Thread: computer codes
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Old 06-16-2005, 06:08 PM   #1
Bob62
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Join Date: Jun 2005
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computer codes

I need some assistance with my 94 transport. Check engine light is on. Checked it with my ez-scan, and got 2 codes. QDM1 and QDM4. I know that this means quad driver module, but on this OBD-1 system, how can I determine which sensors or whatever is malfunctioning? Any help is appreciated.
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