1991 GMC Sonoma Temerature sending unit

1991 GMC SONOMA
220,000 MILES • 6 CYL • 2WD • AUTOMATIC
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HANNAHDAD210
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I have a 1991 GMC Sonoma 4.3L The truck is hard to start of the morning. after about 15 sec run time, the truck begins to flood/ses light comes on. I get a code 14 Temp Sensor high curcuit. I can't find the computer pin to bypass to from sensor. new sensor, tune up. Thank you for your time.
Aug 26, 2009 at 10:23 PM
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RASMATAZ
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Aug 26, 2009 at 11:27 PM
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HANNAHDAD210
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I scanned the truck with a Genisys Pro and with the engine off, Key on, the Genisys shows the coolant temp at 390*, also which sensor controls the ecm, the single wire on the side of the block or the two wire by the thermostat?
Aug 27, 2009 at 8:20 AM
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RASMATAZ
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The coolant temperature sensor is located on top front of engine-see item D below


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Aug 27, 2009 at 10:22 AM
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