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Old 11-17-2004, 06:54 PM   #1
Scooby Newbie
Member#: 74967
Join Date: Nov 2004
Default 91 Legacy OBDii ?? Engine Light

Is the 91 legacy ecu compatible with OBDii?

Or is it an earlier version of OBD? or something different?

I can get access to an OBDii reader.

If its not OBD or OBDii then what standard is it? Is there a special reader? and how do i read the diagnostic codes?

The problem with the car is that the check engine light comes on whenever i restart the car after a short break after driving for an extended period. In order to get rid of the engine light i have to turn off the engine and restart.

Any ideas??

Any help appreciated.

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Old 11-17-2004, 07:17 PM   #2
Scooby Specialist
Member#: 68120
Join Date: Aug 2004
Chapter/Region: MWSOC
Location: KANSAS!!!
1998 RS 2.0 vf23 STi


I believe it is a ODB1 system but the connector I havent found yet.

There is a self diagnostics procedure you can perform. There is a plug with 1 or 2 wires on it, black if i remember right, that is under the dash on the right hand side of the steering column. With the key off, unplug that connector, turn the ignition to the run position and the check engine light will flash a series of codes. I have a Haynes manual and it lists the codes and what they mean. You can also erase the codes, but I cant remember how.

So basically if you get a Haynes manual it talks all about it.

Hope that helps.
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Old 11-17-2004, 07:24 PM   #3
Scooby Newbie
Member#: 3224
Join Date: Dec 2000
Location: Seattle, FL


1G legacy = obd1

how to read engine codes: http://legacycentral.org/library/literature/codes.htm
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Old 11-18-2004, 08:50 AM   #4
Uncle Scotty
*** Banned ***
Member#: 16200
Join Date: Mar 2002
OK buy Nates beans


OBDII is '96(some '95's) and up.
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