Buy Now | Log In | ALLDATA Corporate Site | AutoZone.com
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
 
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
   
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
If you have any questions, please feel free to email us.
 
 

Miscellaneous
Acura
Audi
Buick
Cadillac
Chevy
Chrysler

Dodge/Plymouth
Ford
GMC
Geo
Hyundai
Honda
Isuzu

Jeep
Lexus
Lincoln - Mercury
Mazda
Mercedes
Mitsubishi
Nissan
Oldsmobile
Pontiac
Saturn
Subaru
Toyota
Volkswagen
 
   
  Jim Grant's Tech Tips

‘98 Ford Expedition, Blinking O/D Light

Q: I recently purchased a '98 Ford Expedition with 72,000 miles on it. While on a long trip, the O/D light on the automatic shifter started blinking. It doesn't blink all the time. The transmission seems to shift a little harder when the light's blinking. The fluid is very clean and the level is good. Is there any info on what causes the blinking O/D light?

- Don Hall

A: The switch on the end of your vehicle's shifting lever is called a Transmission Control Switch {TCS). When the Over Drive (O/D) indicator lamp is off, the vehicle's computer allows the transmission to shift automatically from 1st through to 4th gear. When the O/D light is on the vehicle's computer allows the transmission to shift from 1st through only to 3rd preventing the shift to 4th gear. When the O/D indicator lamp is blinking, it is telling you that there is an electronic pressure control problem or that there is a sensor problem. If there is a pressure or sensor problem, the computer activates an alternative program. This program is often called a limp mode program. When a limp mode is activated, the shifting and internal transmission operating pressures are changed, which explains the change in shifting that you refer to. An easy way to view this mode/program is as a fail safe to get the vehicle home without leaving you stuck on the side of the road, thus limp mode. You should take the vehicle to a repair facility and have the computer checked for codes. The computer codes will tell the technician what system or sensor is being affected. From that point the diagnosis and repairs can be performed. Don't ignore the limp mode warning! Get it checked out early and repaired before limp mode becomes walk home mode.

 
     
Have any Questions About ALLDATAdiy.com? Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program