Explorer Sport Trac 2WD V6-4.0L VIN E (2002)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
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).