Harsh shift on hard acceleration.
Shift shock 1st to 2nd gear when the water temperature is below 60°C (140°F).
The Engine Control Module (ECM, SAE term: Powertrain Control Module/PCM) has been revised. Use the following Repair Procedure to address this condition.
More Lexus repair,please refer to:Lexus Trouble Repair
1.Does the vehicle exhibit one or more of the following conditions?
A.harsh shift on hard acceleration.
B.The vehicle has run out of fuel. After refueling, the vehicle does not creep, or has a delayed/harsh transmission engagement.
C.Shift shock 1st to 2nd gear when the water temperature is below 60°C (140°F).
2.Check for the Authorized Modifications Label affixed to the vehicle in the location shown below.
Confirm if the ECM (PCM) calibration has been updated.
Is the calibration ID listed NOT the latest ECM (PCM) calibration?
3.Flash reprogram the ECM (PCM).
The GR8 Battery Diagnostic Station MUST be used in Power Supply Mode to maintain battery voltage at 13.5 volts while flash reprogramming the vehicle.
For details on how to use the GR8 Battery Diagnostic Station, refer to the GR8 Battery
Diagnostic Station Instruction Manual located on the TIS library > Diagnostics > Tools and Equipment > Battery Diagnostics > GR8 Instruction Manual.
Follow the procedures outlined in TSB L-TCI-3746, “Techstream ECU Flash Reprogramming
4.Install the Authorized Modifications Label.
AUsing a permanent marker, enter the following information on the label:
BAffix the Authorized Modifications Label to the vehicle at the location shown in Figure 1. The Authorized Modifications Label is available through your facing PDC,
5.Perform transmission initialization.
Refer to the Technical Information System (TIS), applicable model and model year Repair Manual:
2016 – 2017 LX 570:
Drivetrain – Automatic Transmission/Transaxle – “AE80F Automatic Transmission/Transaxle:Automatic Transmission System: Initialization”
Initialization (Reset Memory) MUST be completed for proper vehicle operation.
6.Start the engine and warm it up to normal operating temperature and test drive to confirm proper vehicle operation.
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