A/T - 5R55W Harsh Light/Medium Throttle Upshifts
Article No.02-6-2
04/01/02
TRANSMISSION - 5R55W - HARSH UPSHIFTS DURING
LIGHT TO MEDIUM THROTTLE
FORD:
2002 EXPLORER
MERCURY:
2002 MOUNTAINEER
ISSUE
Some vehicles produced through 2/15/2002 equipped with the 5R55W automatic transmission may exhibit harsh 1-2, 2-3, 3-4 upshifts at light to medium throttle. This may be caused by the calibration of the Powertrain Control Module (PCM).
ACTION
Verify the condition. If the condition exists; reprogram the PCM with an updated calibration. If the condition persists after the reprogram, continue with normal diagnostics to pinpoint the condition. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
Verify that at light to medium throttle positions, the 1-2, 2-3 or 3-4 shift is harsh. Prior to performing any service procedures, verify tear tag information. Refer to the PCM Calibration Information Chart in this article. If the calibration is not at the latest level, follow the procedures found in the Powertrain Control/Emissions Diagnosis (PC/ED) Service Manual to reprogram the PCM to latest calibration level.
After reprogramming has been completed, the transmission adaptive strategy for pressure control on engagements must be updated.
Install diagnostic equipment and monitor the Transmission Fluid Temperature (TFT).
Warm the transmission fluid to at least 54°C (130°F) as indicated by the TFT.
^ Perform five (5) engagements from Park to Reverse. Each engagement must be 5 seconds apart.
^ Perform five (5) engagements from Drive to Reverse. Each engagement must be 5 seconds apart.
^ Perform five (5) engagements from Reverse to Drive. Each engagement must be 5 seconds apart.
^ Perform five (5) engagements from Neutral to Drive. Each engagement must be 5 seconds apart.
NOTE
ALL OF THESE ENGAGEMENTS MUST BE PERFORMED IN ORDER FOR THE ENGAGEMENT PRESSURES TO PROPERLY ADAPT WITH THE NEW CALIBRATION.
Verify repair. If the condition is not corrected, continue with normal diagnostics and repair per the Workshop Manual.
Obtain an Authorized Modifications Decal (FPS 8262 - obtainable through DOES II, 25/pkg) and list the date, dealer number, and summary of modifications performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.
WARRANTY STATUS:
Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
020602A Reprogram Powertrain 1.6 Hrs.
Control Module (Includes
Time To Update
Transmission Adaptive
Strategy)
DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 42
OASIS CODES: 501000, 502000