A/T Controls - TCM Update Fro Shift Improvements
L-SB-0027-09March 17, 2009
TCM Calibration: Enhancement to Shifting Performance & Smoothness
Service Category
Drivetrain
Section
Automatic Transmission/Transaxle
Market
USA
Applicability
Introduction
To enhance shifting performance and smoothness during acceleration the Transmission Control Module (TCM) calibration has been revised. Use the following repair procedure to address customer concerns.
Calibration Information
Warranty Information
APPLICABLE WARRANTY
^ This repair is covered under the Lexus Powertrain Warranty. This warranty is in effect for 72 months or 70,000 miles, whichever occurs first, from the vehicle's in-service date.
^ Warranty application is limited to correction of a problem based upon a customer's specific complaint.
Parts Information
NOTE
^ The TCM should NOT be replaced as part of the repair procedure.
^ Authorized Modification Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through Dealer Daily - Dealer Support Materials Orders.
Required Tools & Equipment
NOTE
^ Additional SSTs may be ordered by calling 1-800-933-8335.
^ The GR8 Battery Diagnostic Station (P/N 00002-MCGR8) supersedes the Automatic Trickle Charger (P/N 00002-YA122-01) and Fast Battery Chargers (Associated P/N ASE6003 and Christie P/N CAPPDQ). P/N 00002-YA122-01, ASE6003, and CAPPDQ are now obsolete.
Repair Procedure
1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the TCM calibration has been updated. If the calibration ID listed is NOT the latest TCM calibration - go to step 2.
2. Flash reprogram the TCM.
NOTE
^ The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
^ For details on how to use the GR8 Battery Diagnostic Station, refer to the located on the Technical Information System (TIS), Diagnostics - Battery
Follow the procedures outlined in TSIB No. SS002-07, "Techstream ECU Flash Reprogramming Procedure", and flash the TCM with the NEW calibration file update.
3. Start the engine and warm it up to normal operating temperature before test driving.
4. Test drive the vehicle to confirm proper vehicle operation and TCM initial learning.
Refer to TIS 2007 model year ES 350 Repair Manual: Drivetrain - Automatic Transmission/Transaxle - "U660E Automatic Transaxle : Automatic Transaxle System: Road Test"
5. If any of the following conditions still exist check the automatic transaxle fluid level and adjust if necessary.
^ Shift Flare
^ Harsh Downshift on Reacceleration
^ "Jerk" Feeling on Reacceleration Are any of the conditions above still present?
^ YES - Remove and replace the automatic transaxle assembly w/torque converter.
NOTE
When the automatic transaxle is replaced, the transaxle compensation code (imprinted on the QR label) MUST be input into the TCM. After the automatic transaxle is reinstalled, the QR code label will be positioned where the code cannot be read. Record the transaxle compensation code BEFORE reinstalling the automatic transaxle.
Refer to TIS, 2007 model year ES 350 Repair Manual:
Drivetrain - Automatic Transmission/Transaxle - "U660E Automatic Transaxle: Automatic Transaxle Assembly: Registration
^ NO - Go to step 7.
6. After replacement of the transaxle assembly w/torque converter, enter the NEW transaxle compensation code.
Refer to TIS, 2007 model year ES 350 Repair Manual: Drivetrain - Automatic Transmission/Transaxle - "U660E Automatic Transaxle: Automatic Transaxle System: Registration"
7. Install the Authorized Modifications Label.
A. Using a permanent marker enter the following information on the label:
^ TCM part number [Refer to the Parts Information section for the CURRENT PART NUMBER]
^ Calibration ID(s) [Refer to the Calibration Identification Chart for the NEW CALIBRATION ID]
^ Dealer Code
^ Repair Date
^ Change Authority [This TSIB number]
B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC P/N 00451-00001-LBL.
8. Test drive the vehicle to confirm proper vehicle operation and TCM initial learning.