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Thread: 4wd will not work

  1. #1
    Join Date
    Sep 2007
    Posts
    329

    Default 4wd will not work

    When I try to use 4H or 4L, it grinds but will not engage. I searched SSdieselsupply site and it says the OE 4X4 Actuator is the likely culprit. Is this information accurate and there anything else I should check before ordering one? Should I also replace the Four Wheel Drive Actuator Switch?

    OR, the Posi-Lock 4x4 Positive Axle Engagement System looks like option 2. Which would you guys recommend?
    Last edited by RipnRun; 06-20-2016 at 10:49 AM.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  2. #2
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
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    2,807

    Default

    Won't be the actuator, it just engages the front diff. You have the electronic shift transfer case. The most common problem is the encoder that senses the position of the shift motor, it can get confused, so pull the transfer case fuse out for 3 minutes. Put it back in, switch ignition on 5 times, then try 4wd. If that doesn't fix it, the encoder could be bad, or the shift motor. You could try direct power to the shift motor to see if it is bad. Google search is better than looking at one site, you should be able to find which pins on the motor supply power to move it, others send info back to the encoder.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  3. #3
    Join Date
    Sep 2007
    Posts
    329

    Default

    Thanks, I will try that 1st. Is the the transfer case fuse located in the dashboard or under the hood?
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  4. #4
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    I think it is fuse #2 in the dash board.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  5. #5
    Join Date
    Sep 2007
    Posts
    329

    Default

    OK... I looked at my dashboard fuses and it is #2, thanks Grancito. I see that there is no fuse in it and wonder why. I look at the panel guide and see that it should have a 20 amp fuse. Since the auto store is closed, I decide to try the 20 amp courtesy lights fuse. As I attempt this, I find that there is no existing metal receptacle piece inside the #2 fuse hole to plug the fuse into. I don't know how or when this happened. I hope and assume that there used to be a receptacle and fuse in the #2 hole because 4High worked great until sometime this past year. 4Low has been sort of iffy for a while. It didn't occur to me to look at that moment but either tomorrow or Wednesday I will make time to twist my fat ass and aching knees upside down into the driver's side and under the dashboard. If I don't break my neck, I hope to see the fuse receptacle dangling within easy reach and easy repair.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  6. #6
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    Maybe someone has modified it, but it worked before, perhaps you have a changeover model. The encoder is under there close by, try to trace the wiring.
    And talking about sore muscles, I and trying to remove the engine from my suburban, it is going to have a new block.
    Last edited by grancito; 06-21-2016 at 12:49 AM.
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  7. #7
    Join Date
    Sep 2007
    Posts
    329

    Default

    Does the encoder look like a cylinder? I can't find a picture of it. Thanks.
    Last edited by RipnRun; 06-21-2016 at 09:11 AM.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  8. #8
    Join Date
    Sep 2007
    Posts
    329

    Default

    Is this what the encoder looks like?encoder.jpg
    Last edited by RipnRun; 06-21-2016 at 12:39 PM.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

  9. #9
    Join Date
    Feb 2007
    Location
    Baja California Sur Mexico
    Posts
    2,807

    Default

    No, that is the motor on the transfer case, the best term to use is TCCM (transfer case control module). I lost a post. It is a box shape, see a photo at rockauto, "drive train", "transfer case control module".
    Grant H.
    1995 6.5 turbo GMC K2500 extra cab 4x4 pickup, PMD under bumper, mechanical wastegate, 228,000 miles, rebuilt engine, 4.10 diff, 16 mpg
    1994 6.5 turbo GMC K2500 4x4 suburban "F" VIN #9 resistor, PMD in the bumper, mechanical waste gate, 226,000 miles, Positrac 3.73 diff, 17 mpg highway.
    1982 4x4 shortbed 6.2 Chev 260,000 miles untouched motor 17 MPG 4.27 diff. Best thing I ever owned, 21 years.

  10. #10
    Join Date
    Sep 2007
    Posts
    329

    Default

    Thank you. We are currently having a thunderstorm. I will find it in the morning.
    1997 Silverado 1500 6.5. with 185,000 miles. New fuel injection pump at 132,000 mi. FSD Heat-Sync in bumper hole, marine fuel injectors, air induction kit all from Walt at 148,000 mi. Replaced OEM Fuel Filter Assy, wastegate solenoid valve, OPS and relay at 155,000 mi. Harmonic Balancer replaced. Red dot and White dot EGR replaced. New starter, Instant Heat glow plugs, and glow plug relay/controller at 180,000. Replaced hydroboost and master cylinder in 2016.

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