proper way to test data wires

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chev104275

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Joined: November 26, 2007

Location: Massachusetts, United States

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

Member - Posts: 27

Joined: August 25, 2009

Location: Ohio, United States

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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Joined: April 14, 2005

Location: Ohio, United States

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

Copper - Posts: 64

Joined: September 30, 2003

Location: United States

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

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

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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Joined: November 26, 2007

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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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Joined: April 14, 2005

Location: Ohio, United States

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

Copper - Posts: 285

Joined: August 05, 2007

Location: Michigan, United States

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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