Question about 1993 Toyota 4Runner
The transmission is controlled by the Transmission Control Unit (TCU).
Throttle position, rpm, and speed are input parameters to the TCU. The TCU has a default set of shift patterns. These shift patterns change over time based on your specific vehicle setup and driving habbits.
The shift patterns are only slightly affected by driving habbits over many driving cycles. But, changing the relationship between the throttle position and the actual speed being reported by the speed sensor can have an immediate effect on shift patterns.
While your speedo may now be correct, the realtionship between rpm and thottle position has not been corrected. That would take a gear change in the differentials.
The TCU can be reset to an inital learn base line. When this is done, the TCU will instantly learn the dynamics of your setup.
Any shop with an advanced ODB scan tool can reset the the TCU. The dealer or a transmission shop would be preferable.
You really should change your differential gears as opposed to resetting the TCU
This information was posted by ftgiles here
Posted on Jan 06, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Dec 29, 2015 | Cars & Trucks
Jan 24, 2015 | 1993 Dodge Dakota
Jun 06, 2012 | 1999 Nissan Frontier
Jan 11, 2011 | Toyota 4Runner Cars & Trucks
Dec 19, 2010 | 1993 Toyota Paseo
Nov 07, 2010 | 2005 Dodge Dakota
Feb 17, 2010 | 1999 Toyota Camry
Aug 13, 2009 | 1988 Nissan Pathfinder
Mar 09, 2009 | 1993 Pontiac Firebird
751 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: