Engine/Transmission Controls - Poor A/T Shift Quality

TRANSMISSION & CLUTCH
TC004-03
REVISED

August 4, 2003

Title:
ECM CALIBRATION: SHIFT FEELING ENHANCEMENT

Models:
'02 - '03 ES 300 & '04 - '05 ES 330

REVISION NOTICE:
^ April 1, 2005: 2004 - 2005 model year ES 330 vehicles have been added to Applicable Vehicles. Introduction and Note have been updated.

^ Calibration Identification Chart has been updated to include ES 330 calibration IDs.

^ August 6, 2003: There has been a change in Warranty Time. Previous versions of this TSIB should be discarded.

Introduction

To improve the transmission shift feeling during specific operating modes, the Engine

Control Module (SAE term: Powertrain Control Module/PCM) calibration has been revised. These improvements include:

^ Reduced downshift lag when accelerating at speeds from 10 to 20 mph.

^ Less gear hunting when driving on/off accelerator pedal at 20 to 30 mph (for example: during heavy rush-hour traffic).

^ Improved response rate during heavy acceleration from a stop.

NOTE:
^ Version 12.01a or later Diagnostic Tester software is required to perform this procedure.

^ Before proceeding, verify the ECM (PCM) calibration has NOT been updated by checking for the Authorized Modifications Label (shown in step 1 of the Repair Procedure).

^ Harsh ATM shifting may result if any Repair Procedure steps are omitted (specifically steps 2 and 4 of "Flash Reprogram ECM").

Applicable Vehicles
^ 2002 - 2003 model year ES 300 vehicles.
^ 2004 - 2005 model year ES 330 vehicles.





Warranty Information





Parts Information

NOTE:
Authorized Modification Labels may be ordered in packages of 25 from the Materials Distribution Center (MDC) through Dealer Daily Dealer Support Materials System or by calling the MDC at 1-800-622-2033.





Required SSTs

NOTE:
Additional Diagnostic Tester Kits, CAN Interface Modules, Program Cards, or other SSTs may be ordered by calling SPX-OTC at 1-800-933-8335.





Calibration Identification Chart

Repair Procedure





1. Check for the Authorized Modifications Label affixed to the vehicle in the location Procedure shown in Figure 1. Confirm if ECM (PCM) calibration has been updated. If not the latest ECM (PCM) calibration go to step 2.





2. Connect the Diagnostic Tester to the vehicle and select CURRENT ECU CAL from the ECU REPROGRAM MAIN MENU. Determine the vehicle's current ECU calibration (see Figure 2).

- The sample screen prints shown are the 12.01 a software version and may differ from subsequent software versions.

NOTE:
^ If Calibration ID matches "Previous Calibration ID" as shown in Calibration Identification Chart proceed with flash reprogramming.

^ If Calibration ID matches "New Calibration ID" as shown in Calibration Identification Chart, this vehicle has already been programmed. Refer to TIS for diagnostic procedures applicable to any stored DTCs.

3. If ECU calibration ID is not the same as the New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).

4. Flash Reprogram ECM (PCM)

Follow the procedures outlined in Lexus TSIB No. SS001-01, "ECU Flash Reprogramming Process," and flash the ECM (PCM) with the new calibration file update.

NOTE:
If the "Check Engine" light is ON when the ignition is turned back on to begin the reprogramming process, a scan tool cable problem exists. Refer to TSIB No. SS001-01, "ECU Flash Reprogramming Process."





5. Reset the ECM (PCM) learned values using the diagnostic tester. Refer to the procedures below.

- The sample screen prints are the 12.01 a software version and may differ from subsequent software versions.

NOTE:
Failure to reset the ECM (PCM) memory will result in continued ATM shifting complaints.

6. Follow the procedures outlined in TSIB No. EG012-04, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).

7. Start the engine and warm it up to normal operating temperature before test-driving.

8. Test drive vehicle to confirm proper vehicle operation.

9. Enter the required information on the Authorized Modifications Label and affix it to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.

10. Calibration update is complete.

NOTE:
^ Select premium unleaded gasoline with an Octane Rating of 91 (Research Octane Number 96) or higher for optimum engine performance.

^ The effect of the new calibration may become more apparent after several days of driving as the ECM (PCM) "learned values" are re-established from the customer's driving.