Canada - Engine, A/T Controls - ECM Update For 2-1 Downshift

Bulletin
TSB3310

Issue Date
November 12, 2009

Market
Canada

Title
ECM CALIBRATION: ENHANCEMENT TO SHIFTING PERFORMANCE AND SMOOTHNESS

Component
ENGINE ELECTRICAL

Models
'09 Tacoma

INTRODUCTION:
To enhance shifting performance and smoothness below 32 kmph (20 mph) during the 2-1 downshift on vehicles equipped with an A750 transmission, the Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM) calibration has been revised.
Use the following repair procedure to address this condition.






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. Test drive the vehicle and confirm there is a hesitation and/or harsh shift on acceleration below 32 kmph (20 mph).

NOTE:
If there is NO hesitation or harsh shift felt below 32 kmph (20 mph), this TSB does NOT apply. Continue diagnosis per the Repair Manual to isolate the cause of the condition.







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 TSB No. 2758, "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: Toyota
- Model: Tacoma
- Year: 2009
- Service Category: Drivetrain
- Section: Automatic Transmission/Transaxle
- Keyword: A750E/ A750F Automatic Transmission: Automatic Transmission System: Road Test

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

7. Test drive the vehicle to confirm proper vehicle operation.

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.