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No, the '89 is still the renix based control unit. Commonly available scanners will not work with a renix system since it stores no codes. I have heard that dealerships used to have some sort of scan tool that worked on renix based motors, but I've yet to hear of anyone who actually has such a tool nowadays.
Renix systems are generally investigated using a volt meter to read the input/output voltages of various sensors and comparing these readings against known "proper" voltages. If a voltage reading is off, the sensor needs replacing.
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http://www.instant-radio-code.co.uk/chrysler-jeep-code-search.php
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