycle commanded by the ECM is greater than 50%.
Manifold pressure less than 25 kPa, (7" vacuum).

All conditions above must be met for about 8 seconds.A Scantool can be used to check the diagnostic switch circuit. The Scantool should display "on" when vacuum is applied to the diagnostic switch. The switch should also be indicated as being closed whenever the ECM is commanding an EGR duty cycle of greater than 50%. EGR duty cycle can also be monitored by a Scantool.


Before using this test, check for ported vacuum to EGR solenoid, also check hoses for leaks or restrictions. There should be at least 7"hg vacuum at 2000 rpm. Disconnect EGR solenoid vacuum harness. Rotate harness and reinstall only the EGR valve side. Ignition on, engine stopped. Install a hand held vacuum pump with gauge to mainfold side of EGR solenoid. Apply vacuum and observe EGR valve, the valve should not move.

[Chezoom]

^^^your post answered every question. good job