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Canada - Engine Control - ECM Update for Shifting Performance

Bulletin
TSB2882

Issue Date
November 3, 2010

Title
ECM CALIBRATION: ENHANCEMENT TO SHIFTING PERFORMANCE

Component
AUTOMATIC TRANSMISSION

Models
'10 GX460

INTRODUCTION:

Some vehicles may exhibit the following shifting conditions:
- Harsh shift on acceleration below 32kmh (20 mph) during the 2-1 downshift.
- Excessive lock-up operation at freeway speeds about 80 - 96kmh (50 - 60 mph), sometimes referred to as "busy shifting".

The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised. Use the following repair procedure to address these
conditions.






APPLICABILITY:






WARRANTY INFORMATION:






PARTS INFORMATION:






CALIBRATION INFORMATION:






REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:

1. Test drive the vehicle and confirm there is a harsh shift on acceleration below 32kmh (20 mph), and or excessive lock-up operation at freeway speeds about 80 - 96kmh (50 - 60 mph).Test drive the vehicle and confirm there is a harsh shift on acceleration below.






2. Check for the Authorized Modifications Label affixed to the vehicle in the location shown in Figure 1. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration - go to step 3.
3. Flash reprogram the ECM (PCM).

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 GR8 Battery Diagnostic Station Instruction Manual located on ETAS/TIS library > Tools > tools and equipment > GR8 Battery Diagnostic Station Instruction Manual.

Follow the procedures outlined in TSB2401, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.

4. Start the engine and warm it up to normal operating temperature before test driving.
5. Test drive the vehicle to confirm proper vehicle operation and ECM (PCM) initial learning.

Refer to the Repair Manual within E-TAS / TIS library:
- Division: Lexus
- Model: GX460
- Year: 2010
- Service Category: Drivetrain
- Section: Automatic Transmission/Transaxle
- Keyword: A750F Automatic Transmission/Transaxle: Automatic Transmission System: Initialization

6. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
- ECU 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 TSB number]

B. Affix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through your facing PDC, P/N 00451-00001-25.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.
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