A/T, Engine Controls - ECM/TCM Reset/Relearn Procedure

AUTOMATIC TRANSAXLE CONTROL MODULE - RESET AND RELEARN ADAPTIVE VALUES

MODEL: All

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 article provides the procedures necessary to reset (erase) and "relearn" the adaptive values in the PCM/TCM. After the following repairs have been completed, the PCM/TCM adaptive values must be reset in order to provide optimum shift quality:

^ Replace automatic transaxle

^ Reprogram or swap PCM/TCM from another vehicle

Adaptive values must be reset using procedure # 1 or # 2 according to model and model year (MY) as shown below.

VEHICLES AFFECTED:

^ All





I. RESET PCM/TCM ADAPTIVE VALUES

HI-SCAN PROCEDURE:

1. Turn the Ignition key to the "ON" position (do not start engine) and move the shift lever to "P."

2. Attach the Hi-Scan Pro to the data link connector (DLC):

^ Select vehicle

^ Select "AUTOMATIC TRANSAXLE" menu.

^ Select "RESETTING ADAPTIVE VALUES,
press "ENTER"

^ Press "ENTFR", then "REST" (F1)

^ Turn Ignition key "OFF" for 10 seconds.

II. RELEARN ADAPTIVE VALUES:

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

3. Attach a Hi-Scan Pro or GDS and select "Engine" menu, "Current Data" menu and throttle position sensor in volts ("THROTTLE POS. SENSOR", "ACCEL. P0S. S", or "ACCEL PEDAL 1 VOLT", depending on model).

4. Drive the vehicle until the ATF temperature is within the temperature range shown.





5. Request an assistant to monitor the Hi-Scan while accelerating the vehicle at small throttle openings (approximately 25-30% throttle). Hold the accelerator pedal steady at a throttle position sensor value of 1.45~1.75v during several 1-2-3-4 upshifts.





Repeat until normal gear transitions occur.

6. Repeat this procedure for 4-3, 3-2 and 2-1 downshifts.





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

WARRANTY INFORMATION:

Applicable warranty coverage applies.