replacing the ECU. The following steps describe how to properly flash reprogram an ECU using the
Techstream diagnostic application and Calibration Update Wizard (CUW).
Camry, Camry HV,
Celica, Corolla, Echo,
FJ Cruiser, Highlander,
Highlander HV, Land
Cruiser, MR2 Spyder,
Matrix, Prius, Prius
C, Prius PHV, Prius
V, RAV4, Sequoia,
Sienna, Solara,
Tacoma, Tundra,
Venza, Yaris
ES350, GS F, GS200T,
GS300, GS350, GS430,
GS450H, GS460, GX460,
GX470, HS250H, IS F,
IS200T, IS250, IS250C,
IS300, IS350, IS350C,
LC500, LC500H, LFA,
LS430, LS460, LS500,
LS500H, LS600H, LX470,
LX570, NX200T, NX300,
NX300H, RC F, RC200T,
RC300, RC350, RX300,
RX330, RX350, RX400H,
RX450H, SC430
1. Verify the vehicle’s applicability for recalibration and locate desired calibration file.
Vehicle applicability can be determined by the following methods:
The GR8 battery charger includes a Power Supply Mode that maintains battery voltage at 13.5 volts during ECU reprogramming.
3. Locate appropriate calibration ID and reprogram the vehicle ECU with Techstream. Techstream uses the Calibration Update Wizard (CUW) application to open calibration files and facilitate the ECU flash reprogramming process.
4. Affix the Authorized Vehicle Modification Label.
Modifications to ECU calibrations MUST be recorded and properly displayed on the vehicle using the Authorized Modification Label
Perform the following:
1. Select Setup from the Techstream Main Menu screen.
A. ECU Reprogram Method:
a. Establish a vehicle connection.
b. Click the ECU Reprogramming button on the System Select tab
g. To access the calibration file, click the service bulletin link in the Document
Title column of the Calibration Search Result portlet
a. Establish a vehicle connection.
b. Click the Health Check button on the System Select tab
column. Click the Yes link to access the appropriate service bulletin on TIS
in the Document Title column of the Calibration Search Result portlet.
Only Lexus Senior, Master, and DS Technicians may access calibration files
B. Select Power Supply Mode by following the screen flow below
A. After reviewing the procedures outlined in the selected Service Bulletin, click the appropriate
calibration ID link by matching the vehicle’s current calibration ID to the Previous Calibration
ID in the Calibration Identification Chart.
• Some vehicles require special preparation — please review the selected Service
Bulletin carefully.
• PC is connected to VIM.
• VIM is connected to DLC3 connector.
• Ignition is ON and engine is OFF or “READY” OFF (hybrid vehicles)
Press File Open button to open calibration file
Select correct J2534 device tool
reprogrammable processors in the ECU.
• Each calibration file may contain up to three separate calibrations.
Turn ignition OFF
Press Next
Confirm the following conditions:
1. Turn ignition ON
2. Engine hood open
3. All eletrical accessories are OFF
4. Battery voltage above 11.8V
• Reprogramming time will vary depending on model and ECU communication protocol.
Vehicles using CAN communication protocol will reprogram much faster (2 – 7
minutes).
• If vehicle requires a SECOND calibration update, then continue as follows:
• For serial communication vehicles, go to step J.
• For CAN communication vehicles, go to step L.
Turn ignition OFF
Press Next
10 seconds.
Some DTCs may have been set during the reprogramming process. Clear all DTCs with Techstream software
after restoring vehicle.
A. Using a permanent marker or ball point pen, complete the Authorized Modifications Label
and attach to the vehicle. The Authorized Modifications Label is available through the MDC,
P/N 00451-00001-LBL.
or Campaign.
Wait 60 – 90 seconds for ink to set before handling.