Subject: | Information On Gear Ratio Change for Automatic Transaxles (MP6) Used With SOHC (LKO) Engine |
Models: | All 1993 Saturn SL1 Sedans, SW1 Station Wagons and SC1 Coupes equipped with MP6 automatic transaxles built after, and including VIN PZ156140. |
To help reduce the number of parts required at the assembly plant, the first gear ratios will become common between both the MP6 and MP7 automatic transaxles.
Since vehicles with the new gear ratios require a different PCM calibration, always check the VIN breakpoint to make sure that the correct calibrations is downloaded, if you are replacing a PCM
There are three ways of identifying which gear ratio is installed as a transaxle:
NOTE: Every model year the change code will start back at "0".
AUTOMATIC TRANSAXLE | ||
---|---|---|
Gear and Hub Assembly - 1st Drive | MP6 - 2nd Design | MP6 - 1st Design |
Part Number | 21002588 | 210025441 |
Number of Teeth | 19 | 21 |
Gear - 1st Driven | ||
Part Number | 21002633 | 21002634 |
Number of Teeth | 48 | 47 |
Transaxle Assembly | 210022847 Base (MP6) | 21002462 Base (MP6) |
PCM/TC EEPROM ID | 7386 | 8198 or 3294 |
NOTE: If a calibration download is required on a 1993 vehicle, refer to this bulletin to select the proper calibration from the service stall system (SSS), which is determined by the vehicle identification number (VIN).
Important: After the new calibration has been installed, vehicle must be driven until operating temperature is reached. This allows the PCM to relearn variations in the fuel system and transaxle electronic controls that improve driveabilty and engine idle.