Engine - High Rpm's On A/T Upshift

Bulletin No. 001/99
Issued 03/04/99
Revised

Section
K (05)

Applicable Model/s
1997 B-Series

Subject
HIGH ENGINE RPMS DURING 2-3 UPSHIFT
OR AFTER 3-2, OR AFTER 4-2 WOT DOWNSHIFTS

APPLICABLE MODEL(S)/VINS

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.

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.

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.

PART(S) INFORMATION

Part Number Description Qty. Notes

ZZP3 18 881E Module, Powertrain Control (Federal) 1 --
ZZRJ 18 881A Module, Powertrain Control (California) 1 --

WARRANTY INFORMATION

Note
This information applies to verified customer complaints on vehicles covered under normal warranty. Refer to the SRT microfiche for warranty term information.

Warranty Type A

Symptom Code 07

Damage Code 9W

Part Number Main Cause See PART(S) INFORMATION

Quantity 1

Operation Number / Labor Hours F0812XRX / 0.3