Mountaineer AWD V8-4.6L SOHC VIN W (2002)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
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.
