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proper way to test data wires


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chev104275 
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Posted: December 13, 2010 at 6:17 PM / IP Logged  
As the title states. What is the best/proper way to test data wires ? CanH and CanL
If i Can't Install it    I Don't need it   Joe
cjanke 
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Posted: December 13, 2010 at 6:47 PM / IP Logged  
IDK . Maybe an o-scope. I guess we just have to trust the bypass manufacturers in the instruction manuals.
chev104275 
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Posted: December 13, 2010 at 6:57 PM / IP Logged  
That's what I've been doing. Trusting the pinout charts. But my work is starting to get me more data modules so I would just like to know how to test the wires so I know they are the right ones.    Data modules are sooooo much eaiser. I've been doing everything wired
If i Can't Install it    I Don't need it   Joe
KPierson 
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Posted: December 13, 2010 at 8:21 PM / IP Logged  
The only surefire way is with an oscilloscope.
Kevin Pierson
chev104275 
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Posted: December 13, 2010 at 8:31 PM / IP Logged  
Ok. Thanks I'll just have to trust the pinout sheets that comes with the modules. It's been good so far.   Just hate connecting wires without verifying first
If i Can't Install it    I Don't need it   Joe
ayalja123 
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Posted: December 13, 2010 at 8:35 PM / IP Logged  
Yes,  they are some much easier. I remember doing passlock systems and having to find the right resistor value. Now you just find that data wire and you got tach,doors, trunk.....etc. New guys don't know how easy we have it now. But back to your subject I would also like to find out how to test for them.
howie ll 
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Posted: December 14, 2010 at 12:34 AM / IP Logged  
You CAN (I had to didn't I) test with a good quality high impedance DMM (Fluke etc.), but you need to know the values, I'd stick with a scope myself.
chev104275 
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Posted: December 14, 2010 at 5:30 AM / IP Logged  
Ok I have a dmm not sure if its high impedence or not its made by BK test bench model 388A and access to a scope. What am I looking for with each one ?
If i Can't Install it    I Don't need it   Joe
KPierson 
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Posted: December 14, 2010 at 10:15 AM / IP Logged  

With your scope you should see square wave type data.  You, obviously, won't be able to understand what the data is saying, but you should see data on the line.

It should be just random patterns of highs and lows.

__--___--__--------____---___-----_____--------------______----______

Kevin Pierson
awdeclipse 
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Posted: December 14, 2010 at 11:04 AM / IP Logged  
How about tracing them back to the OBDII connector? Do a continuity check between where you are grabbing the data wires and where they are already known. A quick Google image search will turn up some pictures for you if necessary.
PIN6 - CAN High
PIN14 - CAN Low
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