This article introduce the procedures of Techstream TIS ECU Flash Reprogramming.Flash reprogramming allows the ECU software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field-fix procedures described in individual Service Bulletins. This bulletin details the Techstream ECU flash reprogramming process and outlines use of the Technical Information System (TIS) and the Calibration Update Wizard (CUW). Flash calibration updates can only be applied to the vehicle/ECU combination for which they are intended. ECUs have internal security that will not allow them to be programmed with another ECU’s information.
PS:ECU Electronic Control Unit (ECU) is a Toyota term used to describe integrated computerized devices responsible for managing the operation of a system or subsystem. For the purposes of this bulletin, the term “ECU” is used as a generic label for the following SAE J1930 standard references:
1.Powertrain Control Module (PCM)
2.Engine Control Module (ECM)
3.Transmission Control Module (TCM)
4.Or any other Toyota specific control unit
What vehicle models this guide applicability:
Vehicle models:4Runner, Avalon, 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
Techstream ECU flash reprogramming is a 4-step process:
1.Verify the vehicle’s applicability for recalib ration and locate desired calibration file by performing the Techstream Health Check function.
Techstream will automatically search TIS for the appropriate Service Bulletin using the current Calibration ID from the vehicle.Calibration file links can be found embedded in the corresponding Service Bulletin.
2.Connect the GR8 Battery Diagnostic Stationusing “PowerSupplyMode”only. The GR8 Battery Diagnostic Station includes a Power Supply Mode to help maintain battery
voltage at 13.5 volts during ECU reprogramming.
ECU damage may occur if the correct battery charger mode setting is NOT used.
3.Locate appropriate calibration ID and reprogram the vehicle ECU withTechstream. Techstream uses the Calibration Update Wizard(CUW) application to open calibration files and facilitate the ECU flash reprogramming process.
4.Attach the Authorized Vehicle Modification Label.
Modifications to ECU calibrations MUST be recorded and properly displayed on the vehicle using the Authorized Modification Label
Techstream ECU Flashing Preparation:
Selecting the TIS Techstream VIM or the Mongoose MFC VIM.
Techstream software requiresa VIM selection before you can use the Mongoose MFC VIM.
If using TIS Techstream,no changes are needed.
Perform the following:
1.Select Setup from the Techstream Main Menu screen.
2.Select VIM Select from the Set up drop down menu
3.Select the correct Interface Set up from the drop down list.
If using Techstream Lite,select Mongoose MFC
Mongoose MFC Software and Driver MUST be installed before Mongoose MFC selection will be available.
See TIS–Diagnostics–Scan tool page for additional information
Select Mongoose MFC to Use Techstream Lite
If using TIS Techstream,select TIS Techstream VIM (this is the default)
Select TIS Techstream VIM (default )to Use TIS Techstream
Toyota Techstream TIS Reprogramming ECU Flash Procedures:
1 Verify the vehicle’s applicability for recalibration and locate desired calibration file.
A Connect Techstream and establish a vehicle connection.
B Click the Health Check button on the System Select tab
C Choose desired ECU group(s) in the Health Check dialog box
D Click Next.
E Click Continue to view Health Check result
F Available calibration updates are indicated by a Yes link in the Cal.Update? column.
Click the Yes link to acces sthe appropriate Service Bulletin onTIS
Note:any DTCs stored in systems that will be flash reprogrammed.
Clicking the Yes link will automatically launch TIS and perform a calibration search
G Login to TIS.(If already logged in,skip this step.)
H To review the Service Bulletin and access the calibration file,click the Service Bulletin link in
the Document Title column of the Calibration Search Result portlet.
NOTE:Only Toyota Certified Technicians and above may access calibration files
2 Connect the GR8 Battery Diagnostic Station.
A Connect the GR8 Battery Diagnostic Station to the vehicle and turn it ON.
B Select Power Supply Modeby following the screen flow below
ECU damage may occur if the correct battery charger and mode setting are NOT used.
Power Supply Mode is used 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
Instruction Manual located on TIS, Diagnostics–Tools & Equipment–Battery
Confirm Power Supply ModeIs Selecte
3.Click the appropriate calibration ID and reprogram the vehicle’s ECU with Techstream.
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
Calibration files are embedded as live links in the Service Bulletin.
Some vehicles require special preparation—please review the selected Service Bulletin carefully
B Click Open to load calibration file information.
Techstream pulls calibration files as needed to ensure the latest calibration file is used.
Do NOT save calibrations locally on the hard drive or other media.
Errors during the flash reprogramming process scan permanently damage the vehicle ECU.
Minimize the risk by following the steps below.
1.Battery voltage MUST NOT FALL BELOW 11.4 volts during reprogramming.Confirm battery voltage is higher than 11.4 volts,but be sure voltage DOES NOT RISE ABOVE 16.0 volts duringreprogramming.
2.Turn OFF all vehicle accessories(e.g.audio system,A/C,interior lights,DRL,etc.).Do NOT add to or significantly change thev ehicle’s electrical load while reprogramming.
3.Confirm the hood is open and ensure under hood temperature does NOT exceed158◦F(70◦C).
4.Confirm cable connections between the vehicle and Techstream are secure.
5.Do NOT disconnect or turn off Techstream or vehicle ignition during reprogramming.
6.Set parking brake.
7.Complete ALL flash calibration updates provided for each ECU.
8.If the battery’s state of charge or capacity are in question,test with SST.No. 00002-V8150-KIT “Digital Battery Analyzer,”and follow Service Bulletin No. PG001-06,“Battery Maintenance for In-Stock Vehicles & Pre-Delivery”,or the appropriate “Maintenance for HV & Auxiliary Batteries ”Service Bulletin.
9.The GR8Battery 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 Instruction Manual located on TIS, Diagnostics–Tools & Equipment–Battery Diagnostics
C Click Next to start the calibration update process
D When using TIS Techstream,select Techstream VIM as the desired programming device.
Then click Next
When using Techstream Lite,select Generic J2534 Interface.Then click Next
E Confirm the following:
•PC is connected to VIM.
•VIM is connected to DLC3 connector.
•Ignition is ON and engine is OF For “READY” OFF(hybrid vehicles).
Then click Next
F Verify correct current calibration and new calibration information.Thenc lick Next
•The total number of calibration IDs in the calibration file corresponds to the number of
reprogrammable processors in the ECU.
•Each calibration file may contain up to three separate calibrations.
•Below figure shows an example of the update procedure for a two-processor ECU
G Turn ignition OFF .Then click Next
H Confirm the following:
•Ignition is ON and engine is OFF or “READY” OFF (hybrid vehicles).
•Hood is open.
•All accessories are OFF .
•Battery voltage is above 11.4 volts.
Verify the vehicle is connected to a battery charger before continuing—If battery voltage falls below 11.4 volts,ECU damage may occur.
Then click Start
If key cycle is NOT done properly,reprogramming will stop at 10% and Cal1will fail to load
I Do NOT disturb the vehicle during flash reprogramming
•ECU flash reprogramming may take anywhere from 3–30 minutes per calibration file.
•Reprogramming time will vary depending on model and ECU communication protocol.
Vehicles using CAN communication protocol will reprogram much faster (2–7minutes)
•If vehicle requires only ONE calibration update,then proceed to step Ninthisbulletin.
•If vehicle requires a SECOND calibration update,then continue as follows:
•For serial communication vehicles,go to step J.
•For CAN communication vehicles,goto step L
J When Cal 1 has completed the update process,turn ignition OFF for a minimum of
10 seconds.Then click Next
K Turn ignition to the ON position.Then click Start
If key cycle is NOT done properly,reprogramming will stop at 10% and Cal 2 will fail to load
L Do NOT disturb the vehicle during flash reprogramming
M Turn ignition OFF for a minimum of 10 seconds.Then click Next
N Turn ignition to the ON position.Then click Next
O Confirm all calibrations were updated as specified in the Service Bulletin.Then click Finish
On some models,DTCs may set as a result of reprogramming.If DTCs are present,clear codes and run the Health Check again.Troubleshoot any remaining Current,Pending,or
History codes.Permanent codes will not be cleared using Techstream.Permanent codes do not illuminate the MIL and do not require troubleshooting.They will clear during normal
driving once the Universal Trip Drive Pattern is performed.
4 Attach the Authorized Modifications Label.
A Using a permanent marker or ballpointpen,complete the Authorized Modifications Label
and attach to the vehicle.The Authorized Modifications Lablis available through the MDC,
B Attach the label under the hood in the location determined by the specific Service Bulletin or Campaign
Wait 60–90 seconds for ink to set before handling