Can not get a reading on the diagnostic machine. Why?

1993 LEXUS SC 400
69,000 MILES
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JOHNSIKORSKI
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  • 7 POSTS
I have a Lexus SC400 1993. I have a diagnostic and when I plug it in to the system it say cannot read. I bought a tester light and it has power going to it. Why will it not read the diagnostic machine? ALso it will start, but it acts like it want to die out and the RPM are going up with out putting my foot on the gas peddle. After the car sits for a while it will start and run until it reached a certain temputure and then goes blog. The engine light also on. Can you help me?
Oct 1, 2012 at 3:19 PM
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SATURNTECH9
  • ✓ASE Certified Mechanic
  • 30,869 POSTS
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Which tester did you buy?
Oct 1, 2012 at 3:21 PM
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JOHNSIKORSKI
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  • 7 POSTS
Innova 1203- CANOBDI
Oct 1, 2012 at 5:15 PM
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