transmission starts shifting erratically

1996 FORD TAURUS
100,000 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
ROB WESTON
  • MEMBER
  • 1 POST
once the car warms up the transmission starts shifting erratically and the speedometer stops working changed the speed sensor no difference. any help would be appreciated.
Apr 29, 2017 at 4:00 AM
Advertisement
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello Bob,

This sound like the PCM is going out but to be sure here is a wiring diagram and a guide and a diagram so you check check the wiring to the PCM and the speed sensor, there is nothing in between the sensor wires and the PCM.

https://www.2carpros.com/articles/how-to-check-wiring

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Apr 13, 2021 at 8:08 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.