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.

2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Automatic Transmission System: Initialization

RESET MEMORY
NOTE:
- Perform the RESET MEMORY (AT initialization) when replacing the automatic transmission assembly, engine assembly or ECM.
- The RESET MEMORY can be performed only with the Intelligent tester.
HINT:

The ECM memorizes the condition that the ECT controls the automatic transmission assembly and engine assembly according to those characteristics. Therefore, when the automatic transmission assembly, engine assembly, or ECM has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information.

Reset procedure is as follows.
1. Turn the engine switch off.
2. Connect the intelligent tester to the DLC3.
3. Turn the engine switch on (IG) position.
4. Turn the intelligent tester main switch on.
5. Select the item "DIAGNOSIS / ENHANCED OBD II".
6. Perform the reset memory procedure from the ENGINE menu.
  CAUTION: After performing the RESET MEMORY, be sure to perform the ROAD TEST described earlier.
  
  HINT:
  
  The ECM is learned by performing the ROAD TEST.
  1. Tester menu flow:
    
    Fig 1: Tester Menu Flow Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Factory Service Tools

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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.

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