A/T - MIL Flashing, DTC'S P0741 And P1728 Set

Article No.
01-5-4

March 19, 2001

^ ELECTRICAL - LAMP - TRANSMISSION CONTROL
^ INDICATOR LAMP (TCIL) ILLUMINATED -
^ DIAGNOSTIC TROUBLE CODE (DTC) P0141
^ AND/OR P1728 - VEHICLES EQUIPPED WITH 5.0L
^ ENGINE AND 4R70W TRANSMISSION ONLY

^ TRANSMISSION - 4R70W - TRANSMISSION
^ CONTROL INDICATOR LAMP (TCIL)
^ ILLUMINATED - DIAGNOSTIC TROUBLE CODE
^ (DTC) P0741 AND/OR P1728 - VEHICLES EQUIPPED
^ WITH 5.0L ENGINE AND 4R70W TRANSMISSION ONLY

FORD:
1998-2001 EXPLORER

MERCURY:
1998-2001 MOUNTAINEER

ISSUE

Some vehicles may exhibit a flashing Transmission Control Indicator Lamp (TCIL) accompanied by a Diagnostic Trouble Code (DTC) P0741 and in some cases P1728. This may be caused by the Output Shaft Speed Sensor (OSS) signal being improperly processed by the Powertrain Control Module (PCM).

ACTION

Retrieve DTCs. Verify DTC P0741 and in some cases P1728. Diagnose and reprogram the PCM if necessary. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Verify transmission fluid levels (and transfer case level if equipped).

2. Verify that DTC P0741 and in some cases P1728 are present. If other DTCs are present, repair them first.

3. Follow the Output State Control (OSC) procedures for both bench and drive modes as listed in the appropriate model year Workshop Manual (Section 307-1A) to verify transmission and solenoid operation. While in OSC drive mode, monitor OSS Sensor - OSS PID for proper signal as stated in the Workshop Manual. This will verify OSS operation. If the solenoids or transmission fail to perform properly, follow normal diagnosis and repair procedures.





4. Reprogram the PCM following the procedures found in the Powertrain Control/Emissions Diagnosis (PC/ED) Workshop Manual. Refer to the PCM Calibration Information Chart shown.

5. Verify the repair following the Transmission Drive Cycle test as written in the appropriate model year Workshop Manual. (Section 307-1A).

NOTE:
THE TRANSMISSION DRIVE CYCLE TEST MUST BE PERFORMED EXACTLY AS WRITTEN. DO NOT SHORT CUT OR MISS ANY STEPS OR THE PROCEDURE WILL NOT BE ABLE TO VALIDATE THE REPAIR.





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: Information ONLY
OASIS CODES: 204000, 206000, 504000