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Old 12-02-2007, 10:59 PM   #6 (permalink)
gamiller
Emission Test Flunkee
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Join Date: Jun 2001
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Re: Wideband Oxygen Sensor Resources

There seems to be a discrepancy over what pins the XCal actually uses for logging analog data from an external sensor, such as a wideband. The documentation is clear enough:



Now for the image on the left to match up with the table on the right, the following diagram must correctly illustrate the pin numbering for the cable.



However, experience suggests otherwise! After confirming that I was getting 2.2V on the signal wire from my wideband, I plugged the cable into my XCal and watched in horror as brown smoke wafted out of every hole and crevice! It's time to take matters into our own hands!

With trusty multi-meter in hand, and using the mini-DIN cable as a break out for the XCal comm port, I obtained continuity, or a low-resistance connection, on each of the following pins: 1, 2, 5, 7, 8, 9.

That proves that pins 3, 4, and 6 are either open circuit (i.e. not connected to anything) or are connected to components with a resistance greater than 30 ohms. The resistance and voltage measured for each of these pins is as follows:

3 = 89k 2.5V
4 = 89k 2.5V
6 = 53k 0V

Yikes! We have live wires! I was told by SCT support that no pins other than the analog inputs were functional or even connected.
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Last edited by gamiller; 12-04-2007 at 08:12 PM.
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