Jim Grant's Tech Tips
Geo Strom, Where’s the Diagnostic Connection?
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? …
’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