Thunderbird V8-281 4.6L SOHC (1994)
Powertrain Control Module: Customer Interest
A/T - Delayed/Slow/Soft Upshifts
Article No.
95-8-3
04/24/95
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TRANSMISSION - 4R70W - DELAYED/SLOW/SOFT OR HESITATION/SAG ON 1-2 AND/OR 3-4 UPSHIFTS - 3.8L AND 4.6L ENGINES
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TRANSMISSION - 4R70W - SERVICE TIP FOR INSTALLING A FORD AUTHORIZED REMANUFACTURED TRANSMISSION - PCM
REPLACEMENT REQUIRED
FORD:
1994 THUNDERBIRD
LINCOLN-MERCURY:
1994 COUGAR
This TSB is being republished in its entirety to update the Service Procedure to allow for PCM reprogramming and to include references to follow if
installing a Ford authorized remanufactured transmission.
CALIBRATION:
4-16F-R00, 4-16F-R10, 4-16T-R00, 4-16T-R10, 4-18A-R05, 4-18A-R11, 4-18B-R05, 4-18B-R10, 4-18P-R05, 4-18P-R10, 4-18A-R10.
WARNING:
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE
CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.
ISSUE:
A delayed/soft/slow concern may occur during the 1-2 upshift (3.8L engine only), and a "hesitation or sag" during 3-4 upshift (3.8L and 4.6L engines).
This is caused by the 1994 shift calibration in the Powertrain Control Module (PCM) and Transmission Main Control Assembly. The calibration is
revised for the 1995 model year to reduce the previously-mentioned conditions. If replacing transmission with a Ford authorized remanufactured
transmission, the following Service Procedure must be followed or damage to the transmission could occur.
ACTION:
Refer to the following Service Procedure if any of the previously-mentioned concerns exist. If a Ford authorized remanufactured transmission is being
installed, follow the Service Procedure with the exception of replacing the main control.
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4.6L Engine - Reprogram or replace the PCM with the 1995 calibration (see Application Charts) and replace the Transmission Main Control
Assembly with the revised 1995 part. Refer to the following Service Procedure.
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3.8L Engine - Replace the PCM with the 1995 calibration (see Application Charts) and replace the Transmission Main Control Assembly with the
revised 1995 part. Refer to the following Service Procedure.
CAUTION:
THE PCM RECALIBRATION OR REPLACEMENT AND TRANSMISSION MAIN CONTROL ASSEMBLY CHANGES MUST BE DONE
TOGETHER OR TRANSMISSION OVERDRIVE BAND DAMAGE WILL RESULT. DO NOT USE THE 1994 MAIN CONTROL ASSEMBLY
WITH THE 1995 PCM CALIBRATION, OR THE 1994 PCM CALIBRATION WITH THE 1995 MAIN CONTROL ASSEMBLY.
CAUTION:
IF INSTALLING A FORD AUTHORIZED REMANUFACTURED TRANSMISSION WITH A 1995 LEVEL MAIN CONTROL, THE PCM
CALIBRATION MUST BE CHANGED TO THE 1995 LEVEL. THE FORD AUTHORIZED REMANUFACTURED TRANSMISSION WITH
THE 1995 LEVEL MAIN CONTROL WILL BE TAGGED TO INDICATE THE 1995 LEVEL MAIN CONTROL HAS BEEN INSTALLED.
FAILURE TO UPDATE THE PCM COULD RESULT IN DAMAGE TO THE FORD AUTHORIZED REMANUFACTURED TRANSMISSION.
THE MAIN CONTROL WILL NOT HAVE TO BE REPLACED. THE UPDATED MAIN CONTROL IS INCLUDED WITH THE FORD
AUTHORIZED REMANUFACTURED TRANSMISSION. REFER TO THE SERVICE PROCEDURE FOR DETAILS.
SERVICE PROCEDURE
1.
Perform normal diagnosis and repair any concerns found. Refer to 1994 Powertrain Control/Emissions Diagnosis (PC/ED) Car/Truck Service
Manual for diagnosis procedures and repair.
2.
Use the appropriate step for the specific engine.
