Ranger 4WD V6-3.0L VIN U (1997)
PROM - Programmable Read Only Memory: Customer Interest
A/T - High Engine RPM During Upshift/WOT Downshifts
Article No.
98-21-11
10/26/98
TRANSMISSION - 4R44E - HIGHER THAN EXPECTED
ENGINE RPMS DURING 2-3 UPSHIFT AFTER 3-2 OR
4-2 WIDE OPEN THROTTLE DOWNSHIFTS -
VEHICLES WITH 2.3L OR 3.0L ENGINE
LIGHT TRUCK:
1997 RANGER
This TSB article is being republished in its entirety to include the 2.3L engine.
CALIBRATION
Refer to the Recalibration Cross Reference Chart for correct calibration.
WARNING
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE(S). PERFORMING THIS MODIFICATION ON OTHER
ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.
ISSUE
Higher than expected engine rpms during a 2-3 partial backout upshift or after a 3-2 or 4-2 wide open throttle downshift may occur on some vehicles.
The engine races and may reach the engine rpm limiter. This may be caused by the Powertrain Control Module (PCM) calibration.
ACTION
Reprogram the PCM using the Service Bay Diagnostic System (SBDS) or New Generation Star (NGS) Tester. The revised calibration should reduce the
possibility of the above concern. Refer to the following Service Procedure for details.
SERVICE PROCEDURE
1.
Perform normal diagnostics as listed in the 1997 Ranger Service Manual.
2.
Repair all Diagnostic Trouble Codes (DTCs) as required.
3.
Check to verify that the vehicle does not have the latest calibration. If it does not, reprogram the PCM with the appropriate calibration using the
latest level CD-ROM. Refer to the Recalibration Cross Reference Chart for correct calibration.
NOTE
PCM REPLACEMENT IS NOT AUTHORIZED BY THIS TSB. REFER TO THE POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS
(PC/ED) SERVICE MANUAL FOR APPROPRIATE DIAGNOSTIC PROCEDURES IF PCM HARDWARE CONCERNS EXIST.
