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1991 GMC Sonoma Temerature sending unit

Tiny
HANNAHDAD210
  • MEMBER
  • 1991 GMC SONOMA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 220,000 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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Wednesday, August 26th, 2009 AT 10:23 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS


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



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




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




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

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Wednesday, August 26th, 2009 AT 11:27 PM
Tiny
HANNAHDAD210
  • MEMBER
  • 2 POSTS
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?
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Thursday, August 27th, 2009 AT 8:20 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The coolant temperature sensor is located on top front of engine-see item D below


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

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Thursday, August 27th, 2009 AT 10:22 AM

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