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



 VIEW    REPLY TO THIS MESSAGE    PRINT   SAVE 

ok now I am going crazy - help 700 1992

posted by  RobCooper on  Mon Jan 25 21:24 CST 2010
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue May 13 17:31 CST 2014
[RELATED]

So after getting my speedo and tach working on my 91 744 rex, the speedo in my 92 745 T just went out. Like I need something to do.

needle and odometer/trip are out. I went thru the speedo circuits and checked all the capacitors with the DMM. One was bad so it got replaced. That did not do it.

I really need the odometer to work b/c the fuel gauge gets stuck (next ordeal)

I broke open that security black box that houses the speedo sensor male female connection, the one behind the drive side rear wheel well.

I disconnected the junction and did the '4 shorts per second' method per FAQ to the speedo end. No needle movement up front on the speedo. The car was running during this. OK, this means bad speedo - right?

Ground on the footwell is good. Wires are good.

I then put the connection together back in the back box.

Next, I hook up the 10V AC DMM to the #1 and #2 sensor leads on the 4 pin speedo connector to see if the voltage goes up when I drive it. Nada! What is going on?

The ohms on the sensor is approx 700 ohms. This fluctuates up to 1k when moving.

Next, I will swap the rebuilt clusters between cars and see then.

And one more thing. I checked the '4 shorts per second' trick on the good 91 car. I put needles into the two wires just before the black box, connected some wire leads and did the shorting after running the car. NADA, but this car is good. However, I did not disconnect the sensor lead this time. Does that make the difference?

Any ideas folks?

Rob






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.