Canada - A/T - Torque Converter Flex Lock-Up Shudder

L-TCI-3152

June 5, 2012

FLEX LOCK-UP SHUDDER

Service Category
Drivetrain

Section
Automatic Transmission/Transaxle

Market
Canada





APPLICABILITY:

INTRODUCTION:

Some 2011 model year GS 350 and 2011 - 2012 model year IS 350/350C vehicles may exhibit an intermittent flex lock-up shudder when lightly accelerating between 40 - 80 km/h (25 - 50 mph). Follow the procedure in this bulletin to address this condition.

PRODUCTION CHANGE INFORMATION:





This TSB applies to vehicles produced BEFORE the Production Change Effective VIN shown.





WARRANTY INFORMATION:





PARTS INFORMATION:








REQUIRED TOOLS & EQUIPMENT:

REPAIR PROCEDURE:

1. Connect ETAS Techstream to the vehicle and perform Health Check. Confirm NO DTC(s) are stored in the ECT or ECM (SAE term: Powertrain Control Module/PCM).

Are there any DTC(s) present in the ECT or ECM (PCM)?

^ YES - This bulletin does NOT apply. Refer to the ETAS/TIS library and diagnose the DTC(s).

^ NO-Go to step 2.

2. Test drive the vehicle and confirm condition.





3. Remove the transmission main connector and the SLU negative terminal from the vehicle side connector to disable the torque converter lock up clutch. (See Figure 1.)

4. Wrap the SLU negative terminal end with electrical tape to protect the terminal.

5. Reinstall the transmission main connector.

NOTE

When the SLU negative terminal is removed DTC P2759 will set.

6. Test drive the vehicle.

Is the shudder condition present with the SLU negative terminal removed?

^ YES - This bulletin does NOT apply. Reinstall the SLU negative terminal, reconnect the transmission main connector, clear all DTCs, and continue diagnosis per the Repair Manual.

^ NO-Go to step 7.

7. Replace the torque converter.

Refer to the ETAS/TIS library, applicable model and model year Repair Manual:

2011 GS 350:

^ Drivetrain - Automatic Transmission/Transaxle - "A760E Automatic Transmission: Automatic Transmission Assembly: Removal / Installation"

^ Drivetrain - Automatic Transmission/Transaxle - "A760H Automatic Transmission: Automatic Transmission Assembly: Removal / Installation"

2011 - 2012 IS350:

^ Drivetrain - Automatic Transmission/Transaxle - "A760E Automatic Transmission: Automatic Transmission Assembly: Removal / Installation"

^ Drivetrain - Automatic Transmission/Transaxle - "A760H Automatic Transmission: Automatic Transmission Assembly: Removal / Installation"

2011 - 2012 IS350C:

^ Drivetrain - Automatic Transmission/Transaxle - "A 760E Automatic Transmission/Transaxle: Automatic Transmission Assembly: Removal / Installation"

8. Reinstall the SLU negative terminal in the transmission main connector and reconnect the connector.

9. Test drive the vehicle and confirm the shudder condition is eliminated.

NOTE:
Issue of the 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.

© 2012 Lexus, a division of Toyota Motor Sales, Canada