Location of Speedometer Sensor ?

[suniku55]

My speedometer stopped working since last year and I found this part on the eeuroports.com.

where this Speedometer Sensor located?

http://eeuroparts.com/productdetail....ts=1&code=8662

(I am not sure if this part caused my faulty speedometer but I like to see if this part looks ok on my car.)

[earthworm]

There is no "speedometer sensor" as such.
http://www.saabcentral.com/forums/sh...dometer+Sensor

The ABS uses the signal from the RR hub sensor, this is transmitted to the speedometer..
Correction , its the left side..
As part of the "high mileage" service, this area at all four wheels needs to be free of dirt and corrosion, the connections good and the ABS harness secure...
I used "search", hard to remember if it is the RR or the LR hub; many have trouble here, particularly if no service work is ever done..

[Diosnoche]

First things first, do you have an ABS light on as well?

Check to see if the cruise control works also.

The Speedo signal is taken from the Left Rear ABS wheel speed sensor, the speedo itself gets the signal from the ABS module, as does the cruise control.

[suniku55]

Thanks!
No ABS light and tell you the truth, I haven't had used cruise control since I bought my saab, not even once! I should test that sometime when I have a chance to drive out from this perennially congested NJ area.
I will check Left Rear ABS wheel speed sensor when I do brake job this fall.

[Diosnoche]

Brake job this fall? you're gonna drive around for 2 months without a speedo?

[untakenname]

as a stop gap you can get gps units that also have a speedometer function and it should be more accurate then the car when at a constant speed.

[Diosnoche]

I was thinking more about the odometer reading, the car won't have the correct reading if the speedo is left broken for that long.

Actually, does your odometer and trip odometer work? Just wondering if the speedometer only is broken.

[suniku55]

I don’t know how seedo and odometer is getting signal from where (same or two different sensors?) but my speedo hasn’t working for a year and strangely enough, my odometer is working fine as well as trip mileage set.

I used frequently to measure the accurate MPG since I haven’t seen a fully displayed numbers on my swiss cheese like missing pixeled SID.

(http://www.saabcentral.com/forums/showthread.php?p=1027205#post1027205)

[suniku55]

[QUOTE=earthworm]There is no "speedometer sensor" as such.
http://www.saabcentral.com/forums/sh...dometer+Sensor

QUOTE]


I sent an email to eEuroparts.com to ask the location of Seedometer sensor part listed on their page as Part Code: 8781932 Part Name: Speedometer Sensor (A/T).

Customer service, Todd Morin, replied promptly just now. see below.
I think I will take a look to see this horribly expensive $120 sensor on the transmission to see if there is a piece of gold or diamond in it....
I am still in the troubleshooting mode to locate the problem.

================================================== =======
On the transmission, firewall side.

Thanks
Todd Morin
eEuroparts.com
4 Ridge Road
Putnam, CT 06260
860-963-0038
860-963-9404
todd@eeuroparts.com

-----Original Message-----
Sent: Friday, August 10, 2007 10:50 AM
To: customerservice@eeuroparts.com
Subject: Speedometer Sensor location

where this Speedometer Sensor located on my 1997 Saab900S non/turbo?
http://eeuroparts.com/productdetail.aspx?searchResults=1&code=8662
================================================== ======

[Diosnoche]

Well if the odometer is working then only the speedo module is defective, not the speed sensors or anything else.

If the speed sensor was at fault, you would have an ABS light, no cruise control, and the odometer would not work as well.

[Diosnoche]

Originally Posted by suniku55

I sent an email to eEuroparts.com to ask the location of Seedometer sensor part listed on their page as Part Code: 8781932 Part Name: Speedometer Sensor (A/T).

Customer service, Todd Morin, replied promptly just now. see below.
I think I will take a look to see this horribly expensive $120 sensor on the transmission to see if there is a piece of gold or diamond in it....
I am still in the troubleshooting mode to locate the problem.

================================================== =======
On the transmission, firewall side.

I think buddy Todd might be a little confused, the only speed sensors mounted on the Transmission itself are the input shaft speed sensor, and the Output shaft speed sensor. The other sensor is a Transmission fluid temperature sensor. The input/output shaft speed sensors aren't used for the speedo, their used by the TCM.

Yeah that's the wrong part man, according to EPC, 87 81 932 is the output shaft speed sensor and the input shaft speed sensor. These sensors are used to calculate the shifting times

[suniku55]

Originally Posted by Diosnoche

Well if the odometer is working then only the speedo module is defective, not the speed sensors or anything else.

If the speed sensor was at fault, you would have an ABS light, no cruise control, and the odometer would not work as well.

Thanks! This is clear to narrow down the problem.
When you refer 'The speedo module', you mean the unit on the dashboard with numeric speed marked on?
Can this be replaced easily?

This might be an answer to solve my another problem bugged me a year long!
As soon as my speedo stopped working last year, I began to hear hissing sound deep inside the dashboard behind speedo meter when the car travels over 60mph especially louder in summer time with air conditioner on.
I thought it was another seperate problem I need to tackle down after I fix the speedo meter problem but it looks somewhat related.

Thanks!

[suniku55]

Thanks for clarification.
That speed sensor must be refering to transmission speed.

[dcoutofstep]

Have a similiar issue. Speedometer & Odometer don't work. Have the ABS light, and it says "Brake Light Failure" when the brake lights work. Would a simple cleanning of the speed sensor and connection on the RL hub clear up the issue?