ElectronTube

a 1999 2000 xl 4.2 L basic truck with only rear ABS .. how can i check if the abs valve unit under the the break fluid system ... i like to see if it works or not .. not sure if it has motors or solenoids

..

Carcrazygts2

Have to have a scan tool.

ElectronTube

i thought it could be simple ... to be able to turn off and on the solenoids... and see how the fluids behave.. on the way out ... what code would i read if this unit was bad.?? just to be sure ..
sincerely thank you for your time

Carcrazygts2

I cant tell you what code. You would have a abs light if it was not functioning correctly.

River1

It has a solenoid and it's a common failure. l believe the anti-lock is vacuum operated. Kelsey Hayes made the modules. NHTSA Reference #607072 is for the light being on but no code to go with it. The problem on my truck turned out to be the speed sensor.

ElectronTube

i get code 8 no dump valve self test ..., would this be the valve unit iam talking about .. the one under the booster ...line going to rear brakes..??
any one has some good idea.?

Carcrazygts2

Code 8 signifies a failed dump valve solenoid. Time for a new RABS units.

ElectronTube

ok thank you .. i will look into it .. finding a part to replace this one

River1

You shouldn't have any trouble finding one. Here's this too if it helps any:

http://www.aa1car.com/library/abs_kelseyhayes_rwal.htm

http://www.aa1car.com/library/abscodes.htm

ElectronTube

just an update i replaced the RABS valve twice .. bought 2 from a wreck yard..yes i know .. they might be bad .. and the light stayed ONN.. finally i got the electronic control unit .. and the light is dead ... so i think its all good .. was not the valve .. i do not have a special device to test them .. but seems that they are bullet proof basic solenoids .. the only pin i can not test on the valve was the rest wire .. has no resistance ... as if its not connected internally .. for the 3 RABS valves i had

again i was getting code 8