Replacing AWD speed sensors
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More Turbo
Joined: Mar 2002
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From: Colstrip, MT
Replacing AWD speed sensors
I am going to replace the speed sensors on my '95 AWD that are located on the transfer case. Can somebody tell me if this is simply a plug and play operation, or is it more involved than that?
I don't seem to be getting the transfer of power to the front wheels. There are no trouble codes and researching this forum indicated that a bad speed sensor would not throw a code.
I can lift all four wheels off the ground at the same time, and when I turn one wheel, they all turn, so I know the 70/30 power split is still operational.
I don't seem to be getting the transfer of power to the front wheels. There are no trouble codes and researching this forum indicated that a bad speed sensor would not throw a code.
I can lift all four wheels off the ground at the same time, and when I turn one wheel, they all turn, so I know the 70/30 power split is still operational.
Postmaster
Joined: Sep 2003
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From: Southern California
Check and make sure that the AWD computer under the driver's seat is plugged in.
There are two sensors on the TC, one for the front and one for the rear. They are identical and can be checked once removed from the TC. Removing them is easy. Just remove the electric plug and one retaining bolt for each sensor. Each sensor has three pins. Measure the resistances between each pair. They should read about 1000, 2000 and 3000 Ohms. If not, you need to replace them. If the resistances check out OK, they are not your problem, you have to look elsewhere.
There are two sensors on the TC, one for the front and one for the rear. They are identical and can be checked once removed from the TC. Removing them is easy. Just remove the electric plug and one retaining bolt for each sensor. Each sensor has three pins. Measure the resistances between each pair. They should read about 1000, 2000 and 3000 Ohms. If not, you need to replace them. If the resistances check out OK, they are not your problem, you have to look elsewhere.
Posting Guru
Joined: Jul 2004
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From: Mitchell, SD
Originally Posted by fatherdoug
I don't seem to be getting the transfer of power to the front wheels.
I would go ahead and check the speed sensors, but I don't think that would be your problem. If it was, your 4wd light would be on or blinking along with other issues.
You also have to remember that this is not a true 4x4 so it might have some quirks you are not use to with a traditional transfer case and locking hubs.
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More Turbo
Joined: Mar 2002
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From: Colstrip, MT
Thanks for the replies. Copper, one of the sensors is bad according to your troubleshooting info. Nighthawk, I am basing my statement on the fact that this is the third AWD aerostar that I have owned, and this one behaves entirely different on poor road conditions. This aerostar tends to drive like a rear wheel drive. I can get the van to fishtail much more easily than I could with the other vans. All I have to go on is my experience with the other two vans. Sliding down the road while being perpindicular to a snow plow has me wondering why this van is different. The module is plugged in.
Postmaster
Joined: Sep 2003
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From: Southern California
Hi Doug:
There is this outfit in Oakland, CA at www.transfercases.com. Get on their site to get the 800 number and call them up. They gave me a quote of $20 each and the shipping charge is about $10 UPS. Make sure you tell them it's the Dana 28 Transfer Case. The dealers here want $115 for a new one, which is rather ridiculous, in my opinion.
By the way, what were the resistances for each sensor?
There is this outfit in Oakland, CA at www.transfercases.com. Get on their site to get the 800 number and call them up. They gave me a quote of $20 each and the shipping charge is about $10 UPS. Make sure you tell them it's the Dana 28 Transfer Case. The dealers here want $115 for a new one, which is rather ridiculous, in my opinion.
By the way, what were the resistances for each sensor?
Lead Driver
Joined: Sep 2003
Posts: 7,015
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From: SoCal
Copper,
Are you sure that $115 is for one of the two TC sensors? The last time I checked, they were $38 each, which while pricy, were not outrageous. There is a bigger sensor that costs close to $100, but there's only one of those. I think that's the speedometer sensor, but I can't remember for sure.
Oh yes, the sensor on the rear diff was about $20 at the dealer. So here's what I remember about the prices for each of the 3 different sensors: $20, $40, and $80.
Are you sure that $115 is for one of the two TC sensors? The last time I checked, they were $38 each, which while pricy, were not outrageous. There is a bigger sensor that costs close to $100, but there's only one of those. I think that's the speedometer sensor, but I can't remember for sure.
Oh yes, the sensor on the rear diff was about $20 at the dealer. So here's what I remember about the prices for each of the 3 different sensors: $20, $40, and $80.
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