A/T - Hesitation Or Bump Upon Acceleration

TRANSMISSION & CLUTCH
TC009-07

Title:
HESITATION OR BUMP FEELING UPON
ACCELERATION FROM A STOP

Models:
'07 LS 460/460L

July 9, 2007

Introduction

Some 2007 model year LS 460 and 460L customers may complain about a condition where a hesitation or gear engagement bump feeling occurs when accelerating after being stopped in the Drive position for a few seconds. The Transmission Control Module (TCM) logic has been revised to improve this condition.

Applicable Vehicles

^ 2007 model year LS 460/460L vehicles produced BEFORE the Production Change Effective VIN shown below.





Production Change Information





Parts 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.





Required Tools & Material





Calibration Identification Chart

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 charger 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 charger please refer to the GR8 instructions Manual, located on 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. 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): TC009-07

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.

4. The repair is complete. Test drive the vehicle to confirm normal operation.

5. Clear any DTCs that set during the reprogramming process.