Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS1999RX 300 AWD V6-3.0L (1MZ-FE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULETECHNICAL SERVICE BULLETINSENGINE CONTROLS - ECM MEMORY RESET AFTER A/T SERVICE
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)
Engine Controls - ECM Memory Reset After A/T Service
1999 Lexus RX 300 AWD V6-3.0L (1MZ-FE)SECTION Engine Controls - ECM Memory Reset After A/T Service
TRANSMISSION & CLUTCH
TC002-03
REVISED
Title:
ECM RESET MEMORY FUNCTION
Models:
'98 - '05 Applicable Models
May 5, 2003
TSIB REVISION NOTICE:
December 20, 2004: Applicable Vehicles section has been updated and modified, 2004 and 2005 model years added; and Reset Procedure 2 has been revised.
Previous versions of this TSIB should be discarded.
Introduction
Whenever an automatic transmission is replaced, overhauled or individual components are replaced, use this procedure to erase Engine Control Module (ECM, SAE term: Powertrain Control Module, PCM) "Learned Values" and minimize subsequent performance concerns.
CAUTION:
Failure to follow the following procedure may lengthen the time to readjust the "Learned Values," potentially resulting in performance concerns.
Applicable Vehicles
Refer to Reset Procedure 1 for the following vehicles with Electronically Controlled Automatic Transmissions:
^ 1999 - 2003 model year ES 300 and RX 300 vehicles.
^ 2003 - 2005 model year GX 470 vehicles.
^ 2004 - 2005 model year RX 330 vehicles.
Refer to Reset Procedure 2 for the following vehicles with Electronically Controlled Automatic Transmissions:
^ 1998 - 2005 model year GS 430/400/300, LS 430/400, LX 470, and SC 430/400/300 vehicles.
^ 2001 - 2005 model year IS 300 vehicles.
Warranty Information
Required SSTs
Reset Procedure 1
1. Connect the Lexus Diagnostic Tester to the vehicle.
2. Reset the ECM (PCM). Refer to the procedures.
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.
TC002-03
REVISED
Title:
ECM RESET MEMORY FUNCTION
Models:
'98 - '05 Applicable Models
May 5, 2003
TSIB REVISION NOTICE:
December 20, 2004: Applicable Vehicles section has been updated and modified, 2004 and 2005 model years added; and Reset Procedure 2 has been revised.
Previous versions of this TSIB should be discarded.
Introduction
Whenever an automatic transmission is replaced, overhauled or individual components are replaced, use this procedure to erase Engine Control Module (ECM, SAE term: Powertrain Control Module, PCM) "Learned Values" and minimize subsequent performance concerns.
CAUTION:
Failure to follow the following procedure may lengthen the time to readjust the "Learned Values," potentially resulting in performance concerns.
Applicable Vehicles
Refer to Reset Procedure 1 for the following vehicles with Electronically Controlled Automatic Transmissions:
^ 1999 - 2003 model year ES 300 and RX 300 vehicles.
^ 2003 - 2005 model year GX 470 vehicles.
^ 2004 - 2005 model year RX 330 vehicles.
Refer to Reset Procedure 2 for the following vehicles with Electronically Controlled Automatic Transmissions:
^ 1998 - 2005 model year GS 430/400/300, LS 430/400, LX 470, and SC 430/400/300 vehicles.
^ 2001 - 2005 model year IS 300 vehicles.
Warranty Information
Required SSTs
Reset Procedure 1
1. Connect the Lexus Diagnostic Tester to the vehicle.
2. Reset the ECM (PCM). Refer to the procedures.
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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.