B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
PROM - Programmable Read Only Memory: Customer Interest
Engine Controls - High Engine RPM's on A/T 2 -3 Shift
M05-001/99
1997 B-Series - HIGH ENGINE RPM DURING 2-3 UPSHIFT OR AFTER 4-2 WOT DOWNSHIFT
APPLICABLE MODELS
All 1997 B-2300 with automatic transmissions.
DESCRIPTION
Higher than expected engine RPMs may occur on some vehicles during a 2-3 partial upshift or after a 3-2 or 4-2 WOT (wide open throttle) downshift.
The engine races and may reach the engine RPM limiter. This may be caused by the PCM (Powertrain Control Module) calibration. An updated PCM is
available to reduce this concern.
Customers complaining of this concern should have their vehicle repaired according to the following procedure.
NOTE:
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.
REPAIR PROCEDURE
1.
Verify customer complaint.
2.
Perform normal diagnostics as listed in the 1997 B-Series Workshop Manual section K.
3.
Repair all DTCs (Diagnostic Trouble Codes) as required. If problem still exists, replace PCM with an updated part.
4.
Verify repair.
PARTS INFORMATION
