SL L4-1.9L SOHC VIN 9 (1991)
Engine Control Module: All Technical Service Bulletins
ECM - Harsh 1-2 Shift During Light Throttle Acceleration
NO.:
92-T-27
DATE:
June, 1992
GROUP:
Transaxle
CORP. NO.:
287106
SUBJECT:
Harsh 1-2 Upshift During Light Throttle Acceleration (Replace PCM and Download New Calibration)
MODELS
AFFECTED:
1991 SL2 Sedans and SC Coupes equipped with MP7 automatic transaxle
CONDITION:
A harsh 1-2 upshift may be experienced during light throttle accelerations. This condition is most noticeable when the transaxle is at, or above normal
operating temperature.
CAUSE:
Under certain driving conditions, the PCM/TC adaptive process may improperly adjust clutch fill times, resulting in a harsh 1-2 upshift, when
accelerating from a stop, with a throttle opening between 12 and 20 percent.
CORRECTIVE
ACTION:
