GO FISHING, use SLABSAUCE Fishing Attractant
Results 1 to 8 of 8

Thread: E39 ABS sensor testing question

  1. #1
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,483

    Default E39 ABS sensor testing question

    I have a bad right front ABS sensor in a 2000 528i E39. I ordered a new one but when I ran the diode test on it, it is reading OL. I should be getting about 1.8 to 2.0 volts. When you first get the sensors do they have a current or do you have to run them for a while to polarize them?

  2. #2
    Join Date
    Feb 2006
    Location
    Oldham, England
    Posts
    3,078

    Default

    Maybe check to see if you have the later 'active' type of ABS sensor - you cant check them with a DMM on ohms. I dont have a Bentleys for the E39 but this might help:

    Diagnosing Wheel Speed Sensors: Brake and Front End
    Oct '00 E46 330i. Feb '92 525i (departed)

  3. #3
    Join Date
    Jan 2004
    Posts
    4,150

    Default

    I've never had to run them awhile, usually they will read on the scan tool immediately. I just replace them and drive the car watching the wheel speed on all four wheels with a scan tool.


  4. #4
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,483

    Default

    Purchased a sensor locally and ran a diode test on it. Reading was 1.8 volts. Installed and all the trouble lights went out. So the sensor I purchased from an internet source was garbage. mpgautoparts.com. Won't buy from them again. Anyone know the male counterpart for the wheel pulse sensor connector. They are brittle. Been looking for them on line but no joy. Can read several numbers on the connector. Can find internet hits for 4-963505-1 it says its a connector but no other information. There is another number 1393748 with BMW stamped next to it but this number doesnt add up to anything.

  5. #5
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,483

    Default

    What scan tool?

  6. #6
    Join Date
    Jan 2004
    Posts
    4,150

    Default

    I either use autoenginuity or a snap on modis, i actually prefer autoenginuity for bmw's


  7. #7
    Join Date
    Apr 2006
    Location
    Chicago, Il. U.S.A.
    Posts
    4,243

    Default

    Test at the ABS module connector also. This will also indicate wiring issues. The connectors are crapola and prone to corroded pins, I've seen them completely dissolve.
    At the module connector; pins 15 blue & 16 yellow are RF, 12 black & 28 blue/red are LF, 30 blue/green & 31 green are RR, 13 blue/white & 29 white are LR.
    The diode test should indicate 1.4-1.8 & open when the leads are reversed.
    Let me know if you still need a sensor, I probably have it.
    "The gas pedal wouldn't go to the floor if it weren't meant to be there"

  8. #8
    Join Date
    Jan 2007
    Location
    Dayton Ohio
    Posts
    1,483

    Default

    Done and done. Right front sensor bad. Your right the connectors are crap very brittle. Purchased a sensor pricey little bugger. Shop price $70. Looking for replacements for the male connector side. Figured I can remove the contacts and slide them into a new connector. Contacted local dealer he said he doesn't think they are available

Similar Threads

  1. Testing Crank Position Sensor
    By Kobe Diesel in forum 5 Series BMW
    Replies: 14
    Last Post: 09-03-2007, 01:47 PM
  2. Temperature sensor testing with a variable resistor?
    By Kibokojoe in forum 5 Series BMW
    Replies: 3
    Last Post: 04-22-2007, 09:23 PM
  3. Fuel Pressure Testing Question
    By av8r in forum 5 Series BMW
    Replies: 2
    Last Post: 02-12-2007, 05:14 PM
  4. exhaust question: o2 sensor placement
    By marckula in forum 5 Series BMW
    Replies: 8
    Last Post: 04-19-2006, 01:51 PM
  5. oxygen sensor question?
    By scott540 in forum 5 Series BMW
    Replies: 4
    Last Post: 06-18-2004, 11:15 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •