ABS Amigo codes - 046 & 022

[Jimbalyia]

First off, great site! Ive learned so much about my truck here. Thanks! Now for the details....

2002 DII with 3 extra lights on.

Just got my ABS Amigo and read my codes for my Amigo issue. (I've had the 3 Amigos constantly on ever since I bought the truck over a year ago.)

First read was
Active faults - 022 ECU Gnd or Reference Gnd bad
Logged faults - none

Two of the three amigos went away. Abs light remained constant on. I was on my lunch break at work so I didn't test drive after. Went back in and did some research on the ground fault. Got off work and decided to take another reading before leaving the parking lot.

Second read was
Active faults - none
Logged faults - 046 front left sensor output low

Here is where it gets fuzzy. I attempted to drive and my brakes are now kicking in on their own each time I go to accelerate. Really bad when I'm making a turn. My first guess would be traction control thinking one tire is slipping. (left front?) the truck will not go over 50mph now and the brakes keep kicking in.

I have put new pads, rotors and tires on in the past few months without issue. Never had driving issues even though the 3 amigos have been on for ever! Just wanted those lights gone. Now 2 out of 3 are gone and I can't drive my rover. Almost wish I would have kept my 3 pals.

Finally made it home. Just for kicks, I plugged in the abs amigo a third time just as I was coming in now and the third read is this:
Active faults - none
Logged faults - none

Mind you, I pulled in the driveway, shut down the truck, clicked key on and took a reading. Have yet to re-drive the truck since reading the "no fault" read. Is it possible it took 3 tries to clear or am I being too hopeful things will be better in the morning?

I've been combing this site for a while looking into these and found a few ideas about checking resistance at the sensor plugs and such. Guess I'll get on that in the morning if she still won't drive.

I guess my questions for the experts out here are:

Am I right about it being the traction control "thinking" my left front wheel is spinning differently, thus applying the brakes? It seems to be the right front brake that is being applied. ( wants to pull to the right when it happens )

Is it safe to assume that my shuttle valves are working and don't need rebuilt?

Where do you think I should start??? (sensor, modulator, etc.)

Does anyone have a ballpark guess at what this might cost to fix? ( $100 vs $1000)

I would be doing the work myself. I have the RAVE. Any feedback would be great. Thanks all!

[jafir]

Check the grounds behind the left front (left viewed when sitting in the car) headlight.

[rickster22]

I would check the ABS sensors on the wheels and make sure that they are properly connected and not loose and would also replace the ABS module. my P38 also had the 3 amigos, went to a junkyard and got a used one for $25 and done deal no more Three amigos!

[Jimbalyia]

Well, I tore into things today. Check the grounds behind the headlight. They look great. Checked front wheel sensors. Right side was original and looked ok. Left side looked new and was spliced at the plug under the hood. I'm assuming it had been replaced as I've seen them sold without the plug. Checked the hub. Looked great, all teeth looked great. No slop or play in the bearings, joints, or rod ends. Checked sensors for resistance. Got 1022ohms on the left, 1032ohms on the right. I think they are both on the high end of ok, not sure. I think I recall reading 950-1050 is ok.

Seeing as everything checked out, I cleaned things up, lubed all the little bits, buttoned it up, and test drove it. As I figured, nothing had changed. Brakes kicked in as soon as I put my foot on the accelerator. Traction control light came on during this then went off. ABS light came on and remained on. Pulled it back in the driveway.

The truck needs to get me to work Monday, so out of desperation, I just unpluged the two front sensors. This triggered an inop fail of the sensors and shut down the abs/tc. At least this is my thought. The result was that the truck is now at least drivable, the 3 Amigos are back, and I'm no further than I started. Lol

I'm guessing the next step will be the dreaded modulator fix? Any thoughts?

[rickster22]

My thought is that your ABS module has gone haywire and needs to be replaced if everything seemed OK with the sensors. I would replace the module and get the ABS running the way it needs to. Just make sure you disconnect the battery before you mess with electrical on these rigs they tend to cause more problems when they short out.