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4WD vacuum solenoid problem

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Old 11-09-2018, 12:49 AM
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Default 4WD vacuum solenoid problem

Hello,

I have a problem with my 2001 Chevy Blazer 4.3L LS imported from Japan so RHD.
When I try to engage the 4WD with the buttons (4 button system) it keeps blinking.
I have tried to use another solenoid, they both give a resistance of around 75 Ohm. Is this normal?
I do get power on the solenoid connection. I tried to connect the vacuum hoses to each other. I do get 4WD then and the blinking stops so my actuator or transfer case work.

Does anybody know of this problem and knows a solution?
 
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Old 11-09-2018, 02:53 PM
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Is the transfer case control module (TCCM) working correctly? When they start to fail they will often have an excessive amount of clicking noise coming from them. It is located behind the right hand side kick panel on the US trucks.
 
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Old 11-11-2018, 01:35 AM
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I am not a 100% sure about that, when I bypass the solenoid and just connect the two hoses together the 4wd is engaged so it works. It seems that the solenoid isn't working but as the actuator isn't engaging either when using the buttons normally
 
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Old 11-11-2018, 02:16 PM
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if you bypass the solenoid like you did and the 4x4 works as in the TCase is driving the front wheels than the solenoid is the problem.
 
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Old 11-11-2018, 10:07 PM
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What in the way of power do you get to the solenoid? 12V? Do you get the expected voltage when you depress the 4wd buttons?
 
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Old 11-12-2018, 11:48 AM
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I have also seen that solenoid stick and giving it a smack straightened it out for a bit.
 
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Old 11-13-2018, 09:06 AM
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Old 11-13-2018, 09:13 AM
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  1. Disconnect vacuum solenoid electrical plug and probe brown wire with test light connected to ground. Should have 12V. If not, check 4WD fuse.
  2. If #1 is OK, start engine and probe the grey/blk wire with a test light connected to 12V. Push 4WD button and test light should illuminate. If not, TCCM is not providing ground (control) for the solenoid.
  3. If #1 and #2 are both OK and solenoid does not operate, then replace it.
 

Last edited by LesMyer; 11-13-2018 at 09:16 AM.
  #9  
Old 11-17-2018, 02:17 PM
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Thanks guys!

I have sprayed some cleaner in the solenoid and pushed the 4wd buttons several times and it started working! It must have been clogged up. The 4wd system hadn't been used for a long time by the previous owner.
 
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Old 11-17-2018, 03:00 PM
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Originally Posted by StijnV View Post
Thanks guys!

I have sprayed some cleaner in the solenoid and pushed the 4wd buttons several times and it started working! It must have been clogged up. The 4wd system hadn't been used for a long time by the previous owner.
Thanks for reporting back and congrats on a an easy fix!
 

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