Question about 2000 Mazda MX-5 Miata

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2000 Miata OBDII "What we have here is a failure to communicate"

My car passes the CA required emission test, yet fails to "handshake" with diagnostic computer and several code readers, including mine. PIN 16 is hot with 12VDC. The Check Engine light was not on at first, but now it is on. This has been going on for over a year. I have checked all fuses on the panel under the hood, and next to the ODB II plug. They have always been fine. Now what? The car wouldn't pass emission testing if the computer wasn't working, right?

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emissionwiz
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SOURCE: mazda miata computer not comminicating to obdII

You likely just have a blown fuse at the diagnostic connector, check to see that you have 12 volts at pin 16 on the connector. See diagram of pin below.
10_2_2012_8_41_02_pm.jpg

Posted on Oct 02, 2012

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10_2_2012_8_41_02_pm.jpg

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