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four wheel drive not working

2004 CHEVROLET S-10
131,000 MILES
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FMC627
  • MEMBER
  • 1 POST
mechanic says when he hooks up his diagnostic tool, it says there is no communication with the 4wd computer. The lights on the switch don't light up and 4wd does not engage. I have had this problem ever since the truck came back from the transmission shop.
Nov 14, 2011 at 1:17 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Check the wiring to the actuator on the transfer case. See if there is power to it. If there is, remove the actuator and check it for operation. If no power, work back to the relay and switch to see where power is lost.
Nov 14, 2011 at 3:38 PM
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