Mechanics

TEMERATURE SENDING UNIT

1991 GMC Sonoma

Electrical problem
1991 GMC Sonoma 6 cyl Two Wheel Drive Automatic 220000 miles

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.
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Hannahdad210
August 26, 2009.





http://www.2carpros.com/forum/automotive_pictures/12900_cts1_5.jpg



http://www.2carpros.com/forum/automotive_pictures/12900_cts2_1.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_cts3_1.jpg




http://www.2carpros.com/forum/automotive_pictures/12900_cts4_1.jpg

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Tiny
Rasmataz
Aug 26, 2009.
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?

Tiny
Hannahdad210
Aug 27, 2009.
The coolant temperature sensor is located on top front of engine-see item D below


http://www.2carpros.com/forum/automotive_pictures/12900_cts_28.jpg


Tiny
Rasmataz
Aug 27, 2009.

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