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Glenn
Glenn, Senior Master Ford Tech
Category: Ford
Satisfied Customers: 1745
Experience:  26 years exp with Ford Products, ASE Master Auto & Truck + advanced engine perf L1/L2 Gas & Diesel
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1995 Ford Explorer: liter..code reader..a rebuilt tranny, 40 K miles

Resolved Question:

1995 Ford Explorer auto 4 liter. The overdrive light flashes from time to time, can be reset via code reader or removing battery cable. Car has a rebuilt tranny, 40 K miles ago...rebuilt for the same reason. I do not believe there is a mechanical problem with the trans..it runs and shifts fine. The issue is electronic. where should I look?

I know there is a bulletin out there on this vehicle TSB 98-5-16 but I have been unable to see what it says.

Your help appreciated!
Submitted: 6 years ago.
Category: Ford
Expert:  Glenn replied 6 years ago.

hello there,

Your not going to like the TSB but here it is.. That other tsb in 97 is a servo piston, which hopefully got replaced during the overhaul. Compare what codes you get to the 2 tsb's

 

TSB
98-5-16
  • TRANSMISSION - 4R44E/4R55E - O/D OFF LAMP FLASHING AND/OR DIAGNOSTIC TROUBLE CODES (DTCS) 645, 646, 647, 648 STORED IN MEMORY
Publication Date: MARCH 16, 1998

LIGHT TRUCK:1995 EXPLORER

This TSB article is being republished in its entirety to update the Service Procedure.

CALIBRATION:

5-58B-R10, 5-58R-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:

Some vehicles may experience a flashing "O/D OFF" lamp and/or the following Diagnostic Trouble Codes (DTCs) may occur: 645, 646, 647, 648. This may be caused by a damaged intermediate and/or overdrive servo piston seal, faulty Throttle Position (TP) sensor wiring or a concern with the transmission control strategy.

ACTION:

Follow the diagnostic procedures listed in the 1995 Explorer Service Manual and the following text for details.

Service all non-transmission DTCs and concerns first.

Service all transmission DTCs and concerns except for DTCs 645, 646, 647, 648.

For the above DTCs, follow TSB 97-17-24 making sure that the Electronic Pressure Control (EPC) solenoid is functional, transmission bands are adjusted properly, and the servos are not damaged.

Check the TP sensor wiring, wiring crimps, and peform a wiggle test.

If after checking the transmission and TP wiring no problems were identified, verify the vehicle has the latest level calibration. If it does not, replace the Powertrain Control Module (PCM). Refer to the following PCM Application Chart for correct PCM usage.



PCM APPLICATION
Old CalibrationOld Part Number (-12A650-)New CalibrationNew Part Number (-12A650-)
5-58B-R10F5TF-ARC5-58B-R10F5PF-BRA
5-58R-R10F5TF-ATC5-58R-R10F5PF-BSA

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.




PART NUMBERPART NAME
F5PZ-12A650-BRAPowertrain Control Module (PCM)
F5PZ-12A650-BSAPowertrain Control Module (PCM)

OTHER APPLICABLE ARTICLES:

95-19-12, 97-17-24

SUPERSEDES:

98-3-21

WARRANTY STATUS:

Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATIONDESCRIPTIONTIME
980516AReplace Powertrain Control Module (PCM)0.3 Hr.

 

CLICK ON PICTURE FOR OTHER TSB>>

 

graphic

Glenn, Senior Master Ford Tech
Category: Ford
Satisfied Customers: 1745
Experience: 26 years exp with Ford Products, ASE Master Auto & Truck + advanced engine perf L1/L2 Gas & Diesel
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