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How can you test the data link to see if it's working? Since my Quad MMM feels like it's not working I'm thinking that the data link might not be sending any info.
 

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I know there was a way they showed us at school for GM using your voltmeter. You had to put the meter in line with the data connectors and it would read 2.5 or 5 volts.....something like that, I can't really remember, but I know there was a way if you did not have a scan tool.
 
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