Tip of the Month – April 2019

Ford® vehicles with electronically controlled automatic transmissions can have a variety of transmission shifting and engagement problems when there is actually nothing wrong with the transmission itself.

The cause for these types of problems is typically one or more of the following:

  • contaminated Mass Air Flow Sensor
  • shift adapt memory has not been cleared
  • “Re-flash”, “Calibration Update”, or Software Update is necessary to correct software problems with transmission control.

A contaminated Mass Air Flow sensor will skew fuel trim, engine load calculations, and affect transmission shifting and pressure control. As a general rule, it’s a good idea to clean the Mass Air Flow sensor and “brain dead”, or clear the computer on any Ford vehicle that has a suspected transmission problem, or after installing a rebuilt transmission. Which brings us to our next subject: clearing shift adapt memory.

On Ford vehicles with electronic transmissions, the computer adapts transmission pressure control and clutch apply timing to compensate for wear, manufacturing tolerances, and driving conditions. The adaptive information stored in the computer can be skewed enough to cause shifting problems, and the computer may not ‘relearn’ properly until it is reset to base values.

To clear the computer, or “brain dead” a Ford vehicle, disconnect the battery and hold the Positive and Negative battery cable ends together. Turn the key to the RUN position; hold the brake pedal down for about 10 seconds. Let the vehicle sit for about 10 minutes, then turn the key OFF and reconnect the battery.

Numerous software updates have been released for Ford vehicles to fix transmission shifting and operation problems. Leon’s Transmissions can “Reflash” or update the PCM calibration on any reprogrammable Ford vehicle. For more information, call your local Leon’s representative today!

The Funny Side

Ed was in trouble. He forgot his wedding anniversary. His wife was really angry. She told him, ‘Tomorrow morning I expect to find a gift in the driveway that goes from 0 to 200 in less than 10 seconds…AND IT BETTER BE THERE!’
The next morning Ed got up early and left for work. When his wife woke up she looked out the window and sure enough there was a box gift-wrapped in the middle of the driveway. Confused, she put on her robe and ran out to the driveway, and brought the box back in the house. She opened it and found a brand new bathroom scale. Ed has been missing since Friday.