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Current diagnosis ... check my work Posted by bobc [Email]  (#473)  [Profile/Gallery]
(more from bobc) on Tue, 19 Feb 2019 12:14:13
In Reply to: ABS saga continues, bobc [Profile/Gallery]
, Thu, 14 Feb 2019 12:12:19
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Summary: I think that number 1 suspect is the ABS Wheel Speed sensor *connector*, at the wheel.
Details of my steps follow. I'd appreciate any thoughts, comments.
Tech2 reports C1387 - Right rear wheel speed sensor, no signal. This single code persists despite:
- driving
- disconnecting both wheel sensors and driving
- clearing the code and driving with both sensors disconnected.
I expected I would get a code for both sides, but never did, under any condition. Frankly I can't make sense of this, so I'm going to ignore this for the time being!
I pull out my DVMM to do some brute force, static testing:
Resistance at the sensor (using a pigtail plugged in at the sensor)
- right: 1040 ohms
- left: 1039 ohms
plugged in sensors and put wheels back on, and turn my attention to the junctions (108-111). The wires from the sensor come in on the floor, under the carpet, into splice (a junction). From there the wires proceed into the door sill and on to the ABS module.
I sever the junctions (again) and take some measurements:
- Check ground to the ABS module:
Left ground to right ground: 0 ohms
Left ground to chassis ground: 0 ohms
Right ground to chassis ground: 0 ohms.
** this confirms that ground to the ABS module is good**
- Checking signal wires to ABS module:
left signal to left ground: infinity
right signal to right ground: infinity
**I assume this is normal, it's what I would expect for a static resistance measurement of the input side**
Now, checking the sensor input between the junction and the sensor.
- Left signal to left ground: 1040 ohms
- right signal to right ground: > 10,000,000 ohms
Bingo! (I think)
since that sensor reads 1040 ohm at the wheel, I believe that this confirms that there is a problem between the junction and the connector to the sensor. The most likely location is at the connector itself ... corrosion perhaps?
Next steps:
I ran out of time and the next step will have to wait a week or more. But I intend to splice in a new connector. And retest. Worst case I can run complete new wire from the sensor to the junction.
what do you all think. Am I on the right track or missing something?
The Tech2 results are odd and I dont know what to make of it. But at this point I've confirmed that the signal is *not* reaching the junction. I'll resolve that first, then see what else awaits.
->Posting last edited on Tue, 19 Feb 2019 13:36:30.
_______________________________________ '08 9⁵ 2.3T SportCombi, Polar White '01 9⁵ Aero Midnight Blue (benched) '00 9⁵ Aero Midnight Blue (rescued) '99 9⁵ Base model, Cosmic blue '00 9⁵ Aero Silver (RIP - transmission )
, Thu, 14 Feb 2019 12:12:19, Tue, 19 Feb 2019 12:14:13 <-- Viewing This Message
, Tue, 19 Feb 2019 16:25:04
2, Wed, 20 Feb 2019 07:42:21, Sun, 17 Feb 2019 07:52:411, Sun, 17 Feb 2019 20:34:22, Sat, 16 Feb 2019 09:03:18, Tue, 19 Feb 2019 08:08:081, Wed, 20 Feb 2019 13:12:20, Wed, 20 Feb 2019 14:46:25
, Fri, 15 Feb 2019 09:59:23, Tue, 23 Aug 2022 15:26:36
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