Canada - Engine, A/T Controls - ECM Update For Improved Shifts

Bulletin
TSB2258

Issue Date
2005-06-30

Market
Canada

Title
ECM CALIBRATION: SHIFT FEELING ENHANCEMENT

Component
AUTOMATIC TRANSMISSION & TRANSAXLE

Models
'04 - '05 Camry (1MZ-FE, 5-Speed A/T)

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 kmh.
- Less gear hunting when driving on/off accelerator pedal at 32 to 48 kmh (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 2 and 4 of "Flash Reprogram ECM").

APPLICABLE VEHICLES:
- 2004 - 2005 model year Camry vehicles equipped with 1MZ-FE engine and 5-speed automatic transmission.






WARRANTY INFORMATION:






PARTS INFORMATION:






REQUIRED SSTs:






ECM CALIBRATION NUMBER INFORMATION:

NOTE:
2004 model year Camry 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 Camry Repair Manual information on ETAS when checking Powertrain Diagnostic Trouble Codes (DTCs) on 2004 model year Camry 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 are the 12.2a 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.

FLASH REPROGRAM PROCEDURE:

Flash Reprogram ECM






1. Remove the 10A ECU-IG fuse from the Instrument Panel Junction Block assembly. This action prevents possible activation of the ABS relay, resulting in ECM Reprogramming failure.

NOTE:
ECU damage may occur if 10A fuse is NOT removed.

2. Follow the procedures outlined in TSB No. 0941, "ECU Flash Reprogramming Process" and flash the ECM with new calibration file updates.
3. Reinstall the 10A ECU-IG fuse in the Instrument Panel Junction Block assembly.






4. Reset the ECM learned values using the diagnostic tester. Refer to the procedures.
- The sample screen prints seen are the 12.2a software version, and may differ from subsequent software versions.

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

5. 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).
6. Start the engine and warm it up to normal operating temperature before test-driving.
7. Test-drive vehicle to confirm proper vehicle operation.
8. 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
9. 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.