How to locate the ABS sensors in the front wheels on a '97 D90? - Defender Source
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  #1  
Old June 23rd, 2009, 04:18 PM
beko35
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How to locate the ABS sensors in the front wheels on a '97 D90?

I had a P1317 code and was wondering how i can find it, so i can clean it before resetting code with OBD2 scan? Thanks!
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  #2  
Old June 24th, 2009, 01:17 PM
beko35
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bump
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  #3  
Old June 24th, 2009, 01:53 PM
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Each front corner will have two things outboard of the framerails, one is a hydraulic line for the brakes, the other is the wire to the sensor that inserts into the top of the knuckle.
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  #4  
Old June 24th, 2009, 05:12 PM
beko35
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Thanks Joel!

I'll try to look for it.
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  #5  
Old June 24th, 2009, 06:24 PM
Chaucer
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97 D-90s don't have ABS...That code should be for the "Rough Road Sensors"
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  #6  
Old June 24th, 2009, 10:27 PM
beko35
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"Rough road sensors....ABS" Could it all be relative? ABS is what shows on the code?
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Old June 24th, 2009, 11:10 PM
Chaucer
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I think it basically means the same thing...do a search on the code and you'll find a few threads on the topic.
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Old June 25th, 2009, 09:39 AM
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There are knock sensors on either side of the engine block that tell the OBD engine computer if any of the cylinders does misfire, however it is also possible to trigger the sensors when you hit a bump or something offroad, so the engine computer looks to the ABS system to see if there were any erratic readings from the 4 wheelspeed sensors that would indicate that you are on a "rough road". So even though a '97 D90 does not have ABS it still has the wiring, computer, and sensors- just no brake modulator. As far as I can tell there is no other purpose for having these parts on the '97.

Here is where it gets interesting- lets take the example of a 1997 Discovery with the automatic transmission... it has the same basic engine, engine computer, etc except it has a full ABS system. However when the ABS system starts to be problematic, you can simply pull a fuse or two and remove the ABS warning lamp from the dash with NO adverse effects and NO malfunction indicated by the engine computer. I did this to my '96 Disco which I put many miles on as a lifted and locked daily driver and never once got a misfire code in error from hitting a pothole, curb, washed out rut, small child on a tricycle, construction zone orange barrel, or big green garbage can, anything...

I have asked Pendy about removing the pseudo-ABS system from a '97 Defender and he seemed to think it couldn't be done without causing a problem to the engine computer- and I don't mean to second guess him but I dunno though.
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  #9  
Old June 25th, 2009, 05:19 PM
beko35
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Thanks for help everyone.
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  #10  
Old August 2nd, 2009, 02:24 PM
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I've got a P1317 code as well. Before I clear the codes with my reader I was going to check the sensors as well. Can someone tell me if I'm digging in the right place? (See attached pic.)

Is the rough road sensor / wheel speed sensor what I have indicated in the photo? If so is it simple enough to pop out, check wiring and put some dielectric grease in/on it (or is dielectric grease no-no near a sensor)?

(and for craps sake yes I've searched the forum and seen the threads on P1317. I'm not questioning what it is or why it's there in D90s just some tips of cleaning them and checking the wiring )

Hutch
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  #11  
Old August 19th, 2009, 07:32 PM
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Just bumping this one...

Can someone let me know if the photo in my last post is the rough road or wheel speed sensor?
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  #12  
Old August 20th, 2009, 10:50 AM
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Yes. That is the sensor. I removed all 4 when I converted to the 300tdi. Plugged the empty holes with a penny and some silicon glue.

Dennis
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