Figure 8.

F. Log in to TIS. (If already logged in, skip this step.)
G. 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.

Figure 9.

NOTE
ONLY Lexus Certified Technicians and
other authorized users may access
calibration files.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Page 8 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

2. Connect the DCA-8000 battery diagnostic tool.
NOTE
Refer to Vehicle Reprogramming Tips for other approved chargers, located at TIS –Diagnostics –
Reprogramming – Reference Documents.

A. Connect the DCA-8000 battery diagnostic tool to the vehicle and turn it ON.
B. Select Power Supply Mode.
NOTICE
 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 13.5V while flash
reprogramming the vehicle.
 For details on how to use the DCA-8000 battery diagnostic tool, refer to the
DCA-8000 Instruction Manual located at TIS – Diagnostics – Tools & Equipment –
Battery Diagnostics.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Page 9 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

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.
NOTE
 Calibration files are embedded as live links in the Service Bulletin.
 Some vehicles require special preparation. Review the selected Service Bulletin carefully.
Figure 10.

B. Click Open to load the calibration
file information.

Figure 11.

NOTE
Techstream downloads calibration files as
needed to ensure the latest calibration file
is used. Do NOT save calibrations locally
on the hard drive or other media.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Page 10 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

NOTICE
Errors during the flash reprogramming process can permanently damage the vehicle ECU.
Minimize the risk by following the steps below.
 Battery voltage MUST NOT FALL BELOW 11.8V during reprogramming. Confirm battery
voltage is higher than 11.8V, but be sure voltage DOES NOT RISE ABOVE 16.0V
during reprogramming.
 Turn OFF ALL vehicle accessories (audio system, A/C, interior lights, DRL, etc.).
Do NOT add to or significantly change the vehicle’s electrical load while reprogramming.
 Confirm the hood is open and ensure under-hood temperature does NOT exceed 158°F (70°C).
 Confirm cable connections between the vehicle and Techstream are secure.
 Do NOT disconnect or turn off Techstream or vehicle ignition during reprogramming.
 Set parking brake.
 Complete ALL flash calibration updates provided for each ECU.
 If the battery’s State-Of-Charge (SOC) or capacity is in question, test with
SST No. DSS-5000P T (Battery Diagnostic Tool), and follow the DSS-5000 Instruction Manual
located at TIS – Diagnostics – Tools & Equipment – Battery Diagnostics.
 The DCA-8000 battery diagnostic tool MUST be used in Power Supply Mode to maintain battery
voltage at 13.5V while flash reprogramming the vehicle.
For details on how to use the DCA-8000 battery diagnostic tool, refer to the
DCA-8000 Instruction Manual located at TIS – Diagnostics – Tools & Equipment –
Battery Diagnostics.

C. Click Next to start the calibration
update process.

Figure 12.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Page 11 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

D. Confirm the following:
 PC is connected to VIM
 VIM is connected to DLC3 connector
 Ignition is ON and engine is OFF or “READY” OFF (hybrid vehicles)
Then, click Next.
Figure 13. Using Techstream 2.0 or Techstream Lite

1

1

Select Correct Device Tool (“Mongoose MFC,” “MongoosePro MFC,” or “MongoosePro MFC2” [green])

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

E. Verify correct current and NEW
calibration information, then click Next.

Figure 14.

NOTICE
 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.
 Figure 15 shows an example of
the update procedure for a
two-processor ECU.

F. Turn ignition OFF, then click Next.

Figure 15.

© 2019 Lexus, a division of Toyota Motor Sales, USA

Page 12 of 16

L-SB-0001-18

Rev1

January 22, 2018

Page 13 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

G. Confirm the following:

Figure 16.

 PC is connected to VIM
 Ignition is ON and engine is OFF or
“READY” OFF (hybrid vehicles)
 Hood is open
 ALL accessories are OFF
 Battery voltage is above 11.8V
NOTICE
Verify the vehicle is connected to a
battery charger before continuing.
If battery voltage falls below 11.8V,
ECU damage may occur.

Then, click Start.
NOTE
If the key cycle is NOT done properly, reprogramming will stop at 10% and Cal 1 will fail to load.

Do NOT disturb the vehicle during flash
reprogramming.

Figure 17.

NOTE
 ECU flash reprogramming may take
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 – 7 minutes).

Does the vehicle require only ONE calibration update?
 YES — Go to substep M.


NO — If the vehicle requires a SECOND calibration update, continue as follows:
 For serial communication vehicles, continue to substep H.
 For CAN communication vehicles, go to substep J.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

H. When Cal 1 completes the update
process, turn the ignition OFF for
a minimum of 10 seconds, then
click Next.

Figure 18.

I.

Figure 19.

Turn the ignition to the ON position,
then click Start.
NOTE
If the key cycle is NOT done properly,
reprogramming will stop at 10% and Cal 2
will fail to load.

J. Do NOT disturb the vehicle during flash
reprogramming.

Figure 20.

© 2019 Lexus, a division of Toyota Motor Sales, USA

Page 14 of 16

L-SB-0001-18

Rev1

January 22, 2018

Page 15 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

K. Turn the ignition OFF for a minimum of
10 seconds, then click Next.

Figure 21.

L. Turn the ignition to the ON position,
then click Next.

Figure 22.

M. Confirm ALL calibrations were updated
as specified in the Service Bulletin, then
click Finish.

Figure 23.

NOTE
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.

© 2019 Lexus, a division of Toyota Motor Sales, USA

L-SB-0001-18

Rev1

January 22, 2018

Page 16 of 16

Techstream ECU Flash Reprogramming Procedure
Operation Procedure (continued)

4. Attach the Authorized Modifications Label.
A. Using a permanent marker or ballpoint pen, complete the Authorized Modifications Label
and attach it to the vehicle. The Authorized Modifications Label is available through the
MDC, P/N 00451-00001-LBL.
Figure 24.

1

Replacement ECU Part Num ber

4

Date Com pleted

2

Calibration ID(s)

5

Service Bulletin or Campaign Num ber

3

Dealer Code

B. Attach the Authorized Modifications Label under the hood in the location determined by
the specific Service Bulletin or Campaign.
NOTE
Wait 60 – 90 seconds for ink to set before handling.

© 2019 Lexus, a division of Toyota Motor Sales, USA