Canada - Engine Controls - ECM Update For Improved Shifting

Bulletin
1307

Issue Date
November 12, 2003

market
Canada

Title:
ECM CALIBRATION: SHIFTING ENHANCEMENT

Component
AUTOMATIC TRANSMISSION & TRANSAXLE

Model
'04 - '05 Sienna

REVISION NOTICE:
- July 15, 2005: The following changes have been implemented since first publication: 2005 model year Sienna vehicles added to Applicable Vehicles. Introduction and Note updated. New part, Brake Actuator Assembly, added. Calibration Identification Chart updated to include 2005 model year Sienna calibration IDs. Repair Procedure expanded with instructions for vehicles with laser cruise control.
Previous versions of this TSB should be discarded.

INTRODUCTION:
To improve the transmission shift feeling during specific operating modes, the Engine Control Module (ECM) (SAE term: Powertrain Control Module/PCM) calibration has been revised. These improvements include:

- Reduced downshift lag when accelerating at speeds from 16 to 32 km/h.
- Less gear hunting when driving on/off accelerator pedal at 32 to 48 km/h (for example: during heavy rush--hour traffic).
- Improved response rate during heavy acceleration from a stop.

NOTE:
- Version 12.1a 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).
- Harsh ATM shifting may result if any Repair Procedure steps are omitted (specifically steps 5 and 11).

APPLICABLE VEHICLES:
- 2004 - 2005 model year Sienna vehicles.







WARRANTY INFORMATION:







PARTS INFORMATION:







REQUIRED SSTS:







ECM CALIBRATION NUMBER INFORMATION:

NOTE:
- Calibration files on the Diagnostic Tester use the following abbreviations:
-- 2WD = Front Wheel Drive
-- AWD = All Wheel Drive
- 2004 model year Sienna vehicles, which have been flash reprogrammed using the procedures in this TSB will contain upgraded 2005 model year OBD II logic and will require VIN input. Refer to the 2005 model year Sienna Repair Manual information on ETAS when checking Powertrain Diagnostic Trouble Codes (DTCs) on 2004 model year Sienna vehicles that have been reprogrammed.

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 seen below are the 12.1a 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 as shown in Calibration Identification Chart, this vehicle has already been reprogrammed. Refer to ETAS for diagnostic procedures applicable to any stored DTCs.

3. If ECU calibration ID is not the same as the "New Calibration ID" listed previously, proceed to Flash Reprogram ECM.

4. Flash Reprogram ECM
Follow the procedures outlined in TSB No. 0941, "ECU Flash Reprogramming Process" and flash the ECM with new calibration file updates.

NOTE:
If the "Check Engine" light is ON when the ignition is turned back on to begin the reprogramming process, a scan tool cable problem exists. Refer to TSB No. 0959, "ECU Flash Reprogramming Error Message."

5. Reset the ECM learned values using the diagnostic tester. Refer to the procedures.
The sample screen prints seen below are the 12.1a software version, and may differ from subsequent software versions.







NOTE:
Failure to reset the ECM memory will result in continued ATM shifting complaints.

6. Follow the procedures outlined in TSB No. 2133, "Entering VIN During ECM (PCM) Replacement and/or DTC P0630," and write the VIN to the ECM (PCM).
7. For vehicles NOT equipped with laser cruise control, proceed to step 10.
8. For 2004 model year vehicles equipped with laser cruise control, a new Brake Actuator Assembly (with VSC ECU) must be installed at the time of recalibration. If vehicle is equipped with laser cruise, use the Parts Information table to order the correct part (2WD or AWD) and follow the instructions listed on ETAS: 2004 model year Sienna Repair Manual: Brake: ABS & Traction Actuator Assy: Replacement to replace the Brake Actuator Assembly (with VSC ECU).
9. Follow the procedures outlined in TSB No. 1332, "Zero Point Calibration", to calibrate the sensors affected by the Brake Actuator Assembly replacement.
10. Start the engine and warm it up to normal operating temperature before test--driving.
11. Test--drive vehicle to confirm proper vehicle operation (and proper laser cruise control operation if so equipped).
12. 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 PDC, P/N 00451-00001-25
13. 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.
- Effect of the new calibration may become more apparent after several days of driving as the ECM's learned values' are established from the customer's driving habits.

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.