Abs Light/ Help Needed

[Phil94850]

I decided to open up my ABS module and re-solder the joints. As you can see in the pic below with the pump motor plug unhooked im getting about 9 volts, but.. when I plug the pump motor plug back in and probe the wire going to the motor im getting nothing.

I used jumper wires from the battery and ran 12v constant to one side of the pump motor plug and a ground from the battery to the other side of the plug and the pump motor comes on. That's why I think the module must ground the other wire to make the pump run when it needs to..

My question is.. should I get constant voltage thru the plug to the pump or does it stay zero volts until the module activates it by grounding the other wire ? Trying to figure out if I have a bad plug or what ??

did the test procedure per Midwest ABS to check the ohms between the ABS connector and the wheel sensors.. all sensors should ohm between 900-1380. My wheel sensors all showed good except the right rear..

LF- 1129 ohms
RF- 1155 ohms
LR- 1123 ohms
RR- 0 ( I guess bad sensor or wire problem ? )

[mattwebb502]

I would think that the driver supplies a low current all the time and monitors this to determine that the motor is plugged in and in spec.

With this it can store a code for a defective motor and light up the ABS light to make the driver/technician aware of the issue.

What you are seeing is probably normal.

You will probably find that your ABS and/or TRACS lights illuminate on the dash when you put it all back together.

After a short drive the module will determine the health of system and turn the lights off if everybody is functioning properly.

[Phil94850]

thanks Matt... I agree I think the voltage is normal at the plug and with no ohms reading at my right rear wheel sensor I hope that's whats causing my ABS light.

sent you a PM matt