The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

Strange Speedo Behavior 900

posted by  tvpierce on  Sun Jan 17 02:28 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Apr 8 06:40 CST 2014
[RELATED]

'93 945T, 260K miles.

I had the speedo out to repair the trip odometer -- a piece of the plastic reset mechanism was broken, and I was able to repair it with hot glue.

For archive purposes, I've attached a pic that shows the solder joints I needed to de-solder in order to remove the board. The red circles are the joints that must be de-soldered, the yellow circles are optional. Arrows are the two screws that need to be removed.

So I get it all back together and the trip odometer works fine now -- but I've screwed something up with the speedo. The speedo reads zero mph when stopped -- which is good. But when I begin moving, and get to about 5mph, the needle immediately jumps to 40mph and stays there regardless of actual speed -- so whether I'm going 10mph or 90mph, the speedo stays at 40.

Any thoughts on what's causing this, and/or how to remedy it? Also, how does the speedo work? I presume it's electrical impluses from similar to the flywheel sensor or the ABS sensor.

'93 945T Speedo Circuit Board

Thanks in advance for your help.
--
Jeff Pierce (Post back with your results... it's what makes this forum work.)







USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.