SL L4-1.9L SOHC VIN 9 (1991)
CORRECTIVE
ACTION:
NOTE: Determine what transaxle is on the vehicle, then refer to the following chart before proceeding to the procedures in this bulletin.
A new powertrain control module (PCM) calibration has been released for service that helps eliminate this rattle condition. This service PCM calibration
modifies the shift schedules, causing shifts and torque converter clutch (TCC) engagements to occur at higher vehicle speeds.
The new service PCM/TC calibrations are:
^
SOHC (LKO) MP6 Trans. EEPROM 4960
^
DOHC (LLO) MP7 Trans. EEPROM 4964
NOTE:
Engine and transaxle calibrations are certified and released in pairs. To select the proper engine calibration to use with these transaxle
calibrations, refer to the "Selections" in "Service Stall System."
Only vehicles built with the latest PCM can be reprogrammed with the new calibration. Vehicles with earlier versions of the PCM require replacement of
the PCM before reprogramming.
To determine if the PCM can be reprogrammed with this service calibration, check the TCM ID TABLE with the portable diagnostic tool (PDT) or the
service stall system (SSS). If the TC EPROM SW ID is 4666 the PCM will have to be replaced. The new version of the PCM will have a TC EPROM
SW ID of 1465.
If the PCM has to be replaced, refer to the "Powertrain Control Module" removal and installation procedures in the "Powertrain Control Module" section
of the "Electronic Engine Controls Service Manual."
If the TC EPROM SW ID is 1465, refer to "Reprogramming EEPROM" in the "System Utilities" section of the "Service Stall System (SSS) User Guide"
for procedures on reprogramming with the service calibration.
PARTS
REQUIREMENTS: 21021221
Powertrain Control Module Assembly-Engine Gas, 4 Cyl,
1.9L, TBI, SOHC
(LKO) - Auto. Trans.
MP6
21021220
Powertrain Control Module Assembly-Engine Gas, 4 Cyl,
1.9L, MFI, DOHC
(LLO) - Auto. Trans.
MP7
CLAIM
INFORMATION: To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:
