SPONSORED LINKS

1989 Chevy Cavalier Trouble code 24

Tiny
AZTROPIC
  • MEMBER
  • 1989 CHEVROLET CAVALIER
Computer problem
1989 Chevy Cavalier 6 cyl Front Wheel Drive Automatic 190K miles

1989 Chev cavalier Z24 2.8 automatic always sets code 24(VSS) after it is warmed up, and within 3 to 5 seconds after coasting above 50 MPH (digital dash) Over the years, I have replaced every possible sensor including a different throttle body and computer with absolutely no change. Begining to suspect something mechanical like a broken or grounded wire or vacuum leak. Any ideas? Any list of conditions that need to be met before triggering code 24?
aztropic
SPONSORED LINKS
Sunday, August 29th, 2010 AT 12:55 PM

4 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
With DVOM on AC scale mearure voltage across VSS sensor on transaxle. Jack up in gear if voltage present then check at ECM
Was this
answer
helpful?
Yes
No
+1
Sunday, August 29th, 2010 AT 1:44 PM
Tiny
AZTROPIC
  • MEMBER
  • 3 POSTS
Nope! Definately not a computer problem. Tried a brand new one and a known good one from a friends car with the exact same results.
Would be interested in knowing the parameters that cause a code 24 to be set.(Vehicle speed, voltage at throttle position sensor etc.)
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Sunday, August 29th, 2010 AT 11:04 PM
Tiny
AZTROPIC
  • MEMBER
  • 3 POSTS
Will check for AC voltage at ECM. (Digital dash speedometer works fine) Thought speedometer # MPH was created by the ECM from VSS voltage signal?
Was this
answer
helpful?
Yes
No
Sunday, August 29th, 2010 AT 11:22 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Only two things set code 24 faulty VSS or PROM


https://www.2carpros.com/forum/automotive_pictures/198357_Graphic_589.jpg

Was this
answer
helpful?
Yes
No
+1
Monday, August 30th, 2010 AT 1:58 PM

Please login or register to post a reply.

Related OBD1 Code 24 Content

Sponsored links