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HEGO problems

  #1  
Old 11-08-2018, 08:24 PM
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HEGO problems

Hey everyone, been awhile since my last visit. Been struggling to get rid of my hego not switching code. I replaced it last week, but am not entirely sure that the plug is pinned correctly. The sensor has 4 wires, black, grey, and 2 white. the vehicle side is blk, ground, grey/yellow, hot in run, grey/lt. blue, pin 29 at ECM, orange to pin49 at ECM. I'm not sure how to check the sensor to figure which wire goes to what. I have even tied finding another truck to compare it to, no luck yet.
 
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Old 11-15-2018, 03:18 PM
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DOES THIS HELP
 
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Old 11-15-2018, 10:20 PM
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Originally Posted by Redark1 View Post






DOES THIS HELP
That's one half of the problem. I am going to chase the orange and gray/yellow back to EEC, make sure I have continuity. How would I check the sensor side of the plug, it could be they give me the wrong sensor.
 
  #4  
Old 11-21-2018, 03:18 PM
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are you running an efi setup that needs this type of o2 sensor? because our stock SD would use a different o2.
 
  #5  
Old 11-21-2018, 07:38 PM
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I'm using the factory type EFI standard issue 1991. I haven't had time yet but I want to check the orange wire to make sure it has continuity all the way to the EEC. Yesterday my speedometer gear stripped in the cold weather so now getting a code for no VSS signal now as well.
 


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