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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

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  Jim Grant's Tech Tips

’91 Geo Strom, Where’s the Diagnostic Connection?

Q: I own a ‘91 Geo Storm and can’t fine where to plug in the code reader. Could you tell where it is or if it has one? …

Henry

A: Your ’91 Geo Strom has a diagnostic connector, but it is not the type that a code reader for the newer vehicles can be plugged into. You’ll need a manufacturer type scan tool or an after market tool with the appropriate adaptor. You can also flash the codes on this vehicle. On the passenger side of the dash, just to the right of the glove box and tucked up behind the lower dash panel, are three diagnostic connectors. One will be green with 5 cavities. This one is for the automatic transmission’s computer if equipped. There will be two 3 cavity connectors. One will be orange for the air bag system and the remaining 3 cavity connector should be white. The white connector is the one used for flashing codes from the engine computer. To get the computer to tell what codes are present you have to turn the ignition on (not running) and ground the # 3 terminal in the white connector. This will cause the computer to flash the diagnostic trouble codes via the check engine light

 
     
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