Question about 2007 GMC Sierra 2500HD

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Hooking up a jamar technologies RAC1 distance measuring device

I am supossed to hook into pin 71 on the ecm how do I find this on the ecm what color is it? 2007 6.0 2500 hd Two wheel drive Gas On a four wheel drive it hooks into the purple/white trace wire on the transfer case..??

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Posted on Jan 02, 2017

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SOURCE: 2000 gmc 4 wheel drive

Look in your fuse box for the bcm fuse (body control module) and remove the fuse atleast for a mint and then start the vehicle, put it in neutral and disengage the 4L and you are done once it is disengaged turn the vehicle off and re-insta the fuse yo pulled out and you should have no problem.

Posted on Dec 01, 2008

  • 78 Answers

SOURCE: four wheel won't engage

Theres a vacume dash pot under the battery box. It pulls a cable that engages the front diff. Put the vacume line and you'll have lights and four wheel drive. (it happened to my blazzer)

Posted on Dec 29, 2008

  • 90 Answers

SOURCE: Service four wheel drive

Without further diagnostics, it could be any # of causes, but these are notorious for bad conections at the transfer case encoder motor and /or the encoder motor itself.The motor,when replaced may need to be reprogramed.Be sure the switch and wiring are functioning properly as the encoder and/or related control module are pricy$$

Posted on Jan 10, 2009

  • 6 Answers

SOURCE: Front drive, 4 Wheel drive won't engage

Check the switch on the transfercase remove the vacume lines if there is oil in them the switch has to be replaced and the lines should be cleaned out you should also check under the battery tray to make sure the boot is not ripped that controls the leaver to engage the front axel

Posted on Feb 16, 2009

mattman2112
  • 57 Answers

SOURCE: 4x4 in working

try reversing six to eight feet after shifting into 4WD. PLEASE RATE MY ANSWER.

Posted on Feb 26, 2009

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IT IS NOT WORKING


Run this diagnostic
Test Procedures 
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2. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between ground 
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MAP sensor. If resistance is more than one ohm, repair open in Green wire between MAP sensor 
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3. Turn ignition off. Disconnect MAP sensor 4-pin connector. Measure resistance between MAP 
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4. Turn ignition on. Measure voltage between ground and MAP sensor connector terminal No. 2 
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