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ECM Calibration Update: Harsh 2-3 Shift During Acceleration (EG005-02)

Publication date: 2002-10-18
Reference number: EG005-02

ECM CALIBRATION UPDATE: HARSH 2-3 SHIFT DURING ACCELERATION

ECM CALIBRATION UPDATE: HARSH 2-3 SHIFT DURING ACCELERATION

TECHNICAL SERVICE BULLETIN

Reference Number(s): EG005-02, Date of Issue:  October 18, 2002
LEXUS: 2001 GS 300 & IS 300
SECTION: Engine
COPYRIGHT: © 2018 Lexus, a division of Toyota Motor Sales, USA License Agreement TMS1002

Introduction

Under certain driving conditions, some 2001 model year GS 300 and IS 300 vehicles equipped with an automatic transmission may exhibit a harsh 2-3 shift during acceleration with light throttle input. A revised ECM calibration file has been developed for the ECM (SAE term: Powertrain Control Module/PCM) to improve this condition.

CAUTION: Version 9.3a or later Diagnostic Tester software is required. Using earlier versions may result in permanent ECM damage.

Applicable Vehicles

2001  model year GS 300 & IS 300  vehicles equipped with automatic transmission.

Required Tools & Material

Fig 1: Tools And Material
G02519273Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: Additional Diagnostic Tester Kits, Program Cards or SST's may be ordered by calling OTC.

ECM Calibration Number Information

ECM CALIBRATION NUMBER

MODEL PREVIOUS CALIBRATION ID NEW CALIBRATION ID
GS 300 53005000 53005200
GS 300 53005100 53005200
IS 300 35301000 35301300
IS 300 35301100 35301300
IS 300 35301200 35301300

Warranty Information

WARRANTY INFORMATION

OP CODE DESCRIPTION TIME OFP T1 T2
EG2003 Recalibrate ECM Engine & Transmission GS 300 0.8 89666-30130 87 99
EG2003 Recalibrate ECM Engine & Transmission GS 300 0.8 89666-30131 87 99
EG2003 Recalibrate ECM Engine & Transmission GS 300 0.8 89666-30132 87 99
EG2004 Recalibrate ECM Engine & Transmission IS 300 0.8 89661-53130 87 99
EG2004 Recalibrate ECM Engine & Transmission IS 300 0.8 89661-53131 87 99
EG2004 Recalibrate ECM Engine & Transmission IS 300 0.8 89661-53132 87 99
NOTE: 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.

Parts Information

PARTS INFORMATION

PREVIOUS PART NUMBER NEW PART NUMBER PART NAME
N/A 00451-00001-LBL Authorized Modification Label
NOTE: Authorized Modifications Labels may be ordered in packages of 25 from the Material Distribution Center (MDC) through Dealer Daily Dealer Support Material System, or by calling the MDC.

GS 300 Repair Procedure

Verify Vehicle Condition (GS 300)

  1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Fig 2. Confirm if ECM (PCM) calibration has been updated. If not latest ECM (PCM) calibration - go to step 2. 
    Fig 2: Authorized Modification Label - GS300
    G02519274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 Fig 3
    Fig 3: Determining Current ECU Calibration
    G02519275Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    NOTE:
    • If Calibration ID matches "Previous Calibration ID" as shown in ECM CALIBRATION NUMBER , proceed with flash reprogramming.
    • If Calibration ID matches "New Calibration ID" as shown in ECM CALIBRATION NUMBER , this vehicle has already been reprogrammed. Refer to Repair Manual for diagnosis.
  3. If ECU calibration ID is not "New Calibration ID" proceed to Flash Reprogram ECM (GS 300).

Flash Reprogram ECM (GS 300)

  1. Remove the ENG MAIN (electric fan)  relay (see Fig 4).
    Fig 4: Removing ENG Main (Electric Fan) Relay
    G02519276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Remove the 3 relays for the ABS/VSC system (see Fig 5).
    Fig 5: Removing ABS/VSC Relays
    G02519277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Follow the procedures outlined in TSIB SS001-01 , "ECU Flash Reprogramming Process" dated March 9, 2001, and flash the ECM with new calibration file update.
    CAUTION: Version 9.3a or later diagnostic tester software is required. Using earlier versions may result in permanent ECU damage.
  4. Enter the required information on the Authorized Modifications Label and affix it to the vehicle at the location shown in Fig 2. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.
  5. Reinstall the ENG MAIN (electric fan)  relay (see Fig 4).
  6. Reinstall the 3 relays for ABS/VSC system (see Fig 5).
  7. Use the Diagnostic Tester to delete any ABS/VSC DTCs that may have been set during this repair procedure.
  8. Calibration update is complete.

IS 300 Repair Procedure

Verify Vehicle Condition (IS 300)

  1. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Fig 6. Confirm if ECM calibration has been updated. If not latest ECM calibration - go to step 2. 
    Fig 6: Authorized Modification Label - IS 300
    G02519278Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 Fig 3)
    NOTE:
    • If Calibration ID matched "Previous Calibration ID" as shown in ECM CALIBRATION NUMBER , proceed with flash reprogramming.
    • If Calibration ID matched "New Calibration ID" as shown in ECM CALIBRATION NUMBER , this vehicle has already been reprogrammed. Refer to Repair Manual for diagnosis.
  3. If ECU calibration ID is not "New Calibration ID" proceed to Flash Reprogram ECM (IS 300).

Flash Reprogram ECM (IS 300)

  1. Disconnect the 2 connectors for the electric fans (see Fig 7).
    Fig 7: Location of Electric Fans Connectors
    G02519279Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Follow the procedures outlined in TSIB SS001-01 , "ECU Flash Reprogramming Process" dated March 9, 2001, and flash the ECM with new calibration file update.
    CAUTION: Version 9.3a or later diagnostic tester software is required. Using earlier versions may result in permanent ECU damage.
  3. Enter the required information on the Authorized Modifications Label and affix it to the vehicle at the location shown in Fig 6. The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.
  4. Reconnect the 2 electric fan connectors disconnected in step 1 (Fig 7).
  5. Calibration update is complete.
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