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  #13  
Old 12-02-2013, 03:40 PM
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Re: SERVICE 4WD SYSTEM Sensors

Quote:
Originally Posted by brentwoodkris View Post
If you're getting the Service 4WD message, you can probably do the key flick trick and get the DTC to display the code. That should at least let you identify L or R side. Without the StarScan or a tuner there is no way to differentiate between F/R. However, someone posted that you could measure the resistance of the sensors if you pulled them to tell whether they're still good or not.
Tried then found out the '08 doesn't offer the key dance.
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Old 12-02-2013, 03:42 PM
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Re: SERVICE 4WD SYSTEM Sensors

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Originally Posted by brubakes View Post
Tried then found out the '08 doesn't offer the key dance.
Ouch. I forgot they removed cool features like that and also being able to reset your service intervals, etc in the later years.
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  #15  
Old 12-03-2013, 08:11 AM
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Angry Re: SERVICE 4WD SYSTEM Sensors

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Originally Posted by brentwoodkris View Post
Ouch. I forgot they removed cool features like that and also being able to reset your service intervals, etc in the later years.
I know right! Especially when it was already there, so resources had to be used to engineer that out of the system.
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  #16  
Old 12-03-2013, 10:11 AM
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Quote:
Originally Posted by brubakes View Post
please correct me if I'm wrong, but don't you need the special dealer only star scan tool for the four wheel drive and ABS system codes?
You don't need star scan for speed wheel sensors. I've had mine scanned twice to pinpoint which one was at fault and both replaced and good to go
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  #17  
Old 12-03-2013, 10:35 AM
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Re: SERVICE 4WD SYSTEM Sensors

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Originally Posted by Jeepforthewin View Post
You don't need star scan for speed wheel sensors. I've had mine scanned twice to pinpoint which one was at fault and both replaced and good to go
So if a normal CEL scanner doesn't pick it up then safe to assume those wheel sensors are okay?
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  #18  
Old 12-03-2013, 12:38 PM
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Re: SERVICE 4WD SYSTEM Sensors

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Originally Posted by Jeepforthewin View Post
You don't need star scan for speed wheel sensors. I've had mine scanned twice to pinpoint which one was at fault and both replaced and good to go
I don't think this is true, unless perhaps the CEL scanner you have picks up ABS codes. The newer ones can do this, but IMHO, most people don't have those (they're more expensive and newer).

Quote:
Originally Posted by brubakes View Post
So if a normal CEL scanner doesn't pick it up then safe to assume those wheel sensors are okay?
Like I said above, if your ABS light is on and you have a CEL scanner that reads ABS codes, it possible that you might get a code that tells you which sensor is out of whack.

However, if you've just got the Service 4WD message, then no CEL scanner is going to give you any more info than you already have.
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  #19  
Old 12-05-2013, 07:56 AM
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Re: SERVICE 4WD SYSTEM Sensors

I replaced all 4 of my wheel speed sensor with no luck with the 4WD light. I then read a ton of threads and found it was more then likely the wire harness for the solenoid on the inside of the front or rear diff.

-Hop under your jeep to the rear diff.
-At the top there is one wire connection and only one disconnect it.
-Throw some test leads on the sensors 2 male pins and make sure your reading 14 ohms.
-If you read 0 then your wire harness on the inside of the diff to the solenoid actuator is busted.

My front diff solenoid read 0 ohms. Cracked the front diff cover and found the wire harness was completely broke. Replaced the harness $10 part from stealership and Service 4WD light went off instantly . Hope this helps The pic is the harness that sticks out the top of the diff. You can see the two wires that go into the inside of the diff an connect to the solenoid are completely cut off.
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  #20  
Old 12-05-2013, 09:31 AM
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Re: SERVICE 4WD SYSTEM Sensors

Subscribing for potential future use...
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  #21  
Old 12-05-2013, 09:50 AM
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Re: SERVICE 4WD SYSTEM Sensors

Quote:
Originally Posted by Drock970 View Post
I replaced all 4 of my wheel speed sensor with no luck with the 4WD light. I then read a ton of threads and found it was more then likely the wire harness for the solenoid on the inside of the front or rear diff.

-Hop under your jeep to the rear diff.
-At the top there is one wire connection and only one disconnect it.
-Throw some test leads on the sensors 2 male pins and make sure your reading 14 ohms.
-If you read 0 then your wire harness on the inside of the diff to the solenoid actuator is busted.

My front diff solenoid read 0 ohms. Cracked the front diff cover and found the wire harness was completely broke. Replaced the harness $10 part from stealership and Service 4WD light went off instantly . Hope this helps The pic is the harness that sticks out the top of the diff. You can see the two wires that go into the inside of the diff an connect to the solenoid are completely cut off.
Do all 4WD WKs have the diff sensors or is it only for the QDII systems? I only have the QDI. I'd look myself, but the Jeep is several miles from me at the moment.
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  #22  
Old 05-25-2015, 07:29 AM
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Re: SERVICE 4WD SYSTEM Sensors

My Jeep WK 08, 3.7 with 49709 mile.

I got recently Service 4WD systems message with 2 lights up in dashboard (ABS & ESP OFF).

Please advice.
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  #23  
Old 05-25-2015, 08:37 AM
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Re: SERVICE 4WD SYSTEM Sensors

I know it's been a while since I've posted to this topic but let me tell you what ultimately fix my service 4wd system problem. In the end it actually had nothing to do with the four-wheel-drive system. I had an extended warranty available to 80,000 miles and it was getting close to that so I wanted everything working 100% before it was no longer covered. Especially the 4wd system.

Two different dealers looked at my WK and still had not fixed the issue. Each use their magic dealer only scan tool to supposedly identify the real problem. Each time the error was gone and would stay off for a few days. Then back again, mildlay infuriating after the first two tries.

While we were waiting for a back ordered gear that engages the 4WD system I needed to get new tires. So I did. In the process the shop broke one of the tire pressure monitoring sensors. Which they offered to replace free of charge as they should, but twice they got the wrong part. So we went back to the dealer to get the right part and have them install it. While going through that process the 4WD error came back, which then ruled out a 3rd 4wd gear box.

So back-and-forth to the dealer three different times with different parts, software flashes, frankly I think a lot of confusion on their part. By the third trip they were just throwing parts at my WK. ultimately I believe it was an ABS sensor that failed. The was the last part they replaced before finally solving the issue. Strange thing was I never got an ABS error or light. Anyway after that I haven't seen the service 4WD system message. It's been a couple months and knock on wood I think it's good.
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  #24  
Old 05-27-2015, 04:26 AM
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Re: SERVICE 4WD SYSTEM Sensors

Be nice if that is all it is.
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