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  #21  
Old 06-22-2014, 05:01 PM
Witsend Witsend is offline
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Witsend Made it to level 2!  Looks like you are on your way to becoming famous

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Just happy I figured out how to view a wheel sensor trace if I can't read one on scanner. I never really actually saw any particular drop out and the printout really wasn't conclusive, the printer paper feed momentarily stuck and I just placed a couple dots at the top of the broken sine wave to make a face for a little humor. Why it did not print the last 2 or three humps of the trace , I haven't a clue. The harness and connectors looked fine to me so I just tossed a cheap $70 hub at it .
The Lab scope choice on menu has not worked for me on the two things i tried with it so far , but the work around to be able to see a pattern with the optional low amp probe was selecting vacuum waveform that worked to see a decent fuel pump pattern and selecting alternator waveform worked to see a decent speed sensor pattern.
For all I know the code for the right rear wheel speed sensor could have been generated weeks ago , but the idiot light on that the customer wanted fixed was the service engine soon light for the evap code
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  #22  
Old 06-22-2014, 08:13 PM
Crusty Crusty is offline
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Well you got the EVAP code figured out-!! Good news-!!

As for the cheap-Azz $70.00 hub, up here in Canuck land they're $140.00 and decent ones are in the 250 to 500 banana range depending on vehicle. People don't like doing them twice...LOL

Try going back to the basic scope settings and play with the TPS sensor and get a signal of some kind. Then it's just a matter of playing with the time base and the amplitude of your scope settings. The fact that the alternator ripple setting is an AC setting and the wheel speed sensor is also an AC signal may help you figure that out
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