ABS codes

Howdy,
Heres an interesting issue. I have searched around and while there is plenty of information but nothing like this.
I just finished replacing the rear axle housing as well as the wheel bearings built by. Upon first start up its throwing a check engine, ABS, brake lights and speedometer does not function. CEL Code is 0500 and ABS codes 33/34 indicate issues at both rear ABS sensors. I have replaced the 4pin connector with a Deutche 4 pin connect a couple years back so I'm very familiar with this portion of the harness. current(pun) situation:

1. crimps and connection verified as good at connector
2 pin out verified as correct
3. continuity measured good
4. resistance in this portion of harness measure and within spec. -1ohm
5. voltage (11 or so volts) reaching is reaching correct pin @ sensor connection
6. wheel bearing assemblies built by 05taco4x4 on here that se
Here's where it gets kinky. when I release the CEL code(0500) via scanner and the ABS codes(33/34) via pin 4&13 jump and 8 pedal presses the truck works beautifully, speedometer works. That is of course until you reach about 65mph and the speedo drops and throws codes. Any ideas?

 

bump!

 

Since you seem to have checked the wiring electrical portion and all is good. It is now time to look at the mechanical.

I would suggest pulling the ABS rear sensors and look at them to see if they are rubbing on the tone ring. The sensor should never touch the tone ring. If the sensor has marks on it, something is wrong. This could be caused by an improperly pressed bearing.

 

DTC Number:

C0200/31
C0205/32
C0210/33
C0215/34

DTC Detecting Condition

When any one of following conditions met:

1. At vehicle speed of 6 mph (10 km/h) or more, speed sensor signal circuit open or short for 1 second or more.
2. Speed sensor signal open circuit occurs at least 255 times.
3. Speed sensor signal circuit open for 0.5 seconds or more.
4. With ignition switch ON and vehicle speed at 2 mph (3km/h) or more, 3 wheels output reverse rotation signal and 1 wheel outputs high-frequency pulse 75 times.
5. At vehicle speed of 6 mph (10 km/h) or more, speed sensor output halves for 5 seconds.
6. At vehicle speed of 6 mph (10 km/h) or more, changing of normal rotation signal and reverse rotation signal occur 7 times within 0.006 seconds while ignition switch ON.
7. Signal output of any one wheel different from signals of other 3 wheels for 1 second, at vehicle speed of 18 mph (30 km/h) or more.
8. Reverse rotation signal produced for 1 second or more at vehicle speed of 62 mph (100 km/h) or more.
9. At vehicle speed of 18 mph (30 km/h) or more, one speed sensor malfunctions and differs in signal direction from other 3 wheels.
10. When voltage at IG1 terminal 9.5 V or more, voltage of sensor power supply decreases for 0.5 seconds or more

Trouble Areas:

•Speed sensor
•Speed sensor circuit
•Master cylinder solenoid (skid control ECU)

 

Is there a chance that the tone ring is “backwards”?

I say this because;

1. Reverse rotation signal produced for 1 second or more at vehicle speed of 62mph (100 km/h) or more.

2. You say it happens “around 65 mph”

I have no idea if this is possible?
I’m just guessing, but I am curious If a tone ring can be installed or made to read in the reverse direction?

 

Something to think about. I suspect that the Hubs were not assembled correctly based on what he says he checked already.

 

It cannot, the same bearing is used left and right.

This is likely the rear ABS harness above the axle.

 

Pull the sensors and look down the hole. You should see the tone wheel in view at the bottom of the hole. If its too far to the side, the bearings/sleeves were pressed on incorrectly.

If the tone wheel is centered/mostly centered under the sensor then its either a weak sensor magnet (bad sensor) or an open/chafed harness

 

clarification: it happen at exactly 65MPH on the speedo which is about 67.5MPH in reality

 

I have disassembled the passenger side as there was a smidge of fresh gear oil on the sensor when I pulled it out and the seal did not go in exactly perfect(those are a bit of bitch) so i figured there may be an interference/leak issue. Replaced the seal which went in perfectly this time and there was no change. While i haven't disassembled the driver side I have confirmed that there is no rubbing of the sensor on the tone ring.

 

with all the checks and confirmations I listed above what do you think I'm missing here in the harness department?

 

Continuity

 

completed as number three and all other tests would depend on this

 

Looking back at your OP I would still have to say a defective Hub assembly or a defective sensor.

Best of luck locating the exact source.

Check the harness from the ABS Skid Control ECU;

 

Thanks everyone, I just had a thought or brain fart. When I originally repaired the harness prior to this challenge, the speedo came up and warning lights went away without me having to clear them. Earlier, I did trade sensors with a buddy without success BEFORE learning and executing the 4&13 pin jump ABS code release. I wonder if Ive been chasing my tail on this. I'll try the trade again tomorrow

 

Keep us updated!

 

Did the ol sensor switcharoo and got the same results. Since the vehicle is indicating both sensors are an issue I'm beginning to suspect the wheel bearings. Does anyone know if there is different tone rings for different vehicles? perhaps a different "tooth" configuration.

I meant to delete the mention of 05taco4x4 in bullet point number 6 prior to posting, hence the incomplete sentence, as I purchased these rear bearings a few years ago from some vendor on here but can find no record of the transaction so don't want to give the wrong impression that he is involved.

 

Try some continuity testing again while pulling/tugging on the harness. Sometimes a OL will show up for a quick second when you start flexing stuff around. Could be a brittle spot under the insulation that you can't see where there's just a strand of wire hanging on

 

I would think the MPH would be off all the time if the tone ring was “different”?

 

Yeah i am reaching but I'm running out of ideas here. I just cant wrap my head around both sensors throwing codes