A/T Controls - Harsh Downshift Above 50 MPH at High Altitude
TSB 12-12-312/07/12
HARSH DOWNSHIFT AT SPEEDS ABOVE 80 KM/H (50
MPH) - IN ELEVATION ABOVE 1829 METERS (6000
FEET)
FORD:
2011 Expedition
LINCOLN:
2011 Navigator
ISSUE
Some 2011 Expedition and Navigator vehicles may exhibit a harsh downshift at speeds 80 Km/h (50 MPH) and in elevations above 1829 meters (6000 feet) or higher.
ACTION
Follow the Service Procedure steps to correct the concern.
SERVICE PROCEDURE
1. Install Integrated Diagnostic System (IDS) or equivalent and ID vehicle.
2. Reprogram the powertrain control module (PCM) and transmission control module (TCM) calibration using IDS release 82.01 and higher. This new calibration is not included in the VCM 2012.11 DVD. Calibration files may also be obtained at the website.
a. Calibration updates can be viewed from the tech log view screen on IDS after programming has been completed.
NOTE
THE TCM CANNOT BE INDEPENDENTLY REPROGRAMMED, REPROGRAM USING THE PMI FUNCTION TO ENSURE THAT ENGINE AND TRANSMISSION CALIBRATIONS ARE UPDATED TO THE LATEST LEVEL SIMULTANEOUSLY.
NOTE
IT IS CRITICAL THAT TCM KEEP ALIVE MEMORY (KAM) BE CLEARED FOR THIS PROCEDURE TO BE FULLY EFFECTIVE.
3. Clear TCM KAM and adaptive tables using IDS scan tool.
a. Open Toolbox
b. Choose Powertrain
c. Choose Reset KAM
d. Choose TCM
NOTE
DISCONNECTING THE BATTERY WILL NOT CLEAR THE 1CM KAM. IT IS CRITICAL THAT TCM KAM BE CLEARED PRIOR TO RELEARNING THE ADAPTIVE TABLES FOR THE TRANSMISSION.
NOTE
DO NOT CLEAR THE PCM KAM.
4. Verify that the transmission fluid temperature (TFT) PID is above 80 °C (175 °F). If it is not at 80 °C (175 °F), drive unit approximately 5 Km (3 miles) to reach temperature.
NOTE
TFT MUST BE AT 80 °C (175 °F) OR ABOVE BEFORE PROCEEDING TO STEP 5.
NOTE
PERFORM ADAPTIVE SHIFT STRATEGY LEARN ON LEVEL SURFACE ROAD.
5. Drive unit to perform adaptive shift strategy learn.
a. Accelerate from a stopped position with light throttle to 24 Km/h (15 MPH) and remove foot from accelerator pedal.
b. Brake very gently to a complete stop (allow at least six (6) seconds).
c. Repeat steps (a-b) five (5) times in the dealership parking lot or similar setting.
d. Accelerate from rest with light throttle ensuring that the 1-2, 2-3 and 3-4 shifts occur at engine speeds between 1700-2000 RPM.
e. Continue to accelerate until you achieve 80 Km/h (50 MPH) or the 5-6 upshift.
f. Brake gently to a complete stop and hold foot on brake for ten (10) seconds.
g. Repeat steps (d-f) three (3) times.
NOTE
SEVERAL DAYS OF DRIVING ARE REQUIRED FOR THE TRANSMISSION TO FULLY ADAPT.
NOTE
PLEASE ADVISE THE CUSTOMER THAT THIS VEHICLE IS EQUIPPED WITH AN ADAPTIVE TRANSMISSION SHIFT STRATEGY WHICH ALLOWS THE VEHICLE'S COMPUTER TO LEARN THE TRANSMISSION'S UNIQUE PARAMETERS AND IMPROVE SHIFT QUALITY. WHEN THE ADAPTIVE STRATEGY IS RESET, THE COMPUTER WILL BEGIN A RE-LEARNING PROCESS. THIS RE-LEARNING PROCESS MAY RESULT IN FIRMER THAN NORMAL UPSHIFTS AND DOWNSHIFTS FOR SEVERAL DAYS
WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage Warranty/ESP coverage limits/policies/prior approvals are not altered by a TSB. Warranty/ESP coverage limits are determined by the identified causal part and verified using the OASIS part coverage tool.
OPERATION DESCRIPTION TIME
121203A 2011 Expedition, 1.0 Hr.
Navigator: Reprogram The
PCM And TCM, Includes
Time To Perform Adaptive
Shift Strategy Learn (Do
Not Use With Any Other
Labor Operations)
DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 04
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