Canada - Engine, A/T Controls - Harsh Downshift When Stopping

Bulletin
3139

Issue Date
March 16, 2009

Market
Canada

Title:
HARSH DOWNSHIFT WHEN COMING TO A STOP

Component
AUTOMATIC TRANSMISSION

Models
'09 Corolla/Matrix


INTRODUCTION:
Some customers may experience a harsh downshift feeling when coming to a stop after the transaxle has up-shifted to 4th or 5th gear. The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised. Use the following repair procedure to address customer concerns.







APPLICABILITY:







WARRANTY INFORMATION:







PARTS INFORMATION:

NOTE
- The ECM (SAE term: Powertrain Control Module/PCM) should NOT be replaced as part of the repair procedure.
- Authorized Modification Labels may be ordered in packages of 25 from your facing PDC.







CALIBRATION INFORMATION:







REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:







1. 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 2.
2. 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 TSB No.2758, "Techstream ECU Flash Reprogramming Procedure", and flash the ECM (PCM) with the NEW calibration file update.

3. Reset the engine and ECT memory.
Refer to ETAS, applicable model and model year Repair Manual:
- Division: Toyota
- Model: Corolla/Matrix
- Year: 2009
- Service Category: Drivetrain
- Section: Automatic Transmission
- Keyword: U250E Automatic Transmission / Transaxle: Automatic Transaxle System: Initialization"

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.

NOTE
During the initial test drive there may be some slightly harsh downshifts - these are NORMAL. They are a result of fuel cut control. Continue test driving until initial learning and smooth shifting are achieved.

Refer to ETAS, applicable model and model year Repair Manual:
- Division: Toyota
- Model: Corolla/Matrix
- Year: 2009
- Service Category: Drivetrain
- Section: Automatic Transmission
- Keyword: U250E Automatic Transmission / Transaxle: Automatic Transaxle System: Road Test"

6. Install the Authorized Modifications Label.
A. Using a permanent marker, enter the following information on the label:
- ECM 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 the MDC, 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.