93 S-10 Blazer 4 W/D problems

[coketrash]

I`m new here, but I really need help !!!! You see it`s deer season here in the U.P. of Michigan, and a blazer with only 2 wheel drive just don`t cut it. I have a 93 S-10 blazer with touch button 4 w/d. When I try putting in to 4 hi both the 4 hi and 4 low lights flash, after several attempts at this both lights light up but it`s still in 2 w/d, if I hit the 4low side of the switch it will go in to 4 low and it has 4 w/d. I`ve tried removing a battery cable for a few minutes, and that did work until I shut the truck off and re-started it, so again it`s acting up. Also when it acts up, the only time I have any power to the 4 hi-4 low button is when the transmission selector is in neutral. Please help, I`ve only got a few days to get in the woods, it would be a hike without 4W/D Thanks in advance

[coketrash]

Can`t believe 8 views and no advise!!!

[BlazerLT]

Electronic Transfer Case Encoder Motor

Replace it.

[alleng]

Originally Posted by coketrash

I`m new here, but I really need help !!!! You see it`s deer season here in the U.P. of Michigan, and a blazer with only 2 wheel drive just don`t cut it. I have a 93 S-10 blazer with touch button 4 w/d. When I try putting in to 4 hi both the 4 hi and 4 low lights flash, after several attempts at this both lights light up but it`s still in 2 w/d, if I hit the 4low side of the switch it will go in to 4 low and it has 4 w/d. I`ve tried removing a battery cable for a few minutes, and that did work until I shut the truck off and re-started it, so again it`s acting up. Also when it acts up, the only time I have any power to the 4 hi-4 low button is when the transmission selector is in neutral. Please help, I`ve only got a few days to get in the woods, it would be a hike without 4W/D Thanks in advance

I have seen the same problem before. There should be a ground wire on the back of each cyl head. Check to be sure that both are tight. They are the ground wires for the 4wd system. Good Luck.

[alleng]

I have seen the problem you describe. There are ground wires on the back of both cyl heads. They are the grounds for the 4wd system. If they are loose or the wires are damaged it will do exactly what you have described. Check them first before changing any parts. Also, if the system has seen a malfunction, sometimes you have to let the system relearn. Pull the 4wd fuse for 3 min. Then after reinstalling the fuse, turn the key on and off 5 times for about 5 seconds per time for the 4wd computer to relearn. Good luck. Greg

[coketrash]

Originally Posted by alleng

I have seen the same problem before. There should be a ground wire on the back of each cyl head. Check to be sure that both are tight. They are the ground wires for the 4wd system. Good Luck.

O.K., I`ve replaced the encoder motor, replaced the 4hi-4low switch, cleaned ALL the ground wires, pulled the fuse, re-installed the fuse, cycled the ignition switch 5 times, pausing approx. 10 sec. each time, replaced the vacc. switch. Worked as it should until I turned the ignition switch off, re-started the truck about 1/2 hr. later, then it was as it was before, so I disconected the battery cable again, waited about 5 min., re-connected the cable, again it was fine until I shut the truck off. When it`s working the 4hi will go in in all gears, at any speed, when it`s not working the 4hi-4low button only has power in neutral. I can get it in 4 low, but only by toggeling the switch numerous times while in neutral,

[Mikado14]

Are you getting any codes?

[coketrash]

Originally Posted by coketrash

O.K., I`ve replaced the encoder motor, replaced the 4hi-4low switch, cleaned ALL the ground wires, pulled the fuse, re-installed the fuse, cycled the ignition switch 5 times, pausing approx. 10 sec. each time, replaced the vacc. switch. Worked as it should until I turned the ignition switch off, re-started the truck about 1/2 hr. later, then it was as it was before, so I disconected the battery cable again, waited about 5 min., re-connected the cable, again it was fine until I shut the truck off. When it`s working the 4hi will go in in all gears, at any speed, when it`s not working the 4hi-4low button only has power in neutral. I can get it in 4 low, but only by toggeling the switch numerous times while in neutral,

No codes, other tha this, everything is fine.

[coketrash]

I`m getting to think this truck just isn`t worth the aggrivation

[Mikado14]

On second thought, I think I spoke with you before. Did you check the relay that is located behind the glove box? Did you check the plug at the encoder to see if power is getting to it using a test light?

[coketrash]

After I disconect the battery, and turn the ignition switch on for the first time the relay and the motor both operate as they should, it`s after I turn the ignition switch off, and then re-start the truck that I have problems

[Mikado14]

Do you hear the relay when this happens? If you don't, try wiggling the shifter lever. The ECM gets a signal from the switch as to what gear it is in, more than likely, that is not the problem. I take it that you never rechecked the power to the encoder when it does this on the second try?

[coketrash]

When I first start the truck after the battery disconnect, I have power to the switch in gear, and to the relay, and motor. After I turn the truck off, and re-start, I only have power to the switch in neutral, tried wiggling the shift selector just short of tearing it off the column!!

[BlazerLT]

Again, replace the encoder motor.

Does anyone listen anymore!

[rlith]

Originally Posted by BlazerLT

Again, replace the encoder motor.

Does anyone listen anymore!

Obviously you don't, he already stated he replaced the encoder motor. More than likely it is the relay that sit's inbetween causing the problem. Either that or the BCM (Body control module) is not feeding the signal correctly.