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Old 07-06-2009, 06:37 PM
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Default 1998 Chevy Blazer 4X4 problem

Blazer will not shift into 4 hi or 4 lo. 4 hi button blinks and goes back to 2 hi. Tried disconnecting battery, but same issue after reset. Checked wires at TCCM, but seem okay. What is bad? TCCM?
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Old 07-07-2009, 05:18 AM
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3 button
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Old 07-07-2009, 05:37 AM
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the computer sees that the transfer is not completing a shift. can be mechanical or electrical problem. encoder motors are known to go bad.
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Old 07-07-2009, 09:18 PM
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Before you assume the encoder motor is the problem, run through the proper testing. Start with getting the codes from the TCCM (OBD2 Non-Automatic Transfer Case Diagnostics). It could be corrosion at the encoder motor. It very well could be an encoder fault, but it is easy enough to check the codes.
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Old 08-13-2009, 08:04 PM
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Originally Posted by swartlkk View Post
Before you assume the encoder motor is the problem, run through the proper testing. Start with getting the codes from the TCCM (OBD2 Non-Automatic Transfer Case Diagnostics). It could be corrosion at the encoder motor. It very well could be an encoder fault, but it is easy enough to check the codes.
I just bought a 99 Blazer a couple hours ago with this same problem. Mine has the 3 button switch.

#15 Fuse keeps blowing out (for the 4x4).

What does TCCM stand for ??

I assume the encoder motor is which does the actual shifting in the transfer case ?
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Old 08-14-2009, 10:37 AM
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TCCM == Transfer Case Control Module

It is the brains in the 4wd system. It is located behind the passenger front kick panel.
 
 
 
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1998, 4x4, 98, blazer, blazer4x4, button, chevy, motor, problem, problems, shifting, stand, switch, tccm, transmission, workig


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