Some 2008 – 2011 model year LX 570 vehicles may exhibit a MIL “ON” condition with transmission performance DTCs such as P2714, P0751, P0756, P0761, P0766, P0729, P0781, P0894, P2757, or P0776 and/or abnormal transmission shifting. Revised Engine Control Module/ECM (SAE term:Powertrain Control Module/PCM) software logic has been developed to address this condition. Insome cases, replacement of the automatic transmission may also be required.
NOTE
Confirm correct transmission fluid level by following the procedures in the Repair Manual BEFOREordering parts or reprogramming the ECM (PCM) since incorrect fluid level can also cause these DTCs.
APPLICABLE WARRANTY
Parts Information:
NOTE
Repair Procedure
1.Using Techstream, save Freeze Frame data, clear DTCs (if set), and perform a test drive.
Does the MIL “ON” reoccur with transmission performance DTCs resetting?
NOTE
Most transmission performance DTCs are two-trip detection logic DTCs.
Does the transmission display any transmission shifting issues?
2.Check the transmission for evidence of leakage, and address as necessary.
3.Check the transmission fluid level.
Refer to the Technical Information System (TIS), applicable model and model year Repair
Manual:
Drivetrain – Automatic Transmission/Transaxle – “AB60F Automatic Transmission/Transaxle:Automatic Transmission Fluid: Adjustment”
NOTE
Incorrectly adjusted fluid level can cause transmission shifting issues and MIL “ON” conditions.
Is the transmission fluid level correct?
Does the transmission fluid smell burnt or have a gritty feel from contamination?
NOTE
It is normal for WS transmission fluid to change from a clear red color when new to an opaque brown color with use.
5.Flash reprogram the ECM (PCM).
Check for the Authorized Modifications Label affixed to the vehicle in the location. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration, go to step B.
Flash reprogram the ECM (PCM).
NOTE
6.Install the Authorized Modifications Label.
A.Using a permanent marker, enter the following information on the label:
B.Affix the Authorized Modifications Label to the vehicle at the location.
The Authorized Modifications Label is available through the MDC, P/N 00451-00001-LBL.
7.Test drive the vehicle and perform transmission initialization.
Refer to TIS, applicable model and model year Repair Manual:
Drivetrain – Automatic Transmission/Transaxle – “AB60F Automatic Transmission/Transaxle:
Automatic Transmission System: Initialization”
Does the MIL “ON” reoccur with transmission performance DTCs resetting?
NOTE
Most transmission performance DTCs are two-trip detection logic DTCs.
Does the transmission display any transmission shifting issues?
8.Replace the transmission assembly.
9.Confirm the repair.
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