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Old 01-18-2010, 01:40 PM   #3
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,621
Re: Engine light on @ idle

Here are some web sites with the basics on retrieving codes from the ECM without a scan tool or code reader.

Poor drawing of ALDL/DLC but ok instruction + codes
http://www.cfm-tech.com/gm_tbi_trouble_codes.htm

OBD1 terminal identification
http://robertpowersmotorsports.frees.../ALDL_plug.jpg

OBD1 illustration and instructions
http://www.troublecodes.net/GM/
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