Engine Controls, A/T - Harsh/Shuddering Shifting
Article No.02-18-5
09/16/02
TRANSMISSION - 5R55S - SHUDDER DURING 4/5
UPSHIFT AND 5/4 DOWNSHIFT OR HARSH 2-3
UPSHIFT DURING THROTTLE BACKOUT - VEHICLES
BUILT 2/15/2002 THROUGH 8/19/2002 EQUIPPED
WITH 4.6L ENGINE ONLY
FORD:
2002 EXPLORER
MERCURY:
2002 MOUNTAINEER
ISSUE
Some vehicles equipped with 4.6L engine and 5R55S automatic transmission built 2/15/2002 through 5/15/2002, may exhibit a shudder during 4/5 upshift and/or 5/4 downshift, or vehicles built between 5/15/2002 through 8/19/2002 may exhibit a harsh 2-3 throttle backout upshift. This may be caused by the Powertrain Control Module (PCM) calibration.
ACTION
Verify the condition and reprogram the PCM. If the condition is not corrected after reprogramming, continue with normal diagnostics to pinpoint the cause. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
Verify that one or both of the conditions exists:
1. A shudder exists only during a 4-5 or 5-4 shift and or,
2. A harsh 2-3 upshift occurs only when backout of the throttle.
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 130° F (54° C 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.
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
021805A Verify Concern If Present 1.7 Hrs.
Reprogram The PCM To
The Lastest Level.
Removal Of PCM To
Retrieve Tear Tag
Information And Relearning
Of Transmission Adaptive
Strategy Included.
DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 42
OASIS CODES: 501000, 502000