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post #1 of 30 Old 03-25-2019, 04:08 AM Thread Starter
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Unhappy New here, 2006 altima 3.5. Big issue with ABS

Hi there, I have been attempting to tackle this issue with my abs system for a while now. I have got frustrated to the point that I have searched for a forum and have found nissaclub.

I am getting a code for my rear left abs sensor. I have tried 2 other sensors from other cars and they haven't worked. I have tested resistance of these sensors and they all measure around 1.03. My working sensor also measures the same. I thought maybe it could be something with the ring inside the wheel bearing then, so I tried a different wheel bearing. Code still comes back right after I clear it. I believe I could have an issue with the wiring of the actual connector. I tried to measure voltage to the wire, but here is the weird part. I get 0v from any pin.

I am grounding to the chassis and trying both pins of the connector. I have also tried the working connector and I get 0V even though there is no code for that connector. I also get a code when I unplug that connector so I know it is not an issue with the computer.

Another weird thing is when I attempt to test for AC voltage by spinning the wheel none is created by either sensor. This is even more confusing.

I really don't know where to head with this and I do not have money to take it to a mechanic at all, but I don't want to drive a dangerous car! Please help me
Thank you.

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post #2 of 30 Old 03-25-2019, 03:24 PM
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Hi,

When you had the hub off, did you clean the sensor ring (flat disc on end of hub that lives inside the rear knuckle)? As long as there is no build up of rust powder, the ring should work well.

You won't be able to 'see' the voltage produced by the sensor unless you have 'microvolt' capability.

Based on issues with another similar vintage car, I would say your wiring is most likely the culprit...and it's most likely at the big connector at the ABS controller in the engine compartment...those contacts are known to corrode (greenish coating). Have a look there and while you're in there, beep out (continuity) and also perform a resistance test of both the rear lines (while sensors are disconnected!).

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post #3 of 30 Old 03-25-2019, 04:38 PM Thread Starter
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Originally Posted by d0ugmac1 View Post
Hi,

When you had the hub off, did you clean the sensor ring (flat disc on end of hub that lives inside the rear knuckle)? As long as there is no build up of rust powder, the ring should work well.

You won't be able to 'see' the voltage produced by the sensor unless you have 'microvolt' capability.

Based on issues with another similar vintage car, I would say your wiring is most likely the culprit...and it's most likely at the big connector at the ABS controller in the engine compartment...those contacts are known to corrode (greenish coating). Have a look there and while you're in there, beep out (continuity) and also perform a resistance test of both the rear lines (while sensors are disconnected!).
I'm not sure what you mean by flat disc, but I cleaned all surfaces that the wheel bearing mounts to. Are you talking about the surface that the plastic guard mounts to? I also cleaned the bearing ring itself. Squeaky clean with brake cleaner. Also got a shot full of it in my eye . There was a slight bit of rust, but I'd barely call it surface rust. I doubt it's interfering.
I will check the big connector right now and update you with what I find. Will also test the rear lines. Thank you for the help!
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post #4 of 30 Old 03-25-2019, 04:50 PM Thread Starter
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So I see the abs module, I’m not sure where the main harness connector is though. Is it easily accessible or do I have to take some things apart to get to the ABS module?
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post #5 of 30 Old 03-25-2019, 09:40 PM
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Originally Posted by byte View Post
So I see the abs module, Iím not sure where the main harness connector is though. Is it easily accessible or do I have to take some things apart to get to the ABS module?
Lemme see if I can find M-train's thread...

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post #6 of 30 Old 03-25-2019, 11:41 PM
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Originally Posted by d0ugmac1 View Post
Lemme see if I can find M-train's thread...
Eh voila...

https://www.nissanclub.com/forums/20...1-codes-2.html

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post #7 of 30 Old 03-28-2019, 05:09 AM Thread Starter
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Originally Posted by d0ugmac1 View Post
Okay, I think I have an idea on how to do it now. I think I am going to head to the junkyard, see if I can remove one of the abs harnesses there, and clean+replace it with that one for good measure. Will update, thank you for the help so far!
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post #8 of 30 Old 03-28-2019, 01:35 PM
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This is the sensor ring I was referring to, opposite side of the bearing from the wheel studs.


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post #9 of 30 Old 03-30-2019, 03:25 AM Thread Starter
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Originally Posted by d0ugmac1 View Post
This is the sensor ring I was referring to, opposite side of the bearing from the wheel studs.

Hi, do I have to open that open that up and clean it? It seemed sealed. I wiped it down, but not necessarily squeaky clean. I tried a different wheel bearing that wasn't causing any codes (although the wheel bearing I tried is bad) and it didn't make a difference. Also I got access to grab the abs harness connector, but it's a bit hard to get off the controller. Hopefully I will have better luck tomorrow....

I also tried to remove the entire harness from the body of the car from the junkyard, but it seems to be a more complicated system than I thought. Sadly it doesn't just run from the front to the back of the car. There's some sort of plastic unit in the back that it connects to. Very confusing.

Hopefully I can just clean the connection and be good to go, but I'm not gonna get my hopes up. Don't you think a corroded connector would cause more problems than just a code for a single abs sensor?
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post #10 of 30 Old 03-30-2019, 01:05 PM
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As for the sensor ring, have a read through my 'Spurious ABS' thread in red in my .sig below

Yes an intermittent connection could cause just one signal to fail (for now, more to come for sure). You'll know as soon as you get the connector apart whether this is a likely reason or not. In M-train's case, it was one of the CANBUS wires which meant that the car computers could not talk to each other and it was throwing a U1000 code.

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post #11 of 30 Old 03-30-2019, 09:59 PM Thread Starter
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Originally Posted by d0ugmac1 View Post
As for the sensor ring, have a read through my 'Spurious ABS' thread in red in my .sig below

Yes an intermittent connection could cause just one signal to fail (for now, more to come for sure). You'll know as soon as you get the connector apart whether this is a likely reason or not. In M-train's case, it was one of the CANBUS wires which meant that the car computers could not talk to each other and it was throwing a U1000 code.
I read through the thread, I think the ring is adequately cleaned to be honest. I'll get it squeaky to be certain. Could the ring be damaged inside the bearing? I haven't got a chance to work on it today but hopefully I can squeeze it in before tomorrow. You're really providing me with a lot of information here, thank you. Weird to think a 100k mile Georgia car can have bad corrosion in electrical connectors.

The only other questions I have, is there a common place where the wiring harness gets damaged? And are there any other connectors besides the main abs controller that corrode? If not then I think I can tackle this job. Thank you!
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post #12 of 30 Old 03-30-2019, 10:18 PM
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I'm sure your ABS ring is fine. When it gets coatedin rust dust...it just triggers randomly when braking.

Could be salt air is worse than salty slush? Dunno...but MTrain's SER was far enough south to not see a lot of snow...so similar climate to Georgia I think (I used to travel to Norcross GA for work...)

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post #13 of 30 Old 04-01-2019, 05:13 PM Thread Starter
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Originally Posted by d0ugmac1 View Post
I'm sure your ABS ring is fine. When it gets coatedin rust dust...it just triggers randomly when braking.

Could be salt air is worse than salty slush? Dunno...but MTrain's SER was far enough south to not see a lot of snow...so similar climate to Georgia I think (I used to travel to Norcross GA for work...)
That's funny, I actually grew up in norcross georgia. I'm over by woodstock now if you know where that is. Still haven't got the chance to work on it.... but today I will for sure.
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post #14 of 30 Old 04-01-2019, 07:35 PM
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^^small world, eh?!

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post #15 of 30 Old 04-01-2019, 07:51 PM Thread Starter
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Originally Posted by d0ugmac1 View Post
^^small world, eh?!
Tell me about it haha!
So I got the windshield wipers out and the cabin filter and all out and now I have access to the connector. Looks like this is gonna be really confusing to get out.. wish me luck
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