I pulled the codes for my ABS and got these codes:26, 28, 35, 37, 65. Code 65 is bugging me because it means a swap on the (EHCU). I did find this write-up on code 65, can anyone confirm this info?

"GM Truck
False ABS code 65. According to Raybestos, whenever you see a Kelsey-- Hayes 4WAL ABS code 65 accompanied by a wheel speed sensor code (23, 27, 28, 29, 33 or 37) on the GM trucks listed here, be careful not to misdiagnose the cause. The code 65 is probably fake.
Affected trucks include 1991 four-- door Chevrolet Blazer/GMC Jimmy models and 1990 Chevrolet Astro/GMC Safari minivans built before the following VINs:
M-van (2WD):
Astro ... LB225290
Safari ... LB543964
L-van (AWD):
Astro ..............LB225573
Safari ... LB544127
This is all caused by a glitch in the 4WAL computer. Normally, a code 65 indicates an open in the pump motor relay circuit. So if you find this code set alone during diagnosis, treat it as real and follow through the appropriate trouble tree. If the motor relay really is bad, the electrohydraulic control unit (EHCU) needs to be replaced, because the relay is integral with it.
But if there's at least one wheel speed sensor code set with the 65, be suspicious and definitely don't replace the EHCU...at least not yet. Take care of the other codes first. Then clear all codes and test-drive the truck, performing several ABS stops to put the system through its paces. If the code 65 doesn't reset, you should be home free."

Update: I did some looking around at the ABS sensor connectors and they all looked good, clean. Came back and cleared the ABS codes, the only code that popped back was (35), which is spose to be the left rear sensor. I did an ohm check and that sensor is almost 2000k. Strange thing is the wiring diagram, the wire colors show it as right rear sensor. There is something conflicting between the code and the diagram, but never the less, I think I am one sensor away from fixing this problem. Going to pull a used sensor from the local pick and pull as soon as it stops freaking raining here.

 

Installed a used ABS sensor today and now I have anti-lock working. I am rather surprised that this went that easy. Got the part from pick and pull, made sure it was a good one by checking the resistance before I pulled it - total cost on this repair 12 bucks. While I was in there replacing the sensor I found a few other problems with the rear brakes. The wheel cylinder is leaking, shoes are shot and the drum was grooved. After replacing the sensor I rolled back to pick and pull grabbed 2 drums, ready to install, and all the springs and brake hardware. Hit up the parts store and got 2 new wheel cylinders and shoes. Total investment for the rear brake job - 100 bucks. Going to get the rear brakes done tomorrow.