Engine/Transmission Controls - Resetting ECM Memory

TRANSMISSION & CLUTCH
TC002-03
REVISED

Title:
ECM RESET MEMORY FUNCTION

Models:
'00 - '05 All Models

June 10, 2003

TSB REVISION NOTICE:

^ December 20, 2004: Applicable Vehicles section has been updated - 2004 and 2005 model years added, models and model years updated for various models; and Reset Procedure 2 has been revised.

^ January 16, 2004: Tundra vehicles were added to the Applicable Vehicles chart.

^ December 17, 2003: T-100 vehicles were removed from the Applicable Vehicles chart.

Previous versions of this TSB should be discarded.

Introduction

Whenever an automatic transmission is replaced, overhauled or individual components are replaced, use this procedure to clear Engine Control Module (ECM, SAE term: Powertrain Control Module, PCM) "Learned Values" to minimize subsequent performance concerns.

CAUTION:
Failure to follow the procedure below may lengthen the time to readjust the ECM "Learned Values," potentially resulting in performance concerns.





Required SSTs





Warranty Information

Applicable Vehicles





Refer to Reset Procedure 1 for the vehicles with Electronically Controlled Automatic Transmissions:





Refer to Reset Procedure 2 for the vehicles with Electronically Controlled Automatic Transmissions:

Reset Procedure 1

1. Connect the Toyota Diagnostic Tester to the vehicle.





2. Reset the ECM (PCM). Refer to the procedures below.

3. Start the engine and warm it up to normal operating temperatures before test-driving.

4. Perform a thorough test drive with several accelerations from a stop with "light throttle" application until proper transmission shifting is verified.

Reset Procedure 2

1. Disconnect the negative battery cable for 5 minutes.

2. Reconnect battery cable.

3. Start the engine and warm it up to normal operating temperatures before test-driving.

4. Perform a thorough test drive with several accelerations from a stop with "light throttle" application until proper transmission shifting is verified.