ECM Reset Memory Function (TC002-03)

Publication date: 2004-12-20
Reference number: TC002-03

ECM RESET MEMORY FUNCTION

TECHNICAL SERVICE BULLETIN

Reference Number(s): TC002-03 Revised, Date of Issue: December 20, 2004

LEXUS:	1998 - 2005 Applicable Models
SECTION:	TRANSMISSION & CLUTCH
COPYRIGHT:	© 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002

Superceded Bulletin(s): TC002-03, Date of Issue: May 5, 2003

NOTE: December 20, 2004: Applicable Vehicles section has been updated and modified, 2004 and 2005 model years added; and Reset Procedure 2 has been revised. Previous versions of this TSIB should be discarded.

INTRODUCTION

Whenever an automatic transmission is replaced, overhauled or individual components are replaced, use this procedure to erase Engine Control Module (ECM, SAE term: Powertrain Control Module, PCM) "Learned Values" and minimize subsequent performance concerns.

CAUTION: Failure to follow the following procedure may lengthen the time to readjust the "Learned Values," potentially resulting in performance concerns.

APPLICABLE VEHICLES

Refer to for the following vehicles with Electronically Controlled Automatic Transmissions:

1999 - 2003 model year ES 300 and RX 300 vehicles.
2003 - 2005 model year GX 470 vehicles.
2004 - 2005 model year RX 330 vehicles.

Refer to for the following vehicles with Electronically Controlled Automatic Transmissions:

1998 - 2005 model year GS 430/400/300, LS 430/400, LX 470, and SC 430/400/300 vehicles.
2001 - 2005 model year IS 300 vehicles.

WARRANTY INFORMATION

OP Code	Description	Time	OFP	T1	T2
N/A	Not Applicable to Warranty	-	-	-	-

REQUIRED SSTS

Fig 1: Required Special Service Tools

NOTE: Additional Diagnostic Tester Kits, CAN Interface Modules, Program Cards or other SSTs may be ordered by calling SPX/OTC.

RESET PROCEDURE 1

Connect the Lexus Diagnostic Tester to the vehicle.
Reset the ECM (PCM). Refer to the procedures below.

Fig 2: ECM Reset Procedure
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Start the engine and warm it up to normal operating temperatures before test-driving.
Perform a thorough test drive with several accelerations from a stop with "light throttle" application until proper transmission shifting is verified.

RESET PROCEDURE 2

Disconnect the negative battery cable for 5 minutes.
Reconnect battery cable.
Start the engine and warm it up to normal operating temperatures before test-driving.
Perform a thorough test drive with several accelerations from a stop with "light throttle" application until proper transmission shifting is verified.