Automatic Transaxle Control Module Adaptive Learning (03-40-003)

Publication date: 2003-02-01
Reference number: 03-40-003
Supersedes refnos: 01-40-002

AUTOMATIC TRANSAXLE CONTROL MODULE ADAPTIVE LEARNING

TECHNICAL SERVICE BULLETIN

Reference Number(s): 03-40-003, Date of Issue: February, 2003

HYUNDAI:	All Models
GROUP:	40 - Transaxle

Superceded Bulletin(s): 01-40-002

NOTE: This TSB supersedes TSB# 01-40-002 to include additional information.

DESCRIPTION

The transaxle control module (TCM) internal logic allows the TCM to compensate for mechanical tolerance changes which may occur during the life of the transaxle due to normal wear. If battery power is disconnected from the TCM, the adaptive learning is cancelled.

Whenever battery power is disconnected from the TCM or a new transaxle is installed, follow the procedure below to restore adaptive learning:

NOTE: Transaxle shift quality should not be evaluated until adaptive learning has been completed.

TCM logic was revised to allow adaptive learning to occur at a lower temperature on the dates shown below.

NOTE: Adaptive learning does not begin until the ATF is above the temperature shown in ADAPTIVE LEARNING REQUIRED BEGINNING TEMPERATURE :

ADAPTIVE LEARNING REQUIRED BEGINNING TEMPERATURE

MODEL	PREVIOUS - 122°F (50°C)	NEW - 68°F (20°C)
Accent	All	- - -
Elantra	-11/21/01	11/21/01-
Tiburon	1997-2001 MY	2003 MY
Sonata	-11/30/01	11/30/01-
Santa Fe 2.4L	2001-02 MY	2003 MY
Santa Fe 2.7L	-1/17/02	1/17/02-
Santa Fe 3.5L	- - -	All
XG300	All	- - -
XG350	- - -	All

ADAPTIVE LEARNING PROCEDURE

Attach a Hi-Scan Pro and select "Automatic Transaxle" menu, "Current Data" menu and "Trans Temp. Sensor".
Drive the vehicle until the ATF temperature is above the temperature shown in ADAPTIVE LEARNING REQUIRED BEGINNING TEMPERATURE
Accelerate the vehicle through several 1-2-3-4 upshifts at small throttle openings (approximately 25-30% TPS) until shift flare and shift shock no longer occur.

NOTE: Adaptive learning for the 2-3 shift takes longer than for the 1-2, or 3-4 shifts.