A/T - Poor Shift Quality
TRANSMISSION & CLUTCHTC004-03
REVISED
August 4, 2003
Title:
ECM CALIBRATION: SHIFTING ENHANCEMENT
Models:
'02 - '03 ES 300
REVISION NOTICE:
August 6, 2003: There has been a change in Warranty Time.
The previous TSIB should be discarded.
Introduction
To enhance ATM shifting, the Engine Control Module (SAE term: Powertrain Control Module/PCM) calibration has been updated.
NOTE:
^ Version 10.1a 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).
^ 2002 model year ES 300 vehicles, which have been flash reprogrammed using the procedures in this TSIB, will contain upgraded 2003 model year OBD Illogic. Refer to the 2003 model year ES 300 Repair Manual information on the Technical Information System (TIS) when checking Powertrain Diagnostic Trouble Codes (DTCs) on 2002 model year vehicles that have been reprogrammed.
Applicable Vehicles
^ 2002 - 2003 model year ES 300 vehicles.
Warranty Information
Applicable Warranty *:
This repair is covered under the Lexus Federal Emissions Warranty. This warranty is in effect for 96 months or 80,000 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 SSTs
NOTE:
Additional Diagnostic Tester Kits, Program Cards or 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 shown in Figure 1. Confirm if ECM (PCM) calibration has been updated. If not 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 10.1a 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, this vehicle has already been programmed. Refer to Repair Manual for diagnosis.
3. If ECU calibration ID is not the same as the "New Calibration ID" listed previously, proceed to Flash Reprogram ECM (PCM).
Flash Reprogram ECM
1. Follow the procedures outlined in Lexus TSIB SS001-01 "ECU Flash Reprogramming Process" dated March 9, 2001 and flash the ECM (PCM) with new calibration file update.
2. Reset the ECM (PCM) learned values using the diagnostic tester. Refer to the procedures below.
- The sample screen prints shown are the 10.1a software version, and may differ from subsequent software versions.
NOTE:
Failure to reset the ECM memory will result in continued ATM shifting complaints.
3. Start the engine and warm it up to normal operating temperature before test-driving.
4. Test drive vehicle to confirm proper vehicle operation.
5. 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.
6. 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.