A/T Controls - PCM/TCM Relearn/Adaptive Values

Group AUTOMATIC TRANSAXLE

Number 09-AT-002

Date FEBRUARY, 2009

Model
ALL

Subject:
AUTOMATIC TRANSAXLE CONTROL MODULE - RESET AND RELEARN ADAPTIVE VALUES

This bulletin supersedes TSB 08-AT-007 to include Genesis V8 and Coupe.

CAUTION:
Before replacing a transaxle to improve a shift quality condition, follow this procedure to reset and relearn the adaptive learning.

DESCRIPTION:

The PCM or TCM contains logic to adjust solenoid duty and line pressure as needed to compensate for normal clutch wear over the life of the transaxle. This bulletin provides the procedures necessary to reset (erase) and "relearn" the PCM/TCM adaptive values.

After the following repairs have been completed, the PCM/TCM adaptive values must be reset in order to provide optimum shift quality:

^ Automatic transaxle replacement

^ Reprogram or exchange a PCM/TCM from another vehicle

I. RESET PCM/TCM ADAPTIVE VALUES WITH GDS:





1. Attach a GDS and select VIN and A/T.





2. From the main screen, select "System Option"





3. Select "Resetting Auto T/A values" and follow the screen prompts.





NOTE:
GDS must be used to reset the adaptive learning for the vehicles shown above.

II. RELEARN ADAPTIVE VALUES:

NOTE:
After the adaptive values have been reset (erased), an "adaptive learning" procedure must be completed as shown below.

4. Attach a GDS and select VIN and A/T.





5. Select Current Data and "Throttle Position" (TPS).

6. Drive the vehicle until the ATF temperature is within the range shown previously above.

7. Request an assistant to monitor the GDS. Accelerate from a stop at the specified TPS specification while the transmission shifts through all (1-2-3-4-5-6) gears and decelerate slowly to a stop. Stop for 5 seconds. Repeat 5 times or until normal gear transitions occur.

NOTE:
Hold the accelerator pedal steady during the upshifts.

CAUTION:
Do not exceed legal speed limits

If additional adaptation is needed, perform the following additional procedures:

8. Perform several sequential downshifts (5-4, 4-3, 3-2 and 2-1) at small to moderate throttle openings.

9. Perform several skip shifts (6-4, 5-3, 5-2, 3-1, etc.) at moderate to large throttle openings.

10. With the vehicle stopped, move the shift lever from P to N to D and back, stopping 3~5 seconds in each gear. Repeat 5 times.





NOTE:
Adaptive learning does not occur below the ATF temperature ranges shown above.

WARRANTY INFORMATION:

Normal warranty applies.