fan wires - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kglowacky · 07-16-2020, 04:13 PM

Started my LS2 today for the first time.

Motor ran well for about ten minutes then it shut off.. heres what s is happening. The fans (neither one) will will turn on. Then after about 10 minutes the pcm shuts off the relay to the fuel pump. I think the problems are related. My question is is the fan wires from the pcm hot wires when they get the signal from the pcm and therefore act as the positve side of the relay or are they the negative side of the relay? I think the pcm reads a hot engine and shuts off the fuel??? Help your thoughts

07-16-2020, 04:13 PM	#1
kglowacky Registered User Join Date: Mar 2020 Location: The Woodlands,Tx Posts: 562	fan wires Started my LS2 today for the first time. Motor ran well for about ten minutes then it shut off.. heres what s is happening. The fans (neither one) will will turn on. Then after about 10 minutes the pcm shuts off the relay to the fuel pump. I think the problems are related. My question is is the fan wires from the pcm hot wires when they get the signal from the pcm and therefore act as the positve side of the relay or are they the negative side of the relay? I think the pcm reads a hot engine and shuts off the fuel??? Help your thoughts



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