Question about 1994 GMC Sierra
Need an OBD1 scanner,not OBD2 ,and hook to under dash connector
The Cadillac was the only one you could jump two pins, and read off the fuel display
Posted on May 01, 2010
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Posted on Jan 02, 2017
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Sep 16, 2012 | Cars & Trucks
Jul 14, 2011 | 1994 GMC Jimmy
The service engine soon (yellow light) comes only when the computer control unit (called the PCM) senses a fault in the electronic controls of the engine and/or the emission system u will seldom feel the car engine run any different, there are about 200 possible faults that turn the light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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